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35 fs, all-polarization-maintaining MOPA laser system
摘要： We have experimentally observed ultrashort pulse in a simple, all-polarization-maintaining fiber, master oscillator and power amplifier laser. A semiconductor saturable mirror (SESAM) module is used as the mode locker. The ultrashort pulse exhibits perfect Gaussian spectrum without any fine structure. The 20 dB pulse spectral width is 28 nm, and the pulse duration directly output from the oscillator is 268.6 fs. Via a two-stage amplifier, the pulse spectrum is greatly broadened to 43 nm, and the pulse duration lengths to 0.9 ps. Moreover, after compression, a typical saddle-shaped spectrum appears and the spectral bandwidth broadens to 121 nm; the pulse duration is compressed to ~35 fs with a pulse peak power of 22.79 kW, which is high enough to stimulate a one-octave supercontinuum spectrum. Due to the polarization-maintaining structure and high reliability of SESAM, the whole system exhibits strong environmental stability. Experimental observation reveals that such a fiber laser with a very simple structure exhibits excellent performance, and could be applied in the area of optical frequency comb.
关键词： ultrafast fiber lasers,pulse propagation and temporal solitons,pulse compression
更新于2025-09-16 10:30:52
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Stability of out-of-phase solitons and laser pulse self-compression in active multicore fibers
摘要： An out-of-phase soliton distribution of the wave ?eld is found for a multicore ?ber (MCF) from an even number of cores located in a ring. Its stability is proved with respect both to small wave-?eld perturbations, including azimuthal ones, and to small deformations of the MCF structure. As an example of using this soliton distribution, the problem of laser pulse compression in an active MCF is studied. The optimal ?ber parameters, the minimum duration of the output pulse, and the compression length are found, and they are in good agreement with the results of numerical simulation. In order to achieve high energies in the output laser pulse, the requirements for MCF deformations are determined.
关键词： fiber optics,laser pulse compression,soliton,multicore fiber,nonlinear optics
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Sub-20 fs ? 10.5 W Visible Pulse Generation from Yb-Doped Fiber Laser
摘要： High-power high-repetition rate femtosecond ytterbium-doped fiber lasers offer new perspectives in femtochemistry, solid-state physics and strong field physics. In particular, high-order harmonic generation (HHG) driven by Yb-fiber laser has demonstrated high photons flux in extreme ultraviolet (XUV) spectral range [1,2]. Shortening the laser pulse improves the achievable time resolution in pump-probe experiments and also the efficiency and the spectral extent of HHG (cutoff wavelength). However, the gain bandwidth of the Yb:fiber limits the pulse duration in the 250 fs - 130 fs range. To solve this issue, nonlinear pulse compression experiments using Yb:fiber lasers have been carried out at the fundamental wavelength (1030 nm) to downscale the pulse duration in the 10 fs range [3,4]. On the other hand, so far the highest reported XUV photons flux up to milliwatt-class has been obtained at 515 nm driving wavelength with 11W - 85 fs pulses [5]. While frequency doubling an ultrashort (< 30 fs) pulse requires a trade-off between efficiency and pulse duration lengthening, we present in this work an efficient and high power sub-20 fs visible laser source based on the second harmonic generation (SHG) of a high energy Yb-doped femtosecond fiber laser followed by a nonlinear compression stage in a krypton-filled capillary.
关键词： femtosecond ytterbium-doped fiber lasers,nonlinear pulse compression,krypton-filled capillary,second harmonic generation,high-order harmonic generation
更新于2025-09-16 10:30:52
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SRS converter – compressor of femtosecond ytterbium laser pulses
摘要： Stimulated Raman scattering (SRS) conversion of femtosecond pulses of an ytterbium laser at a wavelength of 1.03 mm is performed in compressed hydrogen under conditions of nonlinear phase modulation. Temporal compression of frequency-chirped Stokes pulses is carried out, as a result of which 400-fs laser pulses are converted into 27-fs Stokes pulses with a wavelength of 1.8 mm. An average Stokes power of 0.6 W is implemented at an average laser power of 6.3 W and a pulse repetition rate of 20 kHz.
关键词： femtosecond laser,pulse compression,stimulated Raman scattering,nonlinear phase modulation
更新于2025-09-16 10:30:52
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Compression of laser pulses by near-forward Raman amplification in plasma
摘要： We propose a new scheme for compression of ultrashort laser pulses enabled by Near-Forward Raman Ampli?cation (NFRA) in plasma. In contrast to traditional forward Raman ampli?cation in plasma, the seed pulse in NFRA propagates faster than the pump through manipulation of the spatiotemporal properties of the pump beam. A “p-pulse” solution similar to that of stimulated Raman backscattering ampli?cation is obtained, indicating that NFRA can be used for compression of ultrashort laser pulses. NFRA is numerically demonstrated with a 2D simulation using a front-tilt near-forward pump pulse.
关键词： Raman amplification,plasma,laser pulses,pulse compression
更新于2025-09-16 10:30:52
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Ultrafast Pulse Manipulation in Dispersion-Flattened Waveguides With Four Zero-Dispersion Wavelengths
摘要： On-chip formation and manipulation of ultrashort pulses would be of great interest to ultrafast optics and integrated photonics communities. One of key issues is dispersion-assisted nonlinear interactions of broadband frequency components. In this paper, we show for the first time that a bilayer waveguide for quasi-TE mode without using a slot produces a quite flat and saddle-shaped dispersion profile. Different from previously reported TE-mode waveguides with flattened dispersion, the proposed waveguide exhibits a greatly simplified structure with no need for a high-aspect-ratio slot and has quite small group delay difference in a wide spectral range with four zero-dispersion wavelengths (ZDWs). We study supercontinuum generation in hybrid dispersion regime for the first time, in which the broadened spectrum covers a bandwidth with all ZDWs. It is found that one can obtain greatly improved spectral flatness in supercontinuum generation, with a power variation as small as 3 dB over a bandwidth of >500 nm. Moreover, the proposed waveguides are particularly suitable for low-distortion pulse propagation over a long distance, which is important for on-chip ultrashort pulse delivery.
关键词： Dispersion engineering,pulse compression,waveguide,supercontinuum generation
更新于2025-09-12 10:27:22
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Laser ranging with analog all-optical coherent pulse compression
摘要： We propose and demonstrate a simple experimental platform that enables ranging by optical coherent pulse compression. Our system, based on a frequency shifting loop, is particularly simple and involves only a single CW laser and standard telecom components. It does not require fast electronic systems, since the pulse compression is realized in a purely analog way, by the beating between two sequences of optical chirped waveforms with the same chirp rate, but slightly different repetition rates. We demonstrate a range resolution in the centimeter range set by the bandwidth of the optical chirps, 24 GHz, and a time-bandwidth product of 300, with a detection bandwidth of only a few tens of MHz.
关键词： pulse compression,Lidar,ranging,chirps
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Joule-Class 500 Hz Cryogenic Yb:YAG Chirped Pulse Amplifier
摘要： A cryogenic solid-state laser (CSSL) based on a chromium-doped gadolinium scandium gallium garnet (Cr:GSGG) crystal has been demonstrated. The laser operates at 1.94 μm with a maximum output power of 1.1 W at 100 K. The output pulses (FWHM 1.24 ns) may be compressed to 31 ps. The current state of art in cryogenic solid-state lasers is presented, and the advantages of the CSSL are discussed.
关键词： solid-state laser,1.94 μm,cryogenic,pulse compression,Cr:GSGG
更新于2025-09-12 10:27:22
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Stable Low-Repetition-Rate Time-Lens Picosecond Seed Source
摘要： The design and performance of a sub-10-picosecond source based on temporal focusing implemented with a lithium niobate phase modulator and a grating compressor are presented. The source is optimized taking into account spectral gain narrowing in subsequent amplifiers. It advantageously delivers low-repetition-rate pulses with tunable pulse duration, and its short-term jitter and long-term drift over extended periods of time are of the order of a few picoseconds.
关键词： Chromatic dispersion,pulse compression methods,phase modulation,optical pulse generation
更新于2025-09-11 14:15:04
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Soliton-effect optical pulse compression in CMOS-compatible ultra-silicon-rich nitride waveguides
摘要： The formation of optical solitons arises from the simultaneous presence of dispersive and nonlinear properties within a propagation medium. Chip-scale devices that support optical solitons harness high field confinement and flexibility in dispersion engineering for significantly smaller footprints and lower operating powers compared to fiber-based equivalents. High-order solitons evolve periodically as they propagate and experience a temporal narrowing at the start of each soliton period. This phenomenon allows strong temporal compression of optical pulses to be achieved. In this paper, soliton-effect temporal compression of optical pulses is demonstrated on a CMOS-compatible ultra-silicon-rich nitride (USRN) waveguide. We achieve 8.7× compression of 2 ps optical pulses using a low pulse energy of ～16 pJ, representing the largest demonstrated compression on an integrated photonic waveguide to date. The strong temporal compression is confirmed by numerical calculations of the nonlinear Schr?dinger equation to be attributed to the USRN waveguide’s large nonlinearity and negligible two-photon absorption at 1550 nm.
关键词： ultra-silicon-rich nitride,nonlinear Schr?dinger equation,pulse compression,optical solitons,CMOS-compatible
更新于2025-09-11 14:15:04