Generation of 50-fs, 5-nJ pulses at 1.03 μm from a wave-breaking-free fiber laser (original) (raw)
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Applied Physics B, 2009
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Applied Physics B, 2012
We report on a systematic study of an environmentally stable mode-locked Yb-doped fiber laser operating in the chirped-pulse regime. The linear cavity chirped-pulse fiber laser is constructed with a saturable absorber mirror as nonlinear mode-locking mechanism and a nonlinearity-free transmission-grating-based stretcher/compressor for dispersion management. Mode-locked operation and pulse dynamics from strong normal to strong anomalous total cavity dispersion in the range of +2.5 to −1.6 ps 2 is experimentally studied. Strongly positively chirped pulses from 4.3 ps (0.01 ps 2) to 39 ps (2.5 ps 2) are obtained at normal netcavity dispersion. In the anomalous dispersion regime, the laser generates average soliton feature negatively chirped pulses with autocorrelation pulse durations from 0.8 ps (−0.07 ps 2) to 3.9 ps (−1.6 ps 2). The lowered peak power due to the pulse stretching allows one to increase the double pulse threshold. Based on the numerical simulation, different regimes of mode locking are obtained by varying the intra-cavity dispersion, and the characteristics of average
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We report an all-normal-dispersion, low-repetition-rate, high-energy, twin-pulse, passively mode locked ytterbium-doped fiber laser. The mode-locking mechanism of the laser is based on nonlinear polarization evolution and strong pulse shaping with a cascade long-period fiber grating bandpass filtering in a highly chirped pulse. The laser generates a highly stable twin-pulse group with 248 ps and 296 ps duration simultaneously and maximum pulse energy of 26:8 nJ-each pulse at a 2:5445 MHz repetition rate. Energy quantization is observed, which demonstrates the nonparabolic nature of these pulses. The laser can also work in third-harmonic mode locking with 17:8 nJ energy (at a repetition rate of 7:65 MHz and pulse width of 780 ps).
Pulse Shaping and Evolution in Normal-Dispersion Mode-Locked Fiber Lasers
IEEE Journal of Selected Topics in Quantum Electronics, 2000
Fiber lasers mode locked with large normal group-velocity dispersion have recently achieved femtosecond pulse durations with energies and peak powers at least an order of magnitude greater than those of prior approaches. Several new mode-locking regimes have been demonstrated, including self-similar pulse propagation in passive and active fibers, dissipative solitons, and a pulse evolution that avoids wave breaking at high peak power but has not been reproduced by theoretical treatment. Here, we illustrate the main features of these new pulse-shaping mechanisms through the results of numerical simulations that agree with experimental results. We describe the features that distinguish each new mode-locking state and explain how the interplay of basic processes in the fiber produces the balance of amplitude and phase evolutions needed for stable high-energy pulses. Dissipative processes such as spectral filtering play a major role in normaldispersion mode locking. Understanding the different mechanisms allows us to compare and contrast them, as well as to categorize them to some extent. energy, τ the pulse duration, β 2 the GVD coefficient, and n 2 the nonlinear index) holds.
Generation and scaling of highly-chirped dissipative solitons in an Yb-doped fiber laser
Laser Physics Letters, 2012
Generation of highly-chirped dissipative solitons (HCDS) in normal-dispersion cavity is treated now as a prospective technique to increase energy of femtosecond pulses delivered by an oscillator. Based on recently developed analytical model describing stable HCDS solutions, we have realized experimentally the regime of highly-chirped pulses in an Ybdoped fiber laser with passive mode locking via nonlinear polarization evolution (NPE) and tested the model predictions. It has been shown that the generated pulses satisfy the condition of equality for nonlinearity and dispersion induced phase shifts characterizing dissipative solitons, and their chirp parameter is growing nearly linearly with increasing cavity length. This results in nearly linear increase of the pulse energy, but the linear scaling is valid only up to some limit after which the stability of the regime is worsen significantly. At the limit length of ∼ 5 m the pulses with nJ energy level and several ps duration are generated being compressed to ∼ 200 fs out of the cavity. The reason of the stability break is shown to be an excessive rotation of polarization ellipse in the cavity, so it is proposed to use polarization-maintaining fibers to increase scaling range in HCDS regime obtained by means of NPE mode locking.
Ultrashort pulse formation and evolution in mode-locked fiber lasers
Applied Physics B, 2011
Passive mode-locking in fiber lasers is investigated by numerical and experimental means. A nondistributed scalar model solving the nonlinear Schrödinger equation is implemented to study the starting behavior and intra-cavity dynamics numerically. Several operation regimes at positive net-cavity dispersion are experimentally accessed and studied in different environmentally stable, linear laser configurations. In particular, pulse formation and evolution in the chirped-pulse regime at highly positive cavity dispersion is discussed. Based on the experimental results a route to highly energetic pulse solutions is shown in numerical simulations. 1 Introduction Lasers have been the subject of extensive research and development over the last 50 years, driven by their huge application potential. However, laser oscillators may be likewise
Generation of 2-nJ pulses from a femtosecond ytterbium fiber laser
Optics Letters, 2003
We report a mode-locked ytterbium fiber laser that generates femtosecond pulses with energies as large as 2.2 nJ. This represents a 20-fold improvement in pulse energy compared with that of previously reported femtosecond Yb fiber lasers. The laser produces pulses as short as 52 fs, which are to our knowledge the shortest pulses to date from a Yb fiber laser. The laser is diode pumped by a wavelength-division multiplexing coupler, which leads to excellent stability.