Articles about Optics and Photonics, Lasers, Fiber Bragg gratings and FBG sensors

What Laser to Choose for Your Laser Marking Application?

on September 13, 2018

What Laser to Choose for Your Laser Application?How to make the right decision when choosing the best laser for a marking application? An understanding of the laser characteristics and the material properties is essential to making an optimal choice. In laser marking processes, the type of material, quality of mark required, and speed will all play a role in the optimum choice of a laser.

There are several technology options when choosing a pulsed laser for marking:

  • Nd: YAG

The Nd: YAG laser was introduced more than 25 years ago and is the workhorse of the industry. One advantage of Nd: YAG lasers are their high beam quality, which leads to a smaller spot size of the laser: the small spot size, along with short pulses, produces high peak power that can be beneficial in deep engraving with crisp, clear marks and small characters.

  • Nd: YVO4 (vanadate)

The vanadate laser can emit at three different wavelengths: 1064, 532 (green), and 355 (blue) nm. Such lasers deliver high beam quality with pulse-to-pulse stability too. It makes them well suited for ablation marking and heat-affected zone (HAZ) applications.

Fiber lasers do not have the same beam quality as Nd: YAG or vanadate lasers, which limits the amount of peak power available. The fiber laser can anneal stainless steel due to its long pulse width and larger spot size, putting more heat in the part to draw the carbon to the surface. Not so many fiber laser manufacturers offer the laser source to a third party for integration into a marking system.

One major benefit of ytterbium-doped fiber lasers is that the near-infrared 1070 nm wavelength emitted is dose enough to the 1064 nm wavelength of neodymium-doped Yttrium aluminum garnet (Nd: YAG) lasers as to make no difference during the actual process of laser marking. This made for a relatively easy replacement of continuous wave Nd: YAG lasers by fiber lasers for most marking applications.

It is also important to understand how the material to be marked absorbs laser light at the wavelength of the laser chosen. Ferrous and non-ferrous materials have excellent absorption at 1064 nm, while precious metals do so at 355 and 532 nm. Plastics also absorb the higher wavelength laser output. In terms of operating costs and consumables, these three laser systems are almost identical, so an end user can choose the optimum laser technology without having to make cost tradeoffs.

The most common terms used in laser marking include engraving, annealing, ablation, and color change of plastics.

All three laser technologies will have a place in industrial manufacturing for years to come. The technology will continue to evolve in order to meet the changing demands of the manufacturing environment.

Optromix Inc., headquartered in Cambridge, MA, USA, is a manufacturer of laser technologies, optical fiber sensors, and optical monitoring systems. We develop and manufacture a broad variety of fiber lasers, СО₂ lasers, Ti: Sapphire lasers, dye lasers, and excimer lasers. We offer simple erbium laser and ytterbium laser products, as well as sophisticated laser systems with unique characteristics, based on the client’s inquiry.

We manufacture lasers using our own technologies based on the advanced research work and patents of international R&D team. Laser processes are of high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility.

If you are interested in Optromix fiber laser systems, please contact us at info@optromix.com

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editorWhat Laser to Choose for Your Laser Marking Application?

Visible Fiber Lasers Range Expands

on September 4, 2018

Over the past decade, visible-wavelength fiber lasers (often called visible fiber lasers) established their presence in the commercial laser arena. The term visible lasers is used to denote lasers emitting visible light, or sometimes laser systems or devices generating visible light via nonlinear frequency conversion. In other words, visible light can be obtained from a near-infrared-emitting by external frequency conversion: for instance, Raman-shifting, frequency-doubling, frequency sum-mixing, or combinations of these approaches. Visible fiber lasers have uses ranging from science, industry (especially material processing) to general laser use.

Visible Fiber Lasers Range ExpandsThe origins of visible fiber lasers are as varied as the companies that produce these devices. For example, MPB Communications supplies Raman amplification subsystems to the fiber optic communications industry. MPBC launched the first visible fiber laser at a 560 nm wavelength at SPIE Photonics West in 2006. The laser was soon adopted for flow-cytometry applications at NIH National Cancer Institute (Bethesda, MD). Nowadays MPBC produces visible-wavelength fiber lasers and based on them scientific laser systems with 26 commercial wavelengths from 488 to 755 nm and with powers ranging from 0.2 to 5W, depending on the application needs.

Azurlight Systems (Pessac, France) designs and manufacturers visible-wavelength fiber lasers by frequency-doubling fundamental IR fiber lasers. Specific specialty fibers have been developed that have explained ytterbium (Yb) gain bandwidth down to 976 nm (1030 nm being the traditional lower limit). This has enabled the company to open up visible-wavelength average into the blue region of the optical spectrum.

Visible fiber lasers are an advantage for the material processing that has a higher absorptance in the visible than in the IR. Some metals, such as copper and gold, have an absorptance several times higher in the green than at the fundamental IR wavelength. Copper, in particular, is widely used in electronics.

Visible-wavelength fiber lasers and laser systems are used for various applications, including cinema projection, displays, material processing, and biophotonics. In scientific laser systems such as atom trapping, atomic clocks, sodium guide stars, and quantum optics, it is common that an exact wavelength with extremely narrow linewidth is required. High-power laser sources based on amplified single-frequency sources such as DFB laser or distributed Bragg reflector (DBR) fiber laser. Future development of frequency-converted fiber lasers will require that development of nonlinear materials “catch up” with the progress in fiber lasers. While fiber lasers are already generating kilowatt-level powers, few nonlinear materials are currently able to handle hundreds of watts of visible and infrared power.

Optromix has a line of tunable fiber lasers that includes a single-mode CW visible fiber lasers tunable over a wide range in the green (515-562 nm). The linewidth of the laser can be tailored by the company for the user from options of 0.01, 0.05, 0.1, and 0,3 nm. Applications include biotechnology, spectroscopy, and holography.

Optromix Inc., headquartered in Cambridge, MA, USA, is a manufacturer of laser technologies, optical fiber sensors, and optical monitoring systems.

We develop and manufacture a broad variety of fiber lasers, СО₂ lasers, Ti: Sapphire lasers, dye lasers, and excimer lasers. We offer simple erbium laser and ytterbium laser products, as well as sophisticated laser systems with unique characteristics, based on the client’s inquiry.

We manufacture lasers using our own technologies based on the advanced research work and patents of international R&D team. Laser processes are high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility.

If you are interested in Optromix fiber lasers, please contact us at info@optromix.com

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editorVisible Fiber Lasers Range Expands

CO₂ Lasers: Application-Specific Era

on September 2, 2018

Hundreds of thousands of CO₂ fiber lasers have already been used in medicine, manufacturing, and different scientific lasers systems and studies: from printing a four-digit code on water bottles in a high-speed manufacturing line in China to welding component parts for Mercedes-Benz automobiles in Germany. Carbon dioxide (CO₂) fiber lasers are an ancient technology by photonics standards, but CO₂ laser systems have survived and thrived because of their unique combination of wavelength, power, and spectral purity. Nowadays CO₂ fiber lasers are progressing to an application-specific marketplace wherein extreme high peak power, wavelength specificity, and operational stability.

A typical CO₂ laser consists of a volume of electric discharge with a gas mixture that includes CO₂ molecules. The energy levels of molecular vibration and rotation are close together, photons emitted as a result of transitions between these levels are low in energy and long in wavelength compared to visible and near-infrared (NIR) light.

Carbon dioxide lasers can provide power levels from milliwatts to tens of kilowatts, making them equally suited to instrumentation or brute-force cutting. Plus CO₂ lasers have high spectral purity: with <1kHz of radiated linewidth without a power tradeoff, conversion efficiencies of 10% are possible. So CO₂ lasers emerge applications in material processing, light detection and ranging (LIDAR), thermal vision assistance, and targeted therapeutic medical applications.

CO₂ lasers have been identified as the optimal tool to generate extreme ultraviolet (EUV) radiation through laser-produced plasma (LPP). This EUV light at 13.5 nm is produced by vaporizing molten droplets of tin. The aforementioned lasers generate optically thin plumes with high velocities and good plasma properties because of tin’s much higher reflectivity to CO₂ laser illumination.

CO₂ Lasers: Application-Specific EraIn addition to this, scientists discovered that human hard tissues (bones and teeth) have strong absorption in the 9.3-9.6 μ range. Studies have both hard and soft tissue, and for preventing dental caries (tooth decay).

Modern CO₂ lasers can achieve kilowatt peak powers without external modulation in a small form factor.

We believe in developing a real sense of partnership with our customers. We are committed to understanding our customer’s needs and providing them with a broad variety of fiber lasers, СО₂ lasers, Ti: Sapphire lasers, dye lasers, and excimer lasers. We offer simple erbium fiber lasers and ytterbium fiber lasers, as well as sophisticated laser systems with unique characteristics, based on the client’s inquiry. We manufacture lasers using our own technologies based on the advanced research work and patents of international R&D team. Laser processes are of high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility.

If you are interested in Optromix CO₂ lasers, please contact us at info@optromix.com

 

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editorCO₂ Lasers: Application-Specific Era

Excimer Laser Treatment of Corneal Surface Pathology

on August 25, 2018

Excimer Laser Treatment of Corneal Surface PathologyAn excimer laser is an effective tool for treating corneal pathology. When such fiber laser is used to treat anterior corneal pathology, the treatment is termed phototherapeutic keratectomy (PTK).

The excimer fiber laser is a powerful kind of laser which is nearly always operated in the ultraviolet (UV) spectral region and generates nanosecond pulses. Different types of excimer ultraviolet fiber lasers typically emit at wavelengths between 157 and 351 nm.

The excimer laser has two unique properties that make it a terrific tool for corneal pathology:

  1. the ability to create a smooth corneal surface
  2. the ability to provide excellent epithelial adhesion

There are three primary treatment categories of PTK:

  1. corneal opacity

The main goal of PTK in the corneal opacity group is to increase transmission of light through the cornea. In other words, the pathology portion of the cornea is cut off using the excimer fiber laser, thus allowing a clearer image. The first category also includes patients with corneal scars from previous infections or trauma. In evaluating a patient with a corneal opacity for PTK, three criteria should be considered:

  • the depth of the opacity
  • the location of the opacity
  • the refractive error
  1. surface irregularity

The goal of PTK for the second category is to improve the corneal topography.

  1. epithelial breakdown

The goal of PTK for recurrent epithelial breakdown conditions is to improve comfort.

The ideal patient for PTK has an elevated corneal scar, a homogenous anterior stromal scar, and pathology limited to the anterior 100 μm of the cornea. Patients not treatable with PTK include those with significant loss of corneal tissue or scars beyond 100 μm on the cornea, as well individuals with extreme corneal thinning and active inflammation, such as ongoing keratitis.

The surgical technique, of course, involves a polishing motion, However, it should be noted, different conditions such as elevated scars and recurrent erosion, require a separate surgical technique. So an elevated scar must firstly be mechanically removed using forceps. After the majority of the scar has been removed, 5% methylcellulose solution is applied to the corneal surface. Then a circular motion of the excimer fiber laser is used, and little scar tissue remaining.

PTK is proving to be a terrific procedure in anterior corneal pathology. It has, in many cases, delayed or even prevented the need for a corneal transplant. Nowadays it is obvious that PTK is a very good minimally invasive technique to improve vision in eyes with anterior stromal corneal dystrophies.

Optromix Inc., headquartered in Cambridge, MA, USA, is a manufacturer of laser technologies, optical fiber sensors, and optical monitoring systems. Optromix provides world-class laser systems and it is our highest priority to deliver the best quality products to our clients.

If you are interested in any fiber laser systems, please contact us at info@optromix.com

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editorExcimer Laser Treatment of Corneal Surface Pathology

What Are Rare-Earth Doped Fibers and Why They Are Needed?

on August 17, 2018

What Are Rare-Earth Doped Fibers and Why They Are Needed?Typical fiber lasers and fiber amplifiers are often based on glass fibers which are doped with laser-active rare ions (normally only in the fiber core).  Such ions absorb pump light, typically at a shorter wavelength than the laser or amplifier wavelength (except in upconversion lasers). It excites them into some metastable levels. In other words, rare-earth doped fiber is an optical fiber in which ions of a rare-earth element, such as neodymium, erbium or holmium, have been incorporated into the glass core matrix, yielding high absorption with low loss in the visible and near-infrared spectral regions.

Rare elements are a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium. Scandium and yttrium are considered rare earth elements since they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties. China became the world’s dominant producer of rare earths in the 1990s. By the beginning of the twentieth century, China accounted for more than 95% of world rare earth production because China sold rare earths at very low prices, mines like Molycorp’s Mountain Pass in California and others throughout the world were unable to compete. China is also the dominant consumer of rare earths, which they use mainly. In the manufacture of electronic products for domestic use as well as export. Japan and the United States are the world’s second and third largest consumers of rare elements.

Rare earth ions are good candidates for active ions in laser materials because they show many absorption and fluorescence transitions in almost every region of the visible and the near-infrared range. The technologically most important rare-earth-doped fibers for erbium-doped fiber amplifiers and ytterbium-doped fibers for high-power fiber lasers and amplifiers.

The glass host composition affects the solubility of the rare earth dopant which, in turn, may affect the fluorescence lifetime, absorption. emission, and excited state absorption cross sections of the dopant transitions. These quantities affect the cultivated ability of the active material to provide gain.

For all designs, the rare earth should ideally be confined as a delta function in the center of the core for maximum gain per unit pump power. Practically, there is a necessary tradeoff between the confinement and the rare earth concentration.

We believe in developing a real sense of partnership with our customers. We are committed to understanding our customer’s needs and providing them with a broad variety of fiber lasers, СО 2 lasers, Ti: Sapphire lasers, dye lasers, and excimer lasers. We offer simple erbium fiber lasers and ytterbium fiber lasers, as well as sophisticated laser systems with unique characteristics, based on the client’s inquiry. We manufacture lasers using our own technologies based on the advanced research work and patents of international R&D team. Laser processes are of high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility.

If you are interested in Optromix fiber laser systems, please contact us at info@optromix.com

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editorWhat Are Rare-Earth Doped Fibers and Why They Are Needed?

Fiber Lasers Used in Self-Driving Cars

on August 11, 2018

LiDAR (Light Detection and Ranging) is a remote sensing method used to examine the surface of the Earth. In other words, such method uses light in the form of a pulsed fiber laser to measure ranges (variable distances) to the Earth. A LiDAR instrument principally consists of a fiber laser, a scanner, and a specialized GPS receiver. Airplanes and helicopters are the most commonly used platforms for acquiring LiDAR data over broad areas. LiDAR systems allow scientists and mapping professionals to examine both natural and manmade environments with accuracy, precision, and flexibility.

The self-driving car has several sensors that detect obstacles and map its environment. The LiDAR is most like human eye in its function amongst all of these types of sensors.

LiDAR systems illuminate the target area with a pulsed fiber laser signal and calculate the time it takes for the reflected signal to be returned to the receiver. In more detail, such laser systems comprise of a laser source, a photodetector, data processing electronics, and motion-control fiber optic equipment.

The laser source in the LiDAR is the most critical for performance. The high beam quality of the fiber laser and its divergence are crucial for high lateral resolution. A short laser pulse duration and low timing jitter ensure good longitudinal accuracy. Pulse energy is a key to attaining long-range detection, while high pulse repetition rates allow faster scanning leading to a higher data throughput.

Laser diodes and fiber lasers are both commonly used sources in LiDAR systems. Laser diode sources are usually vertically stacked, meaning the incoherent addition between the layers in the stack often leads to layer powers exceeding that of class 1 eye-safe laser. Fiber lasers, on the other hand, offer high pulse-repetition rates of 5 kHz at power levels of 10 W to 250 kHz at power levels of 300 W.

The ideal LiDAR system must contain a laser source at an eye-safe wavelength with sufficient power to detect dark obstacles at a distance of 100 m with 10 cm accuracy, and temperatures between – 40 C to 85 C.Fiber Laser Used in Self-Driving Cars

Optromix is a worldwide fiber laser vendor. Our team manufacture lasers using our own technologies based on the advanced research work and patents of international R&D team. Laser processes are of high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility. The lasers that we manufacture can be used for a variety of applications, including LIDAR systems.

If you are interested in different types of fiber lasers, please contact us at info@optromix.com

 

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editorFiber Lasers Used in Self-Driving Cars

Continuous Wave (CW) Lasers and Their Applications

on July 17, 2018

There are three main categories of fiber lasers: continuous wave (CW) lasers, pulsed fiber lasers, and ultrafast lasers. Continuous wave lasers produce a continuous, uninterrupted beam of light, ideally with a very stable output power. The exact wavelengths or lines at which this occurs is determined by the characteristics of the laser medium. Each laser wavelength is connected with a linewidth, which depends on several factors: the gain bandwidth of the lasing medium and the design of the optical resonator, which may include elements to purposely narrow the linewidth, like filters or etalons.

The fiber laser has many important advantages by itself:

  • the output is naturally fiber-delivered, which makes it easy to couple into many laser machine tools and to integrate the easier with robotic delivery systems
  • fiber laser high beam quality is suitable to couple it into small fibers, allowing the beam to be focused to small spots in order to obtain the high power densities required for metal welding, cutting, and other industrial processes
  • fiber laser architecture lends itself to power scaling
  • such fiber lasers have high wall plug efficiency in comparison to CO2 and solid-state lasers, it can also have low maintenance requirements; this lowers the cost of ownership.

Must applications of continuous wave lasers require that the power be as stable as possible over long time periods, as well as over short time durations, depending on the specific applications. To ensure this stability also in the presence of varying environmental situations like temperature, vibrations, and the aging of the laser itself, microprocessor control loops are implemented.

Continuous Wave (CW) Lasers and Their ApplicationsContinuous wave lasers can be useful for a wide range of applications. Such fiber lasers and laser systems based on them are most often and for laser cutting, welding, and drilling tasks, which in itself see uses across dozens of industries. Continuous wave lasers are used in the aerospace and automotive industries to help cut, drill, and well anything from tiny thru-holes that keep engine parts cool, all the way up to cutting huge sheets of metal that form part of the vehicle or aircraft’s final structure. Such fiber lasers are most commonly used for industrial application, the majority of which involve metal in some form, continuous wave lasers find a high prevalence in being used to out, drill, and well metal. In addition to this, this type of the fiber laser is effective in being used upon a wide range of metals, including, but not limited to: steel, brass, nickel, aluminium, tungsten, and suchlike. Moreover, continuous wave lasers are excellent at working with reflective metals too. Such fiber lasers are actively used, additionally, in the medical sector, and it’s not only technologies that these machines are used for, these fiber lasers and laser systems are also used on people too. Powerful continuous wave is being used in trials by oil drilling companies to soften rock to extend the life of drilling heads.

Optromix Inc., headquartered in Cambridge, MA, USA, is a manufacturer of laser technologies, optical fiber sensors, and optical monitoring systems. We manufacture lasers using our own technologies based on the advanced research work and patents of international R&D team. Laser processes are of high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility. If you have any questions about continuous wave lasers please contact us at info@optromix.com

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editorContinuous Wave (CW) Lasers and Their Applications

Fiber Optic Products for Spacecraft Applications

on June 25, 2018

For the successful operation of any space mission, spacecraft monitoring is crucial. A variety of sensors are required to provide important information about the spacecraft health during fabrication, testing, and service lifetime. we have a lot to thank optical scientific instruments for ground-breaking climate research, satellites for observational systems, non-invasive medical research, and semiconductor production. Space is a challenging environment for any sensing system as it is characterized by microgravity, vacuum, the presence of radiation (protons, electrons, heavy ions, etc.), large thermal variations, mechanical vibrations and shock resulting from the launch. The specifications of sensors are derived by the type of mission primarily defined by the orbital altitude, the operational lifetime, and the location of the sensor in the spacecraft.

Fiber optic systems are considered for spacecraft applications due to many advantages such as intensivity to electromagnetic interference, freedom from sparking electrostatic discharge, low weight, and flexible harness. The European Space Agency (ESA) has been investigating fiber optic products for several years: the first operational space flight demonstrations are under development.

the potential for the introduction and development of fiber optic systems is characteristics of diverse spacecraft operations: in satellites, launchers, atmospheric entry vehicles, in ground testing of space structures, solar sails, and on board the international space stations.

Nowadays fiber optic systems based on different fiber optic products have reached a level of maturity and reliability so they can be seriously considered for spacecraft applications. Currently, fbg sensor systems have been successfully used in several acoustic and vibro-acoustic qualification tests. The performance of the fbg sensor systems has equaled or exceeded that of traditional sensors. The most significant advantages are:

  • The immunity to electromagnetic interference;Fiber Optic Products for Spacecraft Applications
  • The ability to multiplex a large number of fbg strain sensors along an optical fiber and individually interrogate them through a simple fiber;
  • The unmatched capability for making absolute strain measurements without constant monitoring;
  • Low weight;
  • Small size.

Optromix, Inc. is a U.S. manufacturer of innovative fiber optic products for global market, based in Cambridge, MA. Our team always strives to provide the most technologically advanced fiber optic solutions for our clients. Our main goal is to deliver the best quality fiber optic products to our clients. We produce a wide range of fiber optic devices, including our cutting-edge customized fiber optic Bragg grating product line and fiber Bragg grating sensor systems. Optromix, Inc. is a top choice among the manufacturers of fiber Bragg grating monitoring systems. If you have any questions, please contact us at info@optromix.com

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Single Frequency Lasers Tutorial

on June 15, 2018

Single Frequency Lasers TutorialThe single frequency fiber laser operates on a single resonator mode so that it emits quasi-monochromatic radiation with a very small linewidth and low phase noise. In addition to this, fiber lasers of this type have the potential to have very low-intensity noise. Single frequency fiber lasers can be very sensitive to optical feedback, therefore such fiber lasers have to be carefully protected against any back-reflections, often using one or two Faraday isolators. There are five types of single frequency lasers:

  • Some low-power laser diodes, in particular, index-guided types, usually emit on a single mode. The stable single-mode operation is often achieved with DFB (Distributed Feedback) lasers or DBR (Distributed Bragg Reflector) lasers;
  • Special kinds of fiber lasers allow for single frequency operation. Some of these are based on unidirectional ring laser designs, others have linear resonators and very short (highly doped) fibers. In any case, at least one fiber Bragg grating is usually used;
  • Diode-pumped solid-state bulk lasers can be forced to operate on a single mode. Output powers can reach the multi-watt level, and the linewidth can be low as a few kilohertz;
  • Vertical cavity surface-emitting lasers have very short monolithic laser resonators, thus huge cavity mode spacings, and easily emit a few milliwatts on a single mode.
  • A helium-neon laser can easily emit a single frequency if its laser resonator is made short enough (of the order of 20 cm) because the gain bandwidth is small.

Optromix develops and manufactures a broad variety of fiber lasers, СО2 lasers, ti: sapphire lasers, dye lasers, and excimer lasers. We offer simple erbium laser and ytterbium laser products, as well as sophisticated laser systems with unique characteristics, based on the client’s inquiry. Our femtosecond fiber lasers and picosecond fiber lasers offer a vast range of applications and can be used in different research fields.

If you are interested in Optromix single frequency fiber lasers, please contact us at info@optromix.com

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editorSingle Frequency Lasers Tutorial

Distributed feedback lasers provide a number of advantages and the largest variety of wavelengths available on the market

on June 1, 2018

Distributed feedback (DFB) lasers are considered promising light-source candidates for coherent optical transmissions over a long-distance. Dfb lasers are lasers where the whole resonator consists of periodic structure, which acts as a distributed reflector in the wavelength range of laser action and contains a gain medium. Typically, the periodic structure is made with a phase shift in its middle. This structure is essentially the direct concatenation of two fiber Bragg gratings with optical gain within the gratings. Due to the large free spectral range, wavelength tuning without mode hops may be possible over a range of several nanometers. However, the tuning range may not be as large as for a distributed Bragg reflector laser. Most dfb lasers are either fiber lasers or semiconductor lasers, operating on a single resonator mode. In the case of a fiber laser, the distributed reflection occurs in a fiber Bragg grating, typically with a length of a few millimeters or centimeters. Such dfb lasers are very simple and compact. Their compactness and robustness also lead to a low intensity and phase noise level. Semiconductor dfb lasers can be built with an integrated grating structure. Such dfb lasers are available for emission in different spectral regions at least in the range from 0,8 μm to 2,8 μm. Typical output powers are some tens of milliwatts.

Dfb lasers are characterized by temperature stability of the oscillation frequency, which is uniquely determined by the optical lattice period. The temperature dependence coefficient of the emission wavelength in a typical dfb laser is 0,1 nm/deg; it is determined by the temperature dependence of the refractive index. Such simplicity of design is a very significant advantage of tunable dfb lasers. However, the biggest disadvantage of dfb lasers is the limited frequency tuning range.

If you wish to send lots of different wavelengths down the same optical fiber in a wavelength-division multiplexed system, then any stray wavelengths can cause problems by interfering with other signals. What you therefore need is a laser that will emit almost entirely at one wavelength, you need a dfb laser. Dfb lasers are naturally more expensive due to the extra complexity of this grating being added to the semiconductor lasers. In fact, the dfb laser may be up to 1000 times more expensive than a basic Fabry-Perot laser. However, in modern optical networks, the improved performance makes dfb lasers well worth the extra money.

Optromix Inc., headquartered in Cambridge, MA, USA, is a manufacturer of laser technologies, optical fiber sensors, and optical monitoring systems.

We develop and manufacture a broad variety of fiber lasers, СО 2 lasers, Ti: Sapphire lasers, dye lasers, and excimer lasers. We offer simple erbium laser and ytterbium laser products, as well as sophisticated laser systems with unique characteristics, based on the client’s inquiry.

We manufacture lasers using our own technologies based on the advanced research work and patents of internatioDistributed feedback lasers provide a number of advantages and the largest variety of wavelengths available on the marketnal R&D team. Laser processes are high quality, high precision, easily-automated manufacturing solutions that provide repeatability and flexibility.

If you are interested in Optromix fiber lasers, please contact us at info@optromix.com

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editorDistributed feedback lasers provide a number of advantages and the largest variety of wavelengths available on the market