Freestanding nanoscale graphite saturable absorber for passively modelocked erbium doped fiber ring laser. This indicates that the modelocked laser operation was very stable and free from any qswitching instability. Chu city university of hong kong, hongkong abstract mode locked. Interesting facts about modelocked lasers modelocked lasers do not work 99. Multi mode fiber coupled laser single mode fiber coupled laser pigtail laser most dpss lasers and semiconductor lasers can be customized to fiber coupled lasers.
Spatiotemporal modelocking in multimode fiber lasers science. Ultrafast lasers modelocked by nanotubes and graphene. Allfiber modelocked ultrafast thuliumdoped fiber lasers at 2 m. It is found that depending on the cavity birefringence, stable single, dual and triplewavelength dissipative soliton can be formed in the laser. It is basically a standard nprbased, stretchedpulse fiber laser structure. In relatively short lasers with fewmeterlong cavities, both doublescale and usual pulses as well as some transitional or intermediate regimes between these two may be generated at different settings of the intracavity polarisation controllers or the pump power level see fig. Modelocked thulium fiber laser with mos2 zhen tian, kan wu, lingchen kong et al. Highenergy harmonic mode locked 2 m dissipative soliton fiber lasers nan yang, yulong tang and jianqiu xuhigh averagepeak power linearly polarized all fiber picosecond mopa seeded by mode locked noiselike pulses h l yu, p f ma, r m tao et al. Pdf highenergy passive modelocking of fiber lasers.
It was mentioned earlier that these lasers operate within a large hysteresis window and, as with most passively modelocked fiber lasers, the switchon power is considerably higher than the optimum operating point. Tunable hodoped soliton fiber laser modelocked by carbon. The rp photonics buyers guide contains 47 suppliers for modelocked lasers. Sub 20 attosecond timing jitter mode locked fiber lasers. Fiber lasers modelocked due to nonlinear polarization evolution npe may satisfy these requirements.
Recently, multiwavelength dissipative soliton in an all normal dispersion fiber laser passively modelocked with a sesam has been generated. Our results demonstrate the feasibility of using the novel twodimensional nanomaterials such as ptse 2 and mxene into the fibre laser cavity for the. A laser operated in this way is sometimes referred to as a femtosecond laser, for example in modern refractive surgery. Chapter 5 active mode locking mit opencourseware free. Stability analysis of mode locked figureeight fiber laser m. When operating in the anomalous dispersion regime, a laser emits pulses with shapes close to the hyperbolic secant profile of a conventional soliton. The green glow is from twophoton pump upconversion in the erdoped gain fiber at 550nm.
The laser is self starting and the configuration is implementable as an all fiber laser with standard polarization. Related content lband passively harmonic modelocked fiber laser j du, s m zhang, h f li et al. Related content lband passively harmonic mode locked fiber laser j du, s m zhang, h f li et al. Interesting facts about mode locked lasers mode locked lasers do not work 99. A comprehensive study of achieving highenergy pulses in a ring cavity fiber laser that is passively mode locked by a series of waveplates and a polarizer is presented in this paper. Passively synchronized qswitched and modelocked dualband. Ultrafast soliton and stretchedpulse switchable modelocked fiber. An environmentally stable mode locked fiber laser based on nonlinear polarization rotation is experimentally demonstrated. Modelocking refers to the generation of ultrashort optical pulses in laser systems. Doublescale pulses generated by modelocked fibre lasers and. Laser quantum are the manufacturers of the torus modelocked slm lasers, with patented active modelocking technology to maintain the performance of the output beam, and a stable frequency output across wide temperature fluctuations and long measurement periods. The output of a modelocked fiber laser depends strongly on the net dispersion of the laser cavity.
Here, we present a simple and robust dualcomb system that employs a free running bidirectionally mode locked fiber laser operating at telecommunication wavelength. Components for fiber communication and fiber lasers 7. We have specifically investigated the freespace mode locking dynamics of erbium. Modelocking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration, on the order of picoseconds 10. Modelocked fiber laser how is modelocked fiber laser. The practical advantages of allfiber laser configurations compactness, efficient heat dissipation, high beam quality, and easy alignmentmake them highly soughtafter. Wider adoption of the technique has, however, been hindered by the need for complex and expensive ultrafast laser systems. The modelocked fiber laser we investigated in this work is a nonlinear polarization rotation nprbased passively modelocked ybfiber laser, shown in fig.
An environmentally stable modelocked fiber laser based on nonlinear polarization rotation is experimentally demonstrated. The laser is self starting and the configuration is implementable as an allfiber laser with standard polarization. Allfiber modelocked ultrafast thuliumdoped fiber lasers at 2 m qingqing wang, phd university of pittsburgh, 2014 in this work, we demonstrate three original all. Compared with the passively modelocked pulse laser with gdysa or npr technology alone, the output pulse width of hybrid passively modelocked fiber laser is reduced more than 50 fs. The rp photonics buyers guide contains 47 suppliers for mode locked lasers. Due to a nonreciprocal phase shift, the loop mirror can be operated in a compact and efficient reflection mode, offering the possibility to reach high repetition rates and easy implementation of tuning elements. Modelocked midir fibre laser based on 2d nanomaterials.
Mode locked thulium fiber laser with mos2 zhen tian, kan wu, lingchen kong et al. In our experiment, the initiation of modelocking required at. Mode locking refers to the generation of ultrashort optical pulses in laser systems. Laser physics letters tunable hodoped soliton fiber laser modelocked by carbon nanotube saturable absorber to cite this article. Ultralow timing jitter optical pulse trains from mode locked.
Allfiber coupled cavity fabryperot additive pulse modelocked laser. Schematic of fiber modelocked femtosecond laser with free space modelocking components. Modelocked fiber lasers can also be based on ytterbiumdoped fiber for emission somewhere in the range of roughly 1100 nm. Pdf freespace npr mode locked erbrium doped fiber laser. Laser physics spatiotemporal modelocking in multimode fiber. Recently, multiwavelength dissipative soliton in an all normal dispersion fiber laser passively mode locked with a sesam has been generated. We demonstrate a robust and lownoise allpolarizationmaintaining pm nonlinearamplifyingloopmirror nalm modelocked erfiber laser based on a 3. Conceptual outline of mode locked multimode fiber lasers.
Free space npr mode locked erbrium doped fiber laser based frequency comb for optical frequency measurement by turghun matniyaz b. Typical layout of a fibre laser passively modelocked due to the npe effect. Large normal dispersion modelocked erbiumdoped fiber laser. The shortest pulse achieved thus far from swntsa modelocked fiber lasers is. Pdf we have specifically investigated the freespace mode locking dynamics of erbiumdoped fiber edf modelocked ultrafast lasers via nonlinear. The mode locked fiber laser can be selfstarting and has a longtime stability, and is expected to become seed sources for highpower ultrashort pulse laser. Generally, these types of laser cavities provide typically pulses larger than those provided by a passively locked laser. In these lasers, normal dispersion and nonlinear phase modulation lead to a chirped pulse whose duration and bandwidth grows through most of the cavity.
Polarizationmaintaining nonlinearamplifyingloopmirror. Introduction for their outstanding characteristics, such as high gain, low noise, good thermal property, compactness, and ease in building and operation, femtosecond mode locked fiber lasers are finding more and more applications. Compact, alignmentfree and allfiber picosecond laser source for cars microscopy delivering synchronized pump and stokes pulses from a single fiber end. The mode locked fiber laser we investigated in this work is a nonlinear polarization rotation nprbased passively mode locked yb fiber laser, shown in fig. A comprehensive study of achieving highenergy pulses in a ring cavity fiber laser that is passively modelocked by a series of waveplates and a polarizer is presented in this paper. The first allfiber modelocked laser used erdoped fiber edf as a gain medium, with an operating wavelength of 1550 nm 6,7. An important difference for this technology, as compared with erbiumdoped lasers, is that the dispersion of silica fibers is normally well in the normal dispersion regime. Specifically, it is shown that the multipulsing instability can be circumvented in favor of bifurcating to higherenergy single. Relaxationfree harmonically modelocked semiconductorfiber ring laser. Furthermore, mode locked fiber lasers can rely on telecom components. Schematic representation of the master equation for an actively modelocked laser. Pdf freerunning dualcomb fiber laser modelocked by. Pdf allfiber bidirectional modelocked ultrafast fiber. Conceptual outline of modelocked multimode fiber lasers.
Allnormal dispersion fiber lasers modelocked with a. Swntcmc sa modelocked fiber laser modelocked laser performance of the cavity without the tbwf is first characterized. The laser is based on a novel laser configuration that has negligible lowpower steadystate reflectivity from one side and, consequently, no cw gain. Active and passive mode locking cornell ece4300 fall 2016. Russell1 1max planck institute for the science of light, staudtstrasse 2, 91058 erlangen, germany 2department of computer science and electrical engineering, university of maryland baltimore county, baltimore, maryland 21250, usa. Freespace npr mode locked erbrium doped fiber laser based frequency comb for optical frequency measurement by turghun matniyaz b. Fiber lasers exhibit inherent advantages of high gain coefficient, wide operating wavelength range, excellent heat dissipation, and robust mode confinement 31,32,33,34,35, and thus offer an attractive platform for testing the nonlinear absorption of the samples. Theoretical and experimental developments carsten krogh nielsen department of physics and astronomy university of aarhus, denmark phd thesis december 2006. Modelocked fiber lasers with significant variability of generation. Pdf relaxationfree harmonically modelocked semiconductor.
Ws2 modelocked ultrafast fiber laser pubmed central pmc. This aircooled and turnkey cars laser source has a great benefit for the user as the fiber delivery eliminates alignment of the spatial and temporal pulse overlap. Swntcmc sa mode locked fiber laser mode locked laser performance of the cavity without the tbwf is first characterized. In addition, when the pump power is ramped up the laser modelocks initially with multiple pulses in the cavity.
Here, we present a simple and robust dualcomb system that employs a freerunning bidirectionally modelocked fiber laser operating at telecommunication wavelength. Stability analysis of mode locked figureeight fiber laser. Rp photonics encyclopedia modelocked lasers, ultrashort. The formation and stability of these 3d modelocked pulses is conceptually similar to 1d dissipative solitons and selfsimilar pulses in singlemode fiber 22, 23. The modelocked fiber laser can be selfstarting and has a longtime stability, and is expected to become seed sources for highpower ultrashort pulse laser. Zblan fiber laser, no modelocking output is observed if the graphene sample is placed between. Schematic of fiber mode locked femtosecond laser with free space mode locking components. Cw laser output is obtained when the pump power reaches 5. Modelocked laser article about modelocked laser by the. Free running dualcomb fiber laser mode locked by nonlinear multimode interference article pdf available in optics letters 4417. Background laser setup properties of the laser how to measure pulses autocorrelator design conclusions future work introduction. Pdf selfstarting ultrafast fiber lasers modelocked with.
In actively mode locked fiber lasers, as shown in fig. The first allfiber modelocked laser used erdoped fiber edf as a gain medium, with an operating wavelength of 1550 nm. Highenergy harmonic modelocked 2 m dissipative soliton fiber lasers nan yang, yulong tang and jianqiu xuhigh averagepeak power linearly polarized allfiber picosecond mopa seeded by modelocked noiselike pulses h l yu, p f ma, r m tao et al. The formation and stability of these 3d mode locked pulses is conceptually similar to 1d dissipative solitons and selfsimilar pulses in single mode fiber 22, 23. Pdf freestanding nanoscale graphite saturable absorber. The modulation frequency has to be very precisely tuned to the resonator roundtrip time. Fiberlaserbased frequency comb with a tunable repetition rate. An optical frequency comb tied to gps for laser frequencywavelength calibration. All polarizationmaintaining fiber laser architecture for. The observed modelocked pulse train has a 30 mhz repetition rate and an average power of 223 mw. Laser physics letters tunable hodoped soliton fiber laser mode locked by carbon nanotube saturable absorber to cite this article. A set of lenses consisting of planoconvex lens l 1 f 10 mm and aspheric lens l 2 f 12. The modelocking process is then described by the master equation tr. Breathing dissipative solitons in modelocked fiber lasers.
Compared with the passively mode locked pulse laser with gdysa or npr technology alone, the output pulse width of hybrid passively mode locked fiber laser is reduced more than 50 fs. Zblan fiber laser was pumped by a 970nm laser diode pigtailed to a 105 125. With a single transverse mode, lasing occurs in longitudinal eigenmodes, which correspond to different patterns of the electromagnetic lasing field along the length of the fiber a and resonant frequencies b. Laser quantum are the manufacturers of the torus mode locked slm lasers, with patented active mode locking technology to maintain the performance of the output beam, and a stable frequency output across wide temperature fluctuations and long measurement periods. We report on a novel architecture for robust modelocked femtosecond fiber lasers using a nonlinear optical loop mirror with all polarizationmaintaining fibers.
The output of a mode locked fiber laser depends strongly on the net dispersion of the laser cavity. Wavelength and pulse duration tunable ultrafast fiber laser. The spacing of the frequency comb is set by the lasers repetition rate, which can be scanned from. Probability density functions pdf for rms bandwidth see fig. Laser physics spatiotemporal modelocking in multimode. Here, we present a simple and robust dualcomb system that employs a free running bidirectionally modelocked fiber laser operating at telecommunication wavelength. Tunable sesambased modelocked soliton fiber laser in linear. We demonstrate an allfiber mode locked laser based on hybrid structure of multimode fiber saturable absorber sa that can realize both.
143 1519 812 762 1031 146 95 749 623 86 259 773 579 343 266 544 7 1022 1137 912 1006 858 1139 987 441 639 722 1496 507 1039 423 116 465 247 1204 864 1016 585 1478 1127 1068 1487 1109 423