In order to describe and manage such dispersion effects a mathematical description of an ultrashort laser pulse is given first before we. Ultrashort laser pulse phenomena combines theoretical backgrounds and experimental techniques and will serve as a. Introduction to fiber laser marking photonics online. Ultrashort pulse formation and evolution in modelocked. By using tmdoped and tmhocodoped silicate fibers various 2 micron modelocked fiber lasers are presented including ghz repetition rates and 140fs pulse width.
Complete field characterization of ultrashort pulses in fiber. Advances in fiber laser spectral beam combining for power. Pulse repetition rate scaling from 5 to 100 ghz with a. This is achieved by using a highaverage power picosecond laser in conjunction with a unique, inhouse developed polygon mirrorbased biaxial scanning system. Highthroughput ultrashort pulse laser machining is investigated on various industrial grade metals aluminum, copper, and stainless steel and al 2 o 3 ceramic at unprecedented processing speeds. This covers the development of reliable and cheap low power laser sources as well as high average power ultrashort pulse lasers for large scale manufacturing. A conventional bulkgrating compressor was used to remove the linear chirp. Advances in high power, short pulse, fiber laser systems and. An ultrashort pulse laser is a laser that emits ultrashort pulses of light, generally of the order of femtoseconds to ten picoseconds. Here we report results on a fiber sbc system where we achieved 30 kw by combining 96 individual fiber lasers into a single high brightness beam with a beam quality of m 2 1. Highpower laser system generates ultrashort pulses of. Jun 27, 2017 ultrashort pulse fiber laser reaches unprecedented performance at cornell by daryl lovell cornell university researchers have engineered a new kind of environmentallystable fiber laser that generates high power ultrashort light pulses, opening new possibilities and applications for the fiber source. The average maximum power of 285 mw and a pulse energy of 8. Amphos laser systems start a new era of laser materials processing outstanding feature is the unique combination of highest output power and ultrashort pulses.
They are related to doped fiber amplifiers, which provide light amplification without lasing. Advanced ultrafast fiber laser sources enabled by fiber. An interesting question is whether claddingpumped fiber lasers and amplifiers are powerscalable. A 20 watt fixed pulse width fiber laser will approach 1 mj of energy per pulse at a pulse frequency of about 20 khz and 20 watts of output power. Index termsfiber lasers, optical pulse generation, laser mode locking, laser. The system incorporates a novel pulse source based on a low power pulsed semiconductor laser, and which shows the compatibility of high power fiber technology with compact, low cost sources. Optical fiber laser generates ultrashort high energy pulses. The characterization of the ultrashort high power laser pulses has always been a challenge it requires using the same pulse to measure itself, because it does not exist a shorter event do not exist an event shorter to compare to. Advances in high power, short pulse, fiber laser systems. One of the first coherent, tutorial graduate level textreference books on ultrashort laser phenomena, this book presents an introduction to the phenomena and explains how it can be used to help examine problems in areas such as electromagnetism. They can be used for laser cutting, drilling, laser marking or surface treatment applications. In this paper, a laser with a wavelength of 1030 nm, pulse duration of 19 ps, repetition rate of 10 khz, and burst regime consisting of either four or. The scope of the present research is to deliver the high power and repetition from dee eng003 at universidade federal da bahia.
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. This performance level has been achieved by optimizing the pulse shape, reducing. Thuliumdoped fibers with ultra large modefield areas offer new opportunities for the power scaling of midir ultrashort pulse laser sources. New ultrashort pulse fiber laser ultrashort pulsed fiber laser is easy to operate, compact in structure, stable in performance and low in cost. The system demonstrates a fiber laser, based on passive mode locking using a saturable absorber, capable of producing ultrashort pulses. This results in permanent material changes, largely independent of the processed glass, and it is of particular relevance for cleaving applications.
Pulse repetition rate scaling from 5 to 100 ghz with a high. Together with the good focusability, high pulse peak powers and average powers, this allows for. If such true power scalability is given, the laser performance can be increased within a wide range of output powers without relying on new materials e. Short pulse high power fiber laser systems request pdf. Fiber based ultrashort pulse laser systems at ultrahigh. Here, we present a laser system delivering a pulse peak power of 2 gw and a nearly transformlimited pulse duration of 200 fs in combination with 28. Free of maintenance and easy to use, this outstanding fiber laser can be integrated into complex systems. Ultrashort laser pulses allow for involume processing of glass through nonlinear absorption. Unlike conventional ultrashortpulse bulk solidstate laser systems, ultrafast fiber amplifiers can be scaled to average powers 100 w without significant beamquality distortion from thermal lensing. These properties result in compact, singlepass and even monolithic ultrashortpulse laser systems, which are capable of emitting average powers up to the kilowatt level. The laser system exhibits wattlevel average output power, and is well focusable which results in a highly brilliant infrared light source. Ultrashort pulse fiber lasers and their applications. Power scaling of cw and ultrashortpulse fiber lasers. Pdf high power ytterbiumdoped fiber lasers fundamentals and.
Ultrashort pulse lasers usp lasers which provide sufficient output power for industrial applications offer pulse lengths in the range from some 10 picoseconds to some 100 femtoseconds. Ultrashort laser pulse phenomena, second edition serves as an introduction to the phenomena of ultra short laser pulses and describes how this technology can be used to examine problems in areas such as electromagnetism, optics, and quantum mechanics. Passive modelocking in fiber lasers is investigated by numerical and experimental means. Using the first method, we succeeded to generate 17w average power of linearly chirped parabolic pulses at 75 mhz repetition rate and diffractionlimited. The second system considered again uses a large mode amplifier, operating at 1550nm using eryb codoped fiber. Ipc pas the scientists have forced one of the types of optical fiber lasers to generate ultrashort high energy pulses without the use of mechanically sensitive external parts. The invention could greatly shorten the time of processing materials in industrial laser machines, researchers say. High power, high repetition rate femtosecond fiber laser for. Jun 19, 2003 fiber laser systems offer unique properties for the amplification of ultrashort pulses to high powers. Because of this, a 20 watt fixed pulse width fiber laser is not allowed to work at pulse frequencies lower than 20 khz. Short and ultrashort pulse lasers they are wellsuited for all standard processing methods such as cutting, drilling, ablating and structuring, in a wide range of materials. Harmonic modelocking of fiber ring lasers with soliton pulse compression is addressed.
Raciukaitis, ytterbiumdoped fiber ultrashort pulse. Complete field characterization of ultrashort pulses in. High average power fiber lasers generally consist of a relatively low power master oscillator, or seed laser, and power amplifier mopa scheme. In order to describe and manage such dispersion effects a mathematical description of an ultrashort laser pulse is. These challenges may be overcome using two spmspectra. Request pdf on jan 1, 2006, akira shirakawa and others published power scaling of cw and ultrashortpulse fiber lasers find, read and cite all the research you need on researchgate. Fiber lasers, which consist of ideal waveguides of optical fibers, work as stable, practical, and maintenancefree lasers. Ultrashortpulse laser pulse duration in the range of picoseconds 10 12 s and femtoseconds 1015 s the smaller they are, the stronger they get the immense power of the laser pulses is due to the fact that they are incredibly short. We have seen that the concept of power scaling in a meaningful sense must be based on a welldefined and repeatable scaling procedure. Fiber nonlinearities, such as stimulated raman scattering or fourwave. This feature enhances the ability to detect molecules. Yag laser bulk laser system next, there are demonstrations for simulating the propagation of ultrashort pulses.
For example, a 10 fs laser pulse at a center wavelength of 800 nm propagating through 4 mm of bk7 glas will be temporally broadened to 50 fs. Most ultrashort pulse fiber systems are capable of. The scope of the present research is to deliver the high. Ultrashort pulse reconstruction software in high power laser. Pulsed green fiber laser compact and robust module keopsys. It is widely used in high speed optical communications, optical sensing, optical frequency comb, laser radar, spectrum analysis, military and other related fields. Fomin et al, 3 kw yb fibre lasers with a singlemode output, international. This laser is a complete tool for environmental monitoring and 3d scanning. Based on master oscillator power amplifier mopa configuration and optimized design of multistage optical amplification, it can reach high peak power and ns pulse width output. Innoslab the concept for power scaling power scaling at 1. Ultrashort laser pulse phenomena, third edition optics and photonics series currently unavailable. Apr 23, 2018 the laser system exhibits wattlevel average output power, and is well focusable which results in a highly brilliant infrared light source.
Highpower laser system generates ultrashort pulses of light. In amplifiers for ultrashort optical pulses, the optical peak intensities can become very high, so that detrimental nonlinear pulse distortion or even destruction of the gain medium or other optical. A passively modelocked ultrashort pulse fiber laser using the intensity. The colid series 1550nm short pulse fiber laser for lidar of connet is a fiber laser source delivering high peak power and high pulse energy. Unlike conventional ultrashort pulse bulk solidstate laser systems, ultrafast fiber amplifiers can be scaled to average powers 100 w without significant beamquality distortion from thermal lensing. High power, high repetition rate femtosecond fiber laser. High power fiber lasers and amplifiers swissphotonics. But the mentioned technique is ambiguous and requires knowledge of nonlinearity and peak pulse power 25. Mar 18, 2016 sebastian pricking, petra welp, johannes overbuschmann, sebastian nutsch, raphael gebs, robert fleischhaker, jochen kleinbauer, martin wolf, aleksander budnicki, dirk h. To circumvent the current limitation on single fiber laser output power, chapters are provided on beam combining, beam quality, and fourier optics to further the development and scaling of fiber laser systems past 10 kw with good beam quality. Highthroughput machining using a highaverage power. Ultrashort pulse 2 micron fiber lasers qing wang, jihong geng, tao luo, and shibin jiang. Jul 21, 2011 passive modelocking in fiber lasers is investigated by numerical and experimental means.
They are also known as ultrafast lasers owing to the speed at which pulses turn on and offnot to be confused with the speed at which light propagates, which is determined by the properties of the medium and has an upper limit, particularly its index of. Ultrashort laser pulse phenomena combines theoretical backgrounds and experimental techniques. A chapter is also included on fiber laser limitations. As a consequence ultrafast fiber laser systems with novel performance are in reach, i. Employing an ultrafast erfiber laser and a dispersionshifted. Fixed pulse width fiber lasers have a damage threshold of about 1 mj of energy. In addition to ultrashort pulse duration, ultrashort pulses have a broad spectrum, a high peak intensity and can form pulse trains at a high repetition rate. Ultrashort pulse lasers lasers for industry fiber lasers. Fiber lasers combine gain medium, resonator cavity and mirrors inside an optical. Several operation regimes at positive netcavity dispersion are experimentally accessed and studied in different environmentally stable, linear. Industrial grade fibercoupled laser systems delivering. Sutter, alexander killi, and michael mielke industrial grade fiber coupled laser systems delivering ultrashort high power pulses for micromachining, proc. A nondistributed scalar model solving the nonlinear schrodinger equation is implemented to study the starting behavior and intracavity dynamics numerically.
The fundamentals of laser matterinteraction as well as processing strategies and the required system technology are discussed for these laser sources with respect to precise materials. Power scaling of lasers rp photonics consulting on laser. Highpower femtosecond fiber laser systems, proceedings of. Mar 10, 2014 up to a pulse repetition rate of 15 ghz we obtained average output power 1 w and pulse durations pulse repetition rate from any fundamentally modelocked semiconductor disk laser with 101. Midir ultrashort pulsed fiberbased lasers aston research. Two approaches are discussed, the amplification of linearly chirped parabolic pulses and a fiber based chirped pulse amplification system. The pulsed operation is able to generate very high peak intensities, simplifying everyday procedures like ophthalmology or material processing, or even exotic experiments like plasma physics or particle acceleration. Thuliumdoped fiber chirpedpulse amplification system. A high power, passively modelocked, erdoped fiber laser with a single wall carbon nanotube polyimide film was demonstrated in dispersionmanaged dissipativesoliton modelocking operation. First it is important to acknowledge the relationship between spectral width and pulse. Ultrashortpulse fiber laser reaches unprecedented performance at cornell by daryl lovell cornell university researchers have engineered a new kind of environmentallystable fiber laser that generates highpower ultrashort light pulses, opening new. Altair produces high average power with ultrashort femtosecond pulses fiber laser providing high stability and excellent beam quality. Power scaling of dispersionmanaged erdoped ultrashort. Ultrashort pulse formation and evolution in modelocked fiber.
A general answer is not possible owing to the multitude of applied techniques and the dependence on the specific requirements, e. Up to a pulse repetition rate of 15 ghz we obtained average output power 1 w and pulse durations pdf. The bandwidth of the trumicro series ranges from nanosecond lasers nslasers to ultrashort pulse lasers, picosecond lasers and femtosecond lasers ps and fslasers. Lumibird proposes a compact pulsed green fiber laser emitting at 532nm and delivering high peak power. Pdf ultrashortpulse fiber ring lasers researchgate. Laser ultrashort laser pulses allow for various experiments in basic and industrial research. Short pulse fiber lasers modelocked by carbon nanotubes and graphene. These properties result in compact, singlepass and even monolithic ultrashort pulse laser systems, which are capable of emitting average powers up to the kilowatt level. Altair produces high average power with ultrashort femtosecond pulses ultrashort pulse bulk solidstate laser systems, ultrafast fiber amplifiers can be scaled to average powers 100 w without significant beamquality distortion from thermal lensing. All industrial sectors can benefit from amphos laser technology.