However, bidoped fiber lasers and amplifiers are still far from their optimum performance owing to the unclear nature of the nearinfrared emitting bi active centers. In the power scaling of monolithic fiber lasers, the fiber nonlinear effects and transverse mode instability are main limitations. Koheras boostik hp high power, lownoise single frequency lasers. And finally, other pcf based linear fiber lasers are presented in section 5. Evolution and stability of pulse regimes in sesammode. Highpower singlemode tapered doubleclad ytterbium fiber. Reprint order form pdf cost confirmation and order form pdf fiber optics. The pulse duration could be adjusted from 2ns to 200ns. Optics for fiber laser applications logical marketing, llc.
Raman fiber lasers provide versatile platforms to obtain highbrightness lasing over a broad wavelength range. Ultrafast fiber lasers play key roles not only in scientific research, but also in commercial applications. Wavelength and pulse duration tunable ultrafast fiber laser. Covering both fundamentals and advanced research, this book includes both theoretical and experimental results. Fiber lasers that bridge the shortwave to midwave regions. 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. To date, many different fiber optic lasers and amplifiers containing the tdcf have been demonstrated. The saturable absorbers are used to initiate the mode locking, to stabilize the pulse train and to control the cavity dispersion. Pump propagation and absorption in active tapered doubleclad fiber has been analyzed based on a ray optics approach. Selfstarted modelocked operation was obtained in 9801030nm wavelength range with a fundamental repetition rate of 140 mhz.
The laser cavity consists of a fiber length with bulk optic mirrors or fiber bragg. Allfiber lasers through photonic crystal fibers in. From microresonators to fiber lasers philippe grelu by recirculating light in a nonlinear propagation medium, the nonlinear optical cavity allows for countless options of light transformation and manipulation. However, using innovative fiber designs suchfibers, a significant as largemodearea reduction in power density in the fiber core can be achieved with the retention of the outstanding thermooptical properties. Therefore, edgeemitting diode lasers can achieve extremely high repetition rates up to a thz 5, and their active modelocking can yield subpicosecond pulses 6. The linear fiber lasers that employ pcfs for signal enhancement are described in section 5. Optoelectronics research centre at tampere university of.
The recent development of highpower fiber lasers is also fundamentally shaping a wide range of other areas from physical sciences and medicine to geology and space exploration. The fiberoptic modeling and design software rp fiber power. Bismuth bi doped fibers have shown promising potential for lasers and amplifiers in the 11501500 nm and 16001800nm wavelength region. Ultrafast fiber lasers using novel semiconductor saturable. Pulse fiber laser series lasersmart laser fiber laser. Several fiber lasers covering the spectral range from 610 nm to 2710 nm have been reported table 1. Interest in fiber lasers has been driven by the phenomenal growth in fiberoptic communications, which itself resulted from the fundamental breakthrough in producing. 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. Double nanosecond pulses generation in ytterbium fiber laser. Stretchedpulse modelocked erbiumdoped fiber lasers based on monolithically grown ingaaspinp semiconductor saturable absorber mirrors are described. A sesam passively modelocked fiber laser with a long. Passively modelocked fiber laser based on a hollowcore photonic crystal fiber filled with fewlayered graphene oxide solution zhibo liu,1,2 xiaoying he,1 and d. Okhotnikov tampere university, finland was awarded the ph.
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. In the past few years, the tactical deployment of direct energy weapons based on fiber lasers has become a reality. It is shown that the influence of vignetting in a tapered fiber can be avoided, resulting in high overall efficiency, in good agreement with the presented model. Advances in fiber laser technology can be used to further the capabilities of the homeland security. As in the case of amplifiers, the fiber laser can be end pumped. On the contrary, modelocked fiber lasers routinely operate at a high repetition rate above 10 mhz with a short pulse width in the range of femtoseconds to tens of. Get your kindle here, or download a free kindle reading app. Dec 11, 2017 in this research, by adopting an alternative novel approach to ultrashort giant pulse generation which basically originated from difficulties with traditional employed methods, an optimized eryb codoped doubleclad fiber amplifier is applied to boost output average power of singlemode output pulses to a high level of 2w at 1.
The average output power is up to 20w and the highes pulse energy is 0. Three and fourlevel transition dynamics in ybfiber laser. Such a fiber laser can be configured to produce tunable pulse repetition rate and tunable laser wavelength. Koheras boostik hp high power, lownoise single frequency lasers the koheras boostik hp is a maintenancefree single frequency fiber laser with a unique combination of narrow linewidth, excellent beam quality and high output power. Modelling of the fiber lasers since the models are generally simplified ones. Qswitched fiber lasers usually operate at a low repetition rate of 10200 khz accompanying a long pulse width over tens of nanoseconds. We give an overview of recent achievements in ultrafast fiber lasers. Jackson university of sydney, optical fibre technology centre, australian photonics, 206 national innovation centre, 6 q2 australian technology park, eveleigh, sydney, nsw 1430, australia. Modelocked fiber lasers based on semiconductor saturable. Picosecond sesambased ytterbium modelocked ber lasers core.
Stretchedpulse fiber lasers based on semiconductor. Fiber lasers can be designed with a variety of choices for the laser cavity. Qswitching and mode locking are two general methods for pulse laser generation. Since 1999 he has been a fulltime professor at optoelectronics research centre, tampere u. Rp fiber power simulation and design software for fiber. Solutionprocessed twodimensional materials for ultrafast. It is seen that if laser power is low, pulse width. Two recent developments are highpower doubleclad lasers and cascaded fiber raman lasers, discussed in the following two sections. Practical aspects of fiber lasers, especially when handling high power 2. The important aspects of the modelocked fiber lasers relevant to practical security systems are presented. Since 1999 he has been a fulltime professor at optoelectronics research centre, tampere university of technology. Recent progress of study on optical solitons in fiber lasers.
Single fiber, singlemode continuouswave cw output in addition to fiber technology advancements, power evolution in fiber lasers with near diffractionlimited output has followed and depended critically on the maturity of the pumping technologies, and their progress from low brightness diodes to combined highbrightness diode modules, and. Thorlabs nir highpower fiber coupled laser sources are highperformance benchtop fabryperot laser diode sources with tec, which offer excellent stability and computer control. We obtained reliable operation at the fundamental repetition rate with 1. This configuration is suitable for power scaling in which many pump sources are used around the periphery of the coil. Simple design for singlemode high power cw fiber laser. The behavior of transient oscillations has been studied experimentally for the first time in a broadly tunable ytterbium fiber laser. Allfiber highpower monolithic femtosecond laser at 1. Using semiconductor saturable absorber mirrors allows for reliable modelocked operation with different values of cavity dispersion in a broad spectrum ranged from 900 to 1600 nm. 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. Another type of fiber laser is the fiber disk laser. Ytterbiumdoped fiber laser as pulsed source of narrowband. Holmium fiber laser based on the heavily doped active. Fiber laser sources can produce highly coherent, lownoise output, pumped by laser diodes. 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.
User manual 100w300w qswitched pulsed fiber laser v1. See our free tutorial passive fiber optics, for which the software has been used extensively, and also the tutorial modeling of fiber amplifiers and lasers, which explains concepts and methods. The book brings together contributions from the worlds leading experts at major collaborative research centers. Fiber lasers have applications in such diverse fields as telecommunications, printers, materials processing, and medical applications. Fiber lasers that bridge the shortwave to midwave regions of the infrared spectrum stuart d. It includes a discussion of high power yb doped fiber lasers and the nonlinear. Two sequential 60200 ns laser pulses with variable delay between them were generated by acoustooptic modulator opening with continuous diode pumping. In this research, by adopting an alternative novel approach to ultrashort giant pulse generation which basically originated from difficulties with traditional employed methods, an optimized eryb codoped doubleclad fiber amplifier is applied to boost output average power of singlemode output pulses to a high level of 2w at 1. In normal dispersion regime, the laser delivered 14 ps pulses which could be compressed to 1. An example of proposed mopa configuration for high power cw fiber laser showing the core diametercore na for. Short pulse fiber lasers modelocked by carbon nanotubes. The mfpt20mopa pulsed fiber lasers series products are aircooled, maintenancefree fiber lasers with a compact and rugged package.
Without using dispersion compensation, the lasers produced pulses in a range from 15 to 26 ps. Apr 21, 2016 in this paper, we report the first modelocked bismuthdoped fiber laser operating at 1. A modelocked bidoped fiber laser conference paper pdf available in journal of the optical society of america b 248. Ultralarge core birefringent ybdoped tapered double clad fiber for high power amplifiers andrey fedotov, 1, teppo noronen,2 regina gumenyuk,1 vasiliy ustimchik,3,4 yuri chamorovskii,4 konstantin golant,4 maxim odnoblyudov,5 joona rissanen,1 tapio niemi,1 and valery filippov 5 1tampere university of technology, korkeakoulunkatu 3, 33101 tampere, finland. Okhotnikov published more than 280 journal articles, 100 conference papers, and. Mirrors, diamond, secondharmonic generation, crystals, semiconductor lasers, diodes, vertical external cavity surface emitting lasers, chemical elements, nonlinear crystals, semiconducting wafers, disk lasers. Binh, solitonic interactions in actively multibound soliton fiber lasers, in proceedings of 2009 conference on lasers and electrooptics and quantum electronics and laser science conference cleoqels 2009, vol. Wavelength and pulse duration tunable ultrafast fiber. Fiber nonlinearities, such as stimulated raman scattering or fourwave. Stretchedpulse fiber lasers based on semiconductor saturable.
However, the transverse mode instability tmi was seldom reported in the tapered fiber lasers at high average power levels. Bidoped aluminosilicate, phosphosilicate and germanosilicate fibers provide luminescence around 1150 nm, 0 nm and 1450 nm, respectively. They are related to doped fiber amplifiers, which provide light amplification without lasing. Fiber lasers that bridge the shortwave to midwave regions of. Osa high power monolithic tapered ytterbiumdoped fiber. In such lasers, the pump is not confined within the cladding of the fiber, but instead pump light is delivered across the core multiple times because it is coiled in on itself. Turitsyn, robert herda and oleg okhotnikov abstract we examine the impact of the recovery time of a semiconductor saturable absorber together with the value of its saturation fluence, total net gain, and cavity dispersion on femtosecond pulse generation by modelocked fiber lasers resulting in a. Apr 24, 2014 stretchedpulse modelocked erbiumdoped fiber lasers based on monolithically grown ingaaspinp semiconductor saturable absorber mirrors are described. Jun 16, 2016 double pulse generation mode for nanosecond ytterbium fiber laser was developed.
Passively modelocked fiber laser based on a hollowcore. Okhotnikov, multisoliton complexes in fiber lasers, opt. The internal electronics isolate the laser diode driver from noise coupling such as that produced by nearby switching supplies. Wang1, 1department of electrical engineering, the hong kong polytechnic university, hung hom, kowloon, hong kong 2key laboratory of weak light nonlinear photonics, ministry of education, teda applied physics school. Spectroscopic study of the relaxation frequency allows one to distinguish three and fourlevel transitions and provides a useful tool for controlling the dynamics of pulsed lasers.
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