Showing papers on "Regenerative amplification published in 2022"
TL;DR: In this paper , a high-energy and high-power Yb:CALGO regenerative amplifier with 120 fs pulse width is reported, which can work with high stability in a large tuning range of repetition rates.
Abstract: The pulse energy and average power are two long-sought parameters of femtosecond lasers. In the fields of nonlinear-optics and strong-field physics, they respectively play the role to unlock the various nonlinear processes and provide enough photon fluxes. In this paper, a high-energy and high-power Yb:CALGO regenerative amplifier with 120 fs pulse width is reported. This high-performance regenerative amplifier can work with high stability in a large tuning range of repetition rates. Varying the repetition rate from 3 to 180 kHz, the maximum output power of 36 W and the pulse energy up to 4.3 mJ, corresponding to a peak power of more than 20 GW are demonstrated. The output beam is near diffraction limited with M2 = 1.09 and 1.14 on the horizontal and vertical directions, respectively. In addition, multi-plate compression is employed to achieve 30 fs output with 23 W average power which is attractive for applications such as high-harmonic generation.
4 citations
TL;DR: In this article , a seed laser with high beam quality and energy stability, based on a collinear optical parametric chirped pulse amplification (OPCPA) stage, was presented, delivering 46'µJ pulses with a 25'fs Fourier limit at 1'kHz repetition rate.
Abstract: Ultrafast laser pulses featuring both high spatio-temporal beam quality and excellent energy stability are crucial for many applications. Here, we present a seed laser with high beam quality and energy stability, based on a collinear optical parametric chirped pulse amplification (OPCPA) stage, delivering 46 µJ pulses with a 25 fs Fourier limit at 1 kHz repetition rate. While saturation of the OPCPA stage is necessary for achieving the highest possible energy stability, it also leads to a degradation of the beam quality. Using simulations, we show that spectrally dependent, rotationally symmetric aberrations dominate the collinear OPCPA in saturation. We experimentally characterize these aberrations and then remove distinct spatial frequencies to greatly improve the spectral homogeneity of the beam quality, while keeping an excellent energy stability of 0.2 % rms measured over 70 hours.
4 citations
TL;DR: In this article , a tabletop optical parametric chirped pulse amplification (OPCPA) system based on ZnGeP2 crystals was used to achieve a 16.5% overall efficiency.
Abstract: 3.2-mJ, 92-fs pulses centered at 3.1 µm are generated at a 1-kHz repetition rate through a tabletop optical parametric chirped pulse amplification (OPCPA) system based on ZnGeP2 crystals. Pumped by a 2-µm chirped pulse amplifier with a flat-top beam profile, the amplifier achieves a 16.5% overall efficiency, which, to the best of our knowledge, is the highest efficiency achieved by OPCPA at this wavelength. Harmonics up to the seventh order are observed after focusing the output in the air.
2 citations
01 May 2022
TL;DR: In this article , a Yb:CaYAlO4 (Yb:CYA) regenerative amplifier providing 135 fs output pulses with 1 mJ energy and 1 kHz repetition rate at 1040 nm.
Abstract: We report Yb:CaYAlO4 (Yb:CYA) regenerative amplifier providing 135 fs output pulses with 1 mJ energy and 1 kHz repetition rate at 1040 nm. Single Yb:crystal in TEM00 resonator was pumped by a diode laser.
2 citations
TL;DR: In this article , a 5 kHz sub-nanosecond master oscillator power amplifier (MOPA) was reported, which was an electro-optically Q-switched Nd:YVO4 laser directly pumped at 879 nm.
Abstract: A 5 kHz sub-nanosecond master oscillator power amplifier (MOPA) laser system was reported in this paper. The master oscillator was an electro-optically Q-switched Nd:YVO4 laser directly pumped at 879 nm, yielding a pulse energy of 520 µJ and a pulse width of 900 ps at 5 kHz. With two Nd:YVO4 amplifiers directly pumped at 914 nm, the pulse energy was further scaled up. Under the absorbed pump energy of 11.0 mJ, the pulse energy was amplified to 4.2 mJ, corresponding to a peak power of 4.7 MW. The optical-to-optical efficiency of the amplifiers reached 33.5%.
1 citations
TL;DR: In this article , a new scheme of picosecond optical parametric chirped pulse amplification (OPCPA) is presented, in which a Fourier transform-limit 5.0 ps pulse is optically sheared from a single longitudinal-mode 1064 nm CW laser.
Abstract: We present a new scheme of picosecond optical parametric chirped pulse amplification (OPCPA) in which a Fourier-transform-limit 5.0 ps pulse is optically sheared from a single-longitudinal-mode 1064 nm CW laser. The pulse is amplified and frequency-doubled as the pump in order to maintain the pump narrow bandwidth and picosecond duration simultaneously, which is very important to ensure the high temporal contrast for an OPCPA amplifier. Combined with the cross-polarized wave generation (XPW), a compound frontend for the high-power femtosecond laser system that delivers a 1 Hz chirped pulse train is established. The experiments provide an output pulse energy of 17.1 mJ, a spectrum bandwidth 71 nm (FWHM), and a pulse duration 16.4 fs. The pulse contrast reaches 1:10−12 several picoseconds before the peak of the main pulse, which is the best value of the available measuring instruments.
1 citations
01 May 2022
TL;DR: By optimizing the trigger pulse to the MZM, a dual-output laser operating at 100 W, 1 kHz repetition rate, compressed to the transform limit, was reported in this paper .
Abstract: Thin disk regenerative amplifiers have suitable characteristics to pump picosecond OPCPA. By optimizing the trigger pulse to the MZM, a dual-output laser operating at 100 W, 1 kHz repetition rate, compressed to the transform limit is reported.
01 Jan 2022
TL;DR: In this paper , a 1 kHz-900-fs Yb:YAG thin-disk regenerative amplifier with 50 mJ output power is presented. But the authors discuss how to address thermal issues in the Pockels cell to further increase the output energy up to 100 mJ.
Abstract: We report the development of a 1 kHz-900-fs Yb:YAG thin-disk regenerative amplifier delivering 50 mJ. We discuss how to address thermal issues in Pockels cell to further increase the output energy up to 100 mJ.
01 Jan 2022
TL;DR: By using a dual-chirped optical parametric amplification (DC-OPA) method and employing type-I BiBO crystal, this article obtained 102 mJ infrared pulses with spectrum centered at 1.7 µm.
Abstract: By using a dual-chirped optical parametric amplification (DC-OPA) method and employing type-I BiBO crystal, we obtained 102 mJ infrared pulses with spectrum centered at 1.7 µm and pulse duration 10.7 fs after compression.
01 Jan 2022
TL;DR: In this paper , an efficient diode-pumped high-power Yb:YLF amplifier with almost diffraction limited sub-1.5-ps pulses with 78% efficiency with energies up to 20 mJ and average powers above 250 W with 3% RMS noise was presented.
Abstract: We report an efficient diode-pumped high-power cryogenic Yb:YLF amplifier delivering almost diffraction limited sub-1.5-ps pulses with 78% efficiency with energies up to 20 mJ and average powers above 250 W with 3% RMS noise.
01 Jan 2022
TL;DR: In this article , a compact, cryogenic Yb:YAG regenerative amplifier that delivers >19mJ energy pulses at 1-kHz with near-TEM00 spatial profile is presented.
Abstract: We report a compact, cryogenic Yb:YAG regenerative amplifier that delivers >19-mJ energy pulses at 1-kHz with near-TEM00 spatial profile. The excellent power and pointing stabilities are ideal for OPCPA pumping over weeks-long continuous operation.
01 Jan 2022
TL;DR: In this paper , a dual-crystal optical parametric chirped pulse amplification scheme was proposed that is capable of maintaining sub-3-cycle pulse bandwidth when amplifying 2 μm pulses with 30 ps-long pulses from an Nd:YAG laser.
Abstract: We present a dual-crystal optical parametric chirped pulse amplification scheme that is capable of maintaining sub-3-cycle pulse bandwidth when amplifying 2 μm pulses with 30 ps-long pulses from an Nd:YAG laser. The concept is readily scalable to produce pulses with TW-level peak powers.
28 Dec 2022
TL;DR: In this paper , high-performance seed pulses with a spectrum ranging from 800 nm to 1050 nm and pulse energy of 86 μJ are generated based on the filtered multi-plate spectral broadening and spectral filtering from a Yb-based femtosecond laser system.
Abstract: To achieve multi-petawatt pulses, the generation of high-temporal-contrast few-cycle seed pulses with the central wavelength of 910 nm is the first step. In this research, high-performance seed pulses with a spectrum ranging from 800 nm to 1050 nm and pulse energy of 86 μJ are generated based on the filtered multi-plate spectral broadening and spectral filtering from a Yb-based femtosecond laser system. With self-phase modulation (SPM) induced spectral broadening, the input with relatively narrow spectrum bandwidth is broadened widely, which enables the final output pulse be compressed from full width at half maximum (FWHM) of 190 fs to 11.2 fs and a compression ratio of about 18 after dispersion compensation. The experiments show that the temporal contrast of the final output pulse is improved by at least four orders of magnitude through spectral filtering and new spectral components generated by third-order nonlinear processes such as SPM and self-focusing. Furthermore, taking advantage of single beam and self-focusing process, the final output has high energy stability and spectrum stability. Based on the merits above, together with its simplicity and robustness, this method proposed is expected to be used for the seed pulse generation of 10s-100s petawatt (PW) level laser system in the future.
01 Jan 2022
TL;DR: In this paper , a 1 kHz, Yb-based regenerative amplifier providing the ultimate 126 fs output pulses with 2.3 mJ of energy at 1039 nm, developed using a single disordered Yb:crystal-Yb:CaYAlO4 (Yb-CALYO).
Abstract: We report a 1 kHz, Yb-based regenerative amplifier providing the ultimate 126 fs output pulses with 2.3 mJ of energy at 1039 nm, developed using a single disordered Yb:crystal- Yb:CaYAlO4 (Yb:CALYO).
20 Jun 2022
TL;DR: In this paper , a diode-end-pumped 1047 nm N d: YLF laser based on a regenerative amplifier was developed, which produces 3 mJ 6 ns transform-limited pulses at 100 Hz with high beam quality.
Abstract: We developed a diode-end-pumped 1047 nm N d: YLF laser based on a regenerative amplifier which produces 3 mJ 6 ns transform-limited pulses at 100 Hz with high beam quality. The laser has a compact design and demonstrates excellent long-term stability of the output pulse.
01 Jan 2022
TL;DR: In this article , a generation of 265-fs millijoule pulses at 1940 nm from a solid-state regen-erative amplifier has been demonstrated, and the pulses have been used for pumping an ultrabroadband mid-infrared optical parametric amplifier.
Abstract: Generation of 265-fs millijoule pulses at 1940 nm from a solid-state regen-erative amplifier has been demonstrated. The pulses have been used for pumping an ultrabroadband mid-infrared optical parametric amplifier.
01 Jan 2022
TL;DR: In this article , the authors report a robust long-term stable >19mJ energy, 1kHz repetition rate cryogenic Yb:YAG regenerative amplifier and its application in pumping a mJ-class, 3µm wavelength OPCPA.
Abstract: We report a robust long-term stable >19mJ energy, 1kHz repetition rate cryogenic Yb:YAG regenerative amplifier and its application in pumping a mJ-class, 3µm wavelength OPCPA. We highlight the benefits of cryo-Yb:YAG over alternative systems.
TL;DR: In this article , a 38-fs chirped-pulse amplified (CPA) Ti:sapphire laser system with an average output power of 1.45 W at a repetition rate of 1 kHz, corresponding to peak power of 38 GW, was presented.
Abstract: We experimentally demonstrate a 38-fs chirped-pulse amplified (CPA) Ti:sapphire laser system based on the power-scalable thin-disk scheme with an average output power of 1.45 W at a repetition rate of 1 kHz, corresponding to peak power of 38 GW. The beam profile close to the diffraction limit with a measured M2 value of approximately 1.1 is obtained. It demonstrates the potential for an ultra-intense laser with high beam quality compared with the conventional bulk gain amplifier. To the best of our knowledge, this is the first reported Ti:sapphire regenerative amplifier based on the thin-disk approach reaching 1 kHz.