The laser cavity is formed by the high reflector and output coupler mirrors. This paper summarizes recent achievements in the area of development and fabrication of highpower passive. Basics and features of highpower fiber laser semantic scholar. H igh power fiber lasers can be incoherently combined to form the basis of a highenergy laser system for directedenergy applications. Indeed, fiber lasers with multimode outputs have produced even higher cw powers. High power fiber lasers have found a multitude of applications in industry thanks to their superior properties, such as exceptional high beam quality and stability, extreme power scalability. Latest development of high power fiber lasers in spi. Lasers are used in a wide range of applications that benefit from the pinsharp spatially coherent beam and immense pulse peak power they can provide. Very high melting temperature and mechanical strength relatively simple and wellestablished techniques for fiber fabrication very low loss good handling properties e. The main technology for high power fiber lasers, including laser diode beam shaping, fiber laser pumping techniques, and amplification systems, are discussed in detail. Subsequently, nddoped fiber lasers were developed following the progress in bulk glasses. This development is fueled simultaneously by industrial and defense applications.
Yls high power fiber lasers power levels from 1kilowatt to 100 kilowatts single mode to 3 kilowatts available low order mode to 50kw water cooled industrial interface. Highpower passive fiber components for allfiber lasers and. The pump light is launched into an inner cladding rather than into the much smaller fiber core, in which the laser light is generated. Highpower fiber lasers occupy probably the most challenging and demanding place in the whole field of fiber laser technology.
Special attention is placed on pump combination techniques and the parameters that affect the brightness enhancement observed in singlemode and multimode. Highpower singlefrequency fiber lasers by weihua guan submitted in partial ful. Our standard high power fiber offering is detailed below and on the accompanying spec sheets. Fiber optics for highpower applications features feb.
Fiber lasers typically require less power to maintain high beam quality and are more compact than other hel designs. In this paper, we compare the measurements taken with ybdoped fiber lasers at power levels ranging from a few watts to hundreds of watts with the model. In a highpower fiber laser, the application of a largemodearea lma doubleclad fiber can effectively reduce the power density of the fiber core and improve the threshold power of nonlinear. Since this demonstration of the potential of power scaling of fiber lasers and amplifiers with diffractionlimited beam quality using lownumerical aperture largemodearea fibers, numerous high power singletransverse mode fiber lasers have been realized by several research groups. In other words, the technology for building highpower fiber lasers had gotten ahead of user needs at the highest power levels. Highpower fiber lasers and amplifiers rp photonics. The laser light can have very good beam quality even. Recent developments in rareearths doped nanoengineered glass based optical fibers for high power fiber lasers. Azurlight systems is a supplier of highpower fiber lasers and amplifiers. Highpower fibre lasers are in demand for industrial, defence and scientific applications. We summarize recent developments in high power fiber laser technologies and discuss future trends, particularly in their current and future use in. Fiber optic components for high power fiber laser applications.
Berdine hardback textbook 436 pages 20, directed energy professional society. Introduction to high power fiber lasers second edition. The lasers are available with a wide variety of fiber terminations, collimation. The highpower fiber laser is superior to other highpower lasers with a gain medium of solid crystal or gas in all aspects such as beam quality, energy efficiency, space efficiency, stability and reliability, and is getting the major position in laser processing field. These high brightness lasers provide up to 5 w of output power from a singlemode fiber optic making them ideal for a wide range of industrial and scientific applications. For most of the aforementioned applications, higher output power is required to achieve better performance. Fiber lasers have thus been the fastestgrowing segment of the laser market for the past decade. The lowpower optical fiber amplifier 1 1, acclaimed as the mainstay of the fiberbased internet, can be massively scaled to emerge. The low power optical fiber amplifier 1 1, acclaimed as the mainstay of the fiber based internet, can be massively scaled to emerge.
Welding with high power fiber lasers a preliminary study. With the development and ongoing qualification of highpower claddingpumped fiber lasers based on our gtwave pumpcoupling technology, spi has brought to market a range of cw and fiber lasers and amplifiers operating in the 1. Pulsed fiber lasers with peak powers up to 25kw have been demonstrated and are also. This figure shows only the results achieved in a single transverse mode. As the technology matures, the techniques and accessories that aid the use of these lasers are growing evermore sophisticated. The thermallyguided fiber rod tgfr laser is suggested as a novel power scalable concept. Experimental results based on rareearthdoped fibers have impressively shown that fiber lasers and amplifiers are an attractive and power scalable solidstate laser concept. The rise in output power from rareearthdoped fiber sources over the past decade, via the use of claddingpumped fiber architectures, has been dramatic, leading to a range of fiber based devices with outstanding performance in terms of output power, beam quality, overall efficiency, and flexibility with regard to operating wavelength and radiation format. Addressing the need for detailed, organized high power fiber laser technology in single work for use in education, research and industry, the authors present a collection of information from hundreds of research publications arranged it in a logical format.
Introduction the field of lasers has a relatively short history starting from 1960 with maimans first demonstration of laser action in ruby 1. The first rareearthdoped fiber lasers were operated in the early sixties, and produced a few milliwatts at a wavelength around one micron. Experimental data show that the linewidth broadens as a power function between 0. The number of amplification stages varies among laser designs typically between 0 and 2. Azurlight systems is a supplier of high power fiber lasers and amplifiers. The rise in output power from rareearthdoped fiber sources over the past decade, via the use of claddingpumped fiber architectures, has been dramatic, leading to a range of fiberbased devices with outstanding performance in terms of output power, beam quality, overall efficiency, and flexibility with regard to operating wavelength and radiation format. Lecture 106 effect of the l increase on maximum output power of 2m gasbbased laser. May 20, 2011 lasers are used in a wide range of applications that benefit from the pinsharp spatially coherent beam and immense pulse peak power they can provide. It is capable of handling up to 10 kw cw with high power loss capability. A high brightness singleend pumping monolithic fiber laser with 10. To enable the commercial development of these high power fiber lasers, we have demonstrated several allfiber components, which replace the bulkoptic interface in the present laser configurations. Highpower passive fiber components for allfiber lasers. Fomin et al, 3 kw yb fibre lasers with a singlemode output, international.
Here we arbitrarily defined high power fiber operation as being close to a single mode in beam output with powers in the kilowatt range. Pdf we discuss fundamental aspects of highpower fiber lasers and describe their recent dramatic advances and prospects including our uptodate. Fiberguide industries offers fibers specifically designed for demanding high power applications such as material processing and fiber lasers. Cw green fiber laser ipg photonics high power fiber lasers cw green fiber laser ipg photonics extends its family of unique and highlyefficient high power, singlemode, singlefrequency, lownoise, cw green fiber filename. This thesis focuses on developing power scaling architectures for solidstate and fiber lasers. Solidstate laser pumping bwt beijings high power diode laser modules are manufactured by adopting specialized fiber coupling techniques, resulting in volume products with a high efficiency, stability and superior beam quality. Silica is generally the material of choice for highpower fiber lasers and amplifiers for the following reasons. These components include multimode fused fiber bundle combiners with or without signal fiber feedthrough, bragg gratings and mode field adaptors. Fiber lasers have been stated to be a serious alternative to solid state and carbon dioxide lasers for different materials processing applications. Lecture 101 high power diode lasers computer engineering. Very high melting temperature and mechanical strength relatively simple and wellestablished techniques for fiber fabrication very low loss. Ipgs single largest market for highpower fiber lasers is cutting, and samson says that 8to10kw multimode fiber lasers have become common in that field only in the past two or three years.
In this regime, fiber devices are limited mainly in terms of peak power. Larger image back cover introduction to high power fiber lasers second edition r. In such systems, peak power and average power levels are. Schematic diagram showing the key components of a highpower laser system. Limpert, high power fiber lasers, in optical fiber communication conference, osa technical digest online optical society of america, 2017, paper w1f. The first fiber laser was demonstrated by snitzer in 1961 2.
Due to the outstanding performance and the inherent attractive advantages, high power fiber lasers have been widely used in industrial manufacture, medicine, advanced research, national defense and security, and so on. It is a wellproven standard fiber in the industry with a compact design, efficient internal water cooling and a rugged but flexible outer hose. Ipgs high power cw fiber lasers cover output power range from 1 kw to over 100 kw and feature a wide range of operating wavelengths, singlemode and multimode options, high stability and extremely long pump diode lifetime. We discuss our approaches using singlepolarization fiber and lownonlinearity photonic band gap fiber as technologies for developing the next generation of. Both continuouswave cw and pulsed highpower fiber laser systems constantly require technological advances.
Hence, high power fiber lasers have been developed significantly and presented in many excellent articles 1, 2, 4, 39 48. Very low power consumption a 3000w fiber laser requires 10kw of electrical power plus 5kw for a chiller with a total of 15kw. High power fiber lasers occupy probably the most challenging and demanding place in the whole field of fiber laser technology. Hajim school of engineering and applied sciences university of rochester rochester,new york 2009. For one, lockheed martin laser and sensor systems bothell, wash. The broadening of high power fiber lasers deviate from the model. The broadening of highpower fiber lasers deviate from the model. In particular, we describe design and performance of allglass doubleclad laser fibers, broadarea laser pumps, and pump coupling optics. Fiber lasers were arisen in the early sixties and used widely at low power levels through out the 80s and the 90s as optical. Hpflp continuous wave fiber laser the hpflp is a 1550nm high power cw fiber laser from bktel. Both continuouswave cw and pulsed high power fiber laser systems constantly require technological advances. A simple modification of the model is proposed which fits all the experimental data. These lasers are watercooled and can be supplied with a builtin or standalone chiller. Pdf high power ytterbiumdoped fiber lasers fundamentals and.
In recent years, fiber lasers have received significant attention due to their outstanding heat dissipation performance, high conversion efficiency, low pumping threshold, wide tunable range, and good beam quality, and. Considering the significant practical advantages of optical fibers, this. Laser net, profibus, device net, ethernet, digital, analog nema 12 construction switching up to 6 way wide spread use on welding, cutting, cladding, and. This growth has largely been led by yb fiber lasers up to now. These applications require precision with minimal surrounding damage and accuracy, both of which can be achieved with a highquality diffractionlimited laser beam. Highpower fiber lasers for directedenergy applications p. Recent developments in rareearths doped nanoengineered. Nilsson, highpower fiber lasers kth winter school, romme, feb 5 2016 14 energy levels in rareearth ions highpower fiber lasers are generally doped with rare earths lots of energy levels and transitions in re ions in silica, only four metastable levels can be pumped with highpower laser diodes six transitions have. Tailored for high performances, our infrared ir lasers and visible vis lasers all feature high power, ultralow noise, single frequency, single mode, excellent power and pointing stability. Special attention is placed on pump combination techniques and the parameters that affect the brightness enhancement observed in. High power fiber lasers and applications to manufacturing. Highpower fiber sources operating in the near and midinfrared.
This model has been previously validated with a low power erdoped fiber laser 1 and with raman fiber lasers 2. We discuss our approaches using singlepolarization fiber and lownonlinearity photonic band gap fiber as technologies for developing the next generation of high power fiber lasers. The highpower fiber laser is superior to other highpower lasers with a gain medium of solid crystal or gas in all aspects such as beam quality, energy efficiency. Hafizi2 1plasma physics division 2icarus research, inc. The many types of fiber lasers include low power continuouswave cw and low and highenergy pulsed, including. Many high power lasers for material processing are qswitched lasers, generating intense nanosecond pulses. Highpower fiber lasers for directedenergy applications.
Highpower fiber lasers and fiber amplifiers are nearly always realized with rareearthdoped doubleclad fibers, which are pumped with fibercoupled highpower diode bars or other kinds of laser diodes. Optics for 1 micron high power fiber lasers with decades of knowledge and experience in the optical industry, using cuttingedge measurement equipment, ophir offers a wide array of first class optics for high power fiber lasers in the 1 micron wavelength range, including. This rapid advance in technology has occurred with rareearthdoped. High power fiber lasers and amplifiers swissphotonics. The most important components for application in highpower all. Pdf highpower fiber lasers and amplifiers martin muendel. In many cases, notably manufacturing, high average power is essential for cutting, welding, and drilling. Oct 20, 20 high power fibre lasers are in demand for industrial, defence and scientific applications. The laser and beam control system are mounted on a truck adapted to carry the laser and its accompanying cooling system. Rqb fiber the aircooled version of the qbh fiber optic cable, with identical mechanical. Specialty fiber components are an increasingly important part of generating and transmitting highpower laser beams for applications ranging from materials processing to laser surgery to lidar. Symposium on high power fiber lasers and their applications 2006.
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