scholarly journals Yb:CALYO-based femtosecond chirped pulse regenerative amplifier for temporally resolved pump-probe spectroscopy

2018 ◽  
Vol 9 (3) ◽  
pp. 205-214 ◽  
Author(s):  
A. S. Rudenkov ◽  
V. E. Kisel ◽  
A. S. Yasukevich ◽  
K. L. Hovhannesyan ◽  
A. G. Petrosyan ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Broad Band ◽  
Spectral Width ◽  
Seed Pulse ◽  
Regenerative Amplifier ◽  
Chirped Pulse ◽  
Gain Narrowing ◽  
Compensation Technique

Diode-pumped femtosecond chirped pulse regenerative amplifiers based on Yb3+-materials are of practical importance for wide range of scientific, industrial and biomedical applications. The aim of this work was to study the amplification of broadband chirped femtosecond pulses in regenerative amplifier based on Yb3+:CaYAlO4crystal.Such systems use femtosecond mode-locked lasers as seed pulse sources and amplify nJ-seed pulses to sub-mJ energy range. Most chirped pulse regenerative amplifier systems described in the literature use seed lasers with typical pulse spectral width at the level of 10–15 nm full width at half maximum (FWHM) that limit the seed pulse duration of about 90 fs and amplified pulse duration at the level of 200 fs due to strong influence of gain narrowing effect on the amplified pulse parameters. Yb3+-doped crystals with wide and smooth gain bandwidth as an active medium of chirped femtosecond pulse regenerative amplification systems allow to reduce negative contribution of gain narrowing effect and lead to shortening of amplified pulses. In this research we study the chirped pulse regenerative amplification of broad-band femtosecond pulses (60 nm spectral width FWHM) in the Yb3+:CaYAlO -based chirped pulse regenerative amplifier. Substantial reduction of the amplified pulse duration down to 120 fs (19.4 nm spectral width FWHM) with average power of 3 W at 200 kHz pulse repetition frequency was demonstrated without any gain narrowing compensation technique.The results of experimental investigation of broad-band seeded Yb3+:CaYAlO -based chirped pulse regenerative amplifier are reported for the first time to our knowledge. 120 fs-pulses (19.4 nm FWHM) with average output power of 3 W were demonstrated without any gain narrowing compensation technique. Despite the significant reduction of amplified pulse duration the task of improvement group velocity dispersion balance (including high orders of group velocity dispersion) remains relevant.

Group-velocity dispersion in chirped-pulse amplifier

1996 ◽  
Vol 5 (10) ◽  
pp. 769-780
Author(s):  
Shen Yu-zhen ◽  
Xing Qi-rong ◽  
Shi Ji-ying ◽  
Wang Qing-yue
Keyword(s):  
Group Velocity ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Chirped Pulse ◽  
Pulse Amplifier

scholarly journals A Yb:KGW dual-crystal regenerative amplifier

2020 ◽  
Vol 8 ◽  
Author(s):  
Huijun He ◽  
Jun Yu ◽  
Wentao Zhu ◽  
Xiaoyang Guo ◽  
Cangtao Zhou ◽  
...  
Keyword(s):  
Laser System ◽  
Regenerative Amplifier ◽  
Chirped Pulse ◽  
Pulse Amplification ◽  
Front End ◽  
Chirped Pulse Amplification ◽  
Gain Narrowing ◽  
Diode Pumped ◽  
Cavity Design ◽  
Output Laser

Abstract This study develops a Yb:KGW dual-crystal based regenerative amplifier. The thermal lensing and gain-narrowing effects are compensated by the dual-crystal configuration. Sub-nanojoule pulses are amplified to 1.5 mJ with 9 nm spectral bandwidth and 1 kHz repetition rate using chirped pulse amplification technology. Consequently, 1.2 mJ pulses with a pulse duration of 227 fs are obtained after compression. Thanks to the cavity design, the output laser was a near diffraction limited beam with M2 around 1.1. The amplifier has the potential to boost energy above 2 mJ after compression and act as a front end for a future kilohertz terawatt-class diode-pumped Yb:KGW laser system.

Broad-band seeded chirped pulse Yb:CALYO regenerative amplifier

2017 ◽  
Author(s):  
Alexander Rudenkov ◽  
Viktor Kisel ◽  
Anatol Yasukevich ◽  
Karine Hovhannesyan ◽  
Ashot Petrosyan ◽  
...  
Keyword(s):  
Broad Band ◽  
Regenerative Amplifier ◽  
Chirped Pulse

scholarly journals Broad-band moment tensor inversion from single station, regional surface waves for the 1990, NW-Iran earthquake sequence

1994 ◽  
Vol 37 (6) ◽  
Author(s):  
D. Giardini ◽  
L. Malagnini ◽  
B. Palombo ◽  
E. Boschi
Keyword(s):  
Seismic Moment ◽  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Moment Tensor ◽  
Broad Band ◽  
Earthquake Sequence ◽  
Lithospheric Structure ◽  
Nw Iran ◽  
Single Station ◽  
Large Earthquakes

e present a method for the inversion of complete waveforms in the 5-30 mHz frequency band for moment tensor determination. The method is based on the calibration of phase and group velocity dispersion curves for Rayleigh and Love fundamental modes to account for heterogeneous lithospheric structure, and is applied to the analysis of single station records of the VSL MEDNET station for the 1990 NW Iran earthquake sequence (the events of June 20, 21 and 24). The revised seismic moment of the June 20, 1990 Iranian earthquake is Mo = 1.56 x 1027 dyne-cm, corresponding to Mw = 7.4. The method proves to be a very robust tool for the analysis of moderate and large earthquakes at regional distances, producing consistent moment tensor solutions trom single station inversions in narrow (2-4 mHz) and wide (up to 20 mHz) frequency bands across the whole band of interest.

scholarly journals Tracing interactions in HCGs through the H I

2000 ◽  
Vol 174 ◽  
pp. 167-173 ◽  
Author(s):  
L. Verdes-Montenegro ◽  
M. S. Yun ◽  
B. A. Williams ◽  
W. K. Huchtmeier ◽  
A. Del Olmo ◽  
...  
Keyword(s):  
Velocity Dispersion ◽  
Group Velocity Dispersion ◽  
Dynamical Evolution ◽  
Compact Groups ◽  
High Group ◽  
X Ray ◽  
Hot Gas ◽  
Isolated Galaxies ◽  
Global Study ◽  
Hickson Compact Groups

AbstractWe present a global study of Hɪ spectral line mapping for 16 Hickson Compact Groups (HCGs) combining new and unpublished VLA data, plus the analysis of the Hɪ content of individual galaxies. Sixty percent of the groups show morphological and kinematical signs of perturbations (from multiple tidal features to concentration of the Hɪ in a single enveloping cloud) and sixty five of the resolved galaxies are found to be Hɪ deficient with respect to a sample of isolated galaxies. In total, 77% of the groups suffer interactions among all its members which provides strong evidence of their reality. We find that dynamical evolution does not always produce Hɪ deficiency, but when this deficiency is observed, it appears to correlate with a high group velocity dispersion and in some cases with the presence of a first-ranked elliptical. The X-ray data available for our sample are not sensitive enough for a comparison with the Hɪ mass; however this study does suggest a correlation between Hɪ deficiency and hot gas since velocity dispersions are known from the literature to correlate with X-ray luminosity.

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