This ultrafast widebandtunable laser only uses singlemode fibers and standard. Ultrafast fiber lasers using novel semiconductor saturable. However, the transverse mode instability tmi was seldom reported in the tapered fiber lasers at high average power levels. Newbury,2 and ian coddington2, 1center for measurement standards, industrial technology research institute, 321.
The tapered gain fiber has a longitudinally varying mode area, which has the advantage of mitigating fiber nonlinear effects. The principles of operation and basic design and fabrication criteria, which have to be taken into account while. This complete integration of the laser process leads to the inherent compactness and longterm stability of fiber lasers, because no components are necessary in a long free space cavity. Low noise, tunable hofiber soliton oscillator for hoylf. Highpower singlemode tapered doubleclad ytterbium fiber.
Their continuous improvements have started to challenge other laser technologies due to their compact design, inherently high beam quality and alignment free format 1,2. Basics, technology, and applications crc press book the fiber laser, with its humble beginning in the late 1980s, has undergone tremendous development in the past decade or so, transforming itself from a research curiosity to a major force in modern manufacturing. Thus, in bulk fiber lasers approaches, the use of higher pump powers is required to increase the laser output power 23. A comprehensive account of the latest developments and applications in this rapidly developing field, covering a wide range of topics, such as power scaling and short pulse generation, dispersion management and modeling, broadband supercontinuum generation and wavelength tailoring. This outperforms the current achievable pulse duration from tunable nanotube modelocked lasers. Pulse dynamics in carbon nanotube modelocked fiber lasers. Our fiber lasers include an mir supercontinuum source 1. Ultrafast lasers with tunable parameters in wavelength and time domains are the choice of light source for various applications such as spectroscopy and communication. The koheras boostik hp is a maintenance free single frequency fiber laser with a unique combination of narrow linewidth, excellent beam quality and high output power.
Pump propagation and absorption in active tapered doubleclad fiber has been analyzed based on a ray optics approach. Sep 16, 2005 ultrafast fiber lasers for homeland security ultrafast fiber lasers for homeland security okhotnikov, o. The book brings together contributions from the worlds leading experts at major collaborative research centers. Featuring contributions from leading fibre laser scientists such as oleg okhotnikov, andreas tunnermann, philip russell, frank wise, sergei turitsyn and stuart jackson. The refractive index is plotted on the horizontal axis, and the radial distance from the core axis is plotted on the vertical axis. The highquality pulses obtained can then be compressed. Free reading semiconductor disk lasers okhotnikov oleg g debbie macomber publishing file id 43437b0 creator. A strong impact of a new effect dynamic gain induced pulse shortening, on the duration, repetition rate and energy of a qswitched fiber laser was studied. The fiber laser concept is most suitable for the realization of upconversion lasers, as these often have to operate on relatively difficult laser transitions, requiring high pump intensities.
Practical aspects of fiber lasers, especially when handling high power 2. Whereas the first fiber lasers could deliver only a few milliwatts of output power, there are now highpower fiber lasers with output powers of hundreds of watts, sometimes even several kilowatts from a single fiber. Lidar because the two combs are replaced by free running, saturableabsorberbased femtosecond er fiber lasers, rather than tightly phaselocked combs, with the entire time base provided by a single 10digit frequency counter. Okhotnikov, tunable hodoped soliton fiber laser modelocked by carbon. A passive modelocked linearresonator fiber laser using polarizationmaintaining fibers and a saturable absorber to produce ultra short pulses and a longterm reliable operation with reduced maintenance. Stretchedpulse fiber lasers based on semiconductor. Control of multiple solitons in mode locked figureofeight micro structured fiber lasers to improve soliton stability. Evince semiconductor materials short pulse generation electrical pumping and laser applications the book provides readers with a comprehensive account of the request pdf semiconductor disk lasers physics and technology this. Many of the fiber lasers are built in a ring configuration to remove the need for mirrors and eliminate spacial hole burning. A number of passively modelocked tdf lasers have been. Fiber nonlinearities, such as stimulated raman scattering or fourwave. Consequently, the improvements in a fiber technology have resulted in significant development in related fields, for instance, the fiber lasers that intensively enter into the applications which previously were covered exclusively by solidstate lasers. The development of fiber lasers is rooted in a number of technical areas including optical materials, optical waveguide design, nonlinear optics, optical fiber fabrication, and optical characterization, in addition to optical fiber components, and fiber laser design and. Osa high power monolithic tapered ytterbiumdoped fiber.
We obtained reliable operation at the fundamental repetition rate with 1. Ultrafast fiber lasers have been extensively studied and developed over the past decades 1,2. Importantly, biophotonics and biomedical imaging applications ideally require a compact, power. Here we present an ultrafast tunable fiber laser modelocked by a nanotube based saturable absorber. Basics, technology, and applications crc press book. Okhotnikov, multimode erdoped fiber for singletransversemode. The approach taken in this thesis relies on using modelocked fiber lasers as pump sources for frequency. A comprehensive account of the latest developments and applications in this rapidly developing field, covering a wide range of topics, such as power scaling and short pulse generation, dispersion management and modeling, broadband supercontinuum g.
The first rareearthdoped fiber lasers were operated in the early sixties, and. Optics for fiber laser applications logical marketing, llc. In section ii, we present a picosecond modelocked yb fiber laser tunable over 125 nm from 980 to 1105 nm delivering pulses of 12ps duration. In this work, we have constructed a monolithic tapered ytterbiumdoped fiber laser oscillator and investigated the laser oscillator performance with respective 976 nm and 915 nm pump, especially on the aspects of the tmi. We give an overview of recent achievements in ultrafast fiber lasers. They are related to doped fiber amplifiers, which provide light amplification without lasing. In particular, compact modelocked lasers stabilized by nearresonant sesams can be realized in a short. Despite the simpler design, the system provides a factor of three. The saturable absorbers are used to initiate the mode locking, to stabilize the pulse train and to control the cavity dispersion. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Submicron absolute distance measurements in submillisecond times with dual free running femtosecond er fiberlasers tzean liu,1 nathan r.
There are lot of discussions on the current state of art in fiber lasers but there are some parts of the book that could be improved. Okhotnikov, dispersion compensationfree fiber laser modelocked and stabilized by high contrast saturable absorber mirror, ieee j. A fiber laser or fibre laser in british english is a laser in which the active gain medium is an optical fiber doped with rareearth elements such as erbium, ytterbium, neodymium, dysprosium, praseodymium, thulium and holmium. A tapered doubleclad fiber tdcf is a doubleclad optical fiber which is formed using a specialised fiber drawing process, in which temperature and pulling forces are controlled to form a taper along the length of the fiber. Author publications 50 proceedings article 27 april 2016.
Filippov, v chamorovskii, y kerttula, j golant, k pessa, m okhotnikov, o. We manufacture fibercoupled laser diode, sld and photodiode modules. Pdf control of multiple solitons in mode locked figure. Wavelength and pulse duration tunable ultrafast fiber. Stretchedpulse fiber lasers based on semiconductor saturable. Aug 24, 2012 a comprehensive account of the latest developments and applications in this rapidly developing field, covering a wide range of topics, such as power scaling and short pulse generation, dispersion management and modeling, broadband supercontinuum generation and wavelength tailoring. The fiber laser is pumped by a single fibercoupled diode laser operating at 915 nm and provides over 30 mw of average. An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Wavelength and pulse duration tunable ultrafast fiber laser. This potential arises from a high surfacetovolume ratio avoiding excessive heating and the guiding effect, which avoids thermooptical problems even under conditions of. Apr 24, 2014 stretchedpulse modelocked erbiumdoped fiber lasers based on monolithically grown ingaaspinp semiconductor saturable absorber mirrors are described. Modelocked fiber lasers based on semiconductor saturable. Modelocked fiber lasers emitting in the wavelength range beyond 2.
The important aspects of the modelocked fiber lasers relevant to practical security systems are presented. Fiber optics research center, russian academy of sciences, moscow. Zervas, in optical fiber telecommunications sixth edition, 20. Rp photonics encyclopedia fiber lasers, fibre, rare. An advantage of fiber lasers in general is their ability to emit over broad bandwidths in different spectral regions by simply using different active dopants and slightly varying glass host compositions. We provide original equipment manufacturers with components for the most demanding applications in telecom, scientific research, life science, security, aerospace industry and metrology. Aug 20, 2012 a comprehensive account of the latest developments and applications in this rapidly developing field, covering a wide range of topics, such as power scaling and short pulse generation, dispersion management and modeling, broadband supercontinuum generation and wavelength tailoring. A fiber laser is a laser in which the active gain medium is an optical fiber doped with rareearth. Stretchedpulse modelocked erbiumdoped fiber lasers based on monolithically grown ingaaspinp semiconductor saturable absorber mirrors are described. Compared with some older books on fiber lasers and amplifiers, there is more useful material on various practical aspects, e. Pulse dynamics in carbon nanotube modelocked fiber lasers near zero cavity dispersion jinzhang wang,1 zhiping cai,2 ping xu, 3 geguo du, fengqiu wang,4 shuangchen ruan,1, zhipei sun,5 and tawfique hasan6 1college of optoelectronic engineering, shenzhen university, shenzhen 518060, china 2department of electronics engineering, xiamen university, xiamen 361005, china. Ultrafast fiber lasers for homeland security, proceedings.
We report a 500fs wideband tunable fiber laser modelocked using this nanotube saturable absorber. Also, the use of bulk elements in fiber lasers produces a beam quality degradation and the addition of high cavity losses, resulting in a decrease of laser performance and efficiency. Continuous wavelength tuning from 1530 nm to 1563 nm is achieved without the adjustment of any intracavity components. In the power scaling of monolithic fiber lasers, the fiber nonlinear effects and transverse mode instability are main limitations. Ultrafast fibre laser systems based on sesam technology. Optical amplifiers, modulation, amplifiers, fiber lasers, wave propagation, ytterbium, picosecond phenomena, q switched lasers, laser optics, absorption. Ultrafast fiber lasers for homeland security ultrafast fiber lasers for homeland security okhotnikov, o. Modelling of the fiber lasers since the models are generally simplified ones. In order for the ring to operate unidirectionally, it is necessary to insert an isolator in the cavity. Most of the demonstrations have been based on passive modelocking using semiconductor saturable absorber mirrors sesams as modelockers 9,10,11,12. Duling iii, in experimental methods in the physical sciences, 1997. The tdcf amplifier was first conceived and demonstrated at tampere university in the research group of professor oleg okhotnikov in 2008. Fiber based high power laser systems jens limpert1, thomas schreiber1 and andreas tunnermann1,2 1friedrich schiller university jena, institute of applied physics, alberteinsteinstr.
A stepindex fiber has a central core with a uniform refractive index. Fiber lasers wiley online books wiley online library. The most important components for application in highpower allfiber lasers and amplifiers are, most of all, power combiners, but also mode field adaptors. The book brings together contributions from the worlds leading experts at major collaborative. Pulse dynamics in carbon nanotube modelocked fiber lasers near zero cavity dispersion jinzhang wang,1 zhiping cai,2 ping xu, 3 geguo du, fengqiu wang,4 shuangchen ruan,1, zhipei sun,5 and tawfique hasan6. In addition to cw bismuthdoped fiber lasers, modelocked lasers operating at all major wavelengths covered by cw bismuth fiber lasers have been demonstrated. Such a fiber laser can be configured to produce tunable. The fewcentimeterlong highly doped ybfiber and short segment of singlemode fiber are contained in the cavity providing a low.
This paper summarizes recent achievements in the area of development and fabrication of highpower passive fiber components. It is useful to have a combination of two authors with quite different backgrounds, such that all these aspects can be treated. Passively qswitched tmhodoped fiber lasers operating at 2. High power monolithic tapered ytterbiumdoped fiber laser. Fiber technology offers a rich supply of compact and maintenance free lasers delivering ultrashort pulses in a broad wavelength range.
Rp photonics encyclopedia fiber lasers, fibre, rareearth. Optimization of the longitudinal shape, absorption and angular distribution of the pump beam allowed for power scaling of a ytterbium fiber laser up to 600 w with high beam quality m 2. Subpicosecond tunable ultrafast lasers are important tools for many applications. Submicron absolute distance measurements in submillisecond. Ultrafast fiber lasers for homeland security, proceedings of. The technology was granted a patent in 20 as a means to overcome the nonlinear optical effects which previously limited the powerscaling of fiber lasers and fiber amplifiers. By using preclad fiber preforms both the fiber core and the inner and outer cladding layers vary in diameter and thickness along the full length of the fiber. However, ultrashort pulses in the visible and uv domains are difficult to obtain directly from fiber lasers. In all the elaborate, fiber lasers are described especially in respect of the classical laser, showing in this way what are the changes and first of all the advantages that we can reach with a. Optical amplifiers and lasers based on tapered fiber geometry for power and energy scaling with low signal distortion valery filippov, yuri chamorovskii, konstantin golant, andrei vorotynskii, oleg okhotnikov.