scholarly journals Spatiotemporal characterization of laser pulse amplification in double-pass active mirror geometry

2020 ◽  
Vol 8 ◽  
Author(s):  
Tinghao Liu ◽  
Qiang Liu ◽  
Zhan Sui ◽  
Mali Gong ◽  
Xing Fu
Keyword(s):  
High Energy ◽  
Double Pass ◽  
Spatiotemporal Model ◽  
Laser Amplifiers ◽  
Pulse Amplification ◽  
Pulse Distortion ◽  
Energy Pulse ◽  
Active Mirror ◽  
First Time

Abstract We present a spatiotemporal model of pulse amplification in the double-pass active mirror (AM) geometry. Three types of overlap condition are studied, and the spatiotemporal scaling under the four-pulse overlapping (4PO) condition is fully characterized for the first time, by mapping the temporal and spatial segments of beam to the instantaneous gain windows. Furthermore, the influence of spatiotemporal overlaps on the amplified energy, pulse distortion and intensity profile is unraveled for both AM and zigzag configurations. The model, verified by excellent agreement between the predicted and measured results, can be a powerful tool for designing and optimizing high energy multi-pass solid-state laser amplifiers with AM, zigzag and other geometries.

scholarly journals Scaling diode-pumped, high energy picosecond lasers to kilowatt average powers

2018 ◽  
Vol 6 ◽  
Author(s):  
Brendan A. Reagan ◽  
Cory Baumgarten ◽  
Elzbieta Jankowska ◽  
Han Chi ◽  
Herman Bravo ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Average Power ◽  
High Energy ◽  
High Repetition Rate ◽  
Full Characterization ◽  
High Repetition ◽  
Diode Pumped ◽  
Picosecond Lasers ◽  
Active Mirror

Recent results in the development of diode-driven high energy, high repetition rate, picosecond lasers, including the demonstration of a cryogenic Yb:YAG active mirror amplifier that produces 1.5 J pulses at 500 Hz repetition rate (0.75 kW average power) are reviewed. These pulses are compressed resulting in the generation of ${\sim}5~\text{ps}$ duration, 1 J pulses with 0.5 kW average power. A full characterization of this high power cryogenic amplifier, including at-wavelength interferometry of the active region under ${>}1~\text{kW}$ average power pump conditions, is presented. An initial demonstration of operation at 1 kW average power (1 J, 1 kHz) is reported.

Modeling and optimizing of low-repetition-rate high-energy pulse amplification in high-concentration erbium-doped fiber amplifiers

2009 ◽  
Vol 282 (17) ◽  
pp. 3577-3582 ◽  
Author(s):  
Jianfeng Li ◽  
Zhiyong Dai ◽  
Zhonghua Ou ◽  
Lixun Zhang ◽  
Yongzhi Liu ◽  
...  
Keyword(s):  
Repetition Rate ◽  
High Energy ◽  
Fiber Amplifiers ◽  
High Concentration ◽  
Pulse Amplification ◽  
Erbium Doped ◽  
Energy Pulse

High-energy pulse amplification in partly quenched highly Er3+-doped fiber

2018 ◽  
Author(s):  
Pablo G. Rojas Hernández ◽  
Colin Baker ◽  
Shankar Pidishety ◽  
Mohammad Belal ◽  
Yutong Feng ◽  
...  
Keyword(s):  
High Energy ◽  
Pulse Amplification ◽  
Energy Pulse

Theoretical and optimized design of low-repetition-rate high-energy pulse amplification in multi-stage MOPA systems

2010 ◽  
Vol 12 (11) ◽  
pp. 115710 ◽  
Author(s):  
Jianfeng Li ◽  
Hao Chen ◽  
Yu Chen ◽  
Ming Chen ◽  
Yi Yang ◽  
...  
Keyword(s):  
Repetition Rate ◽  
High Energy ◽  
Optimized Design ◽  
Pulse Amplification ◽  
Multi Stage ◽  
Energy Pulse

Multifilament-core fibers for high energy pulse amplification at 15 μm with excellent beam quality

2008 ◽  
Vol 33 (22) ◽  
pp. 2701 ◽  
Author(s):  
G. Canat ◽  
S. Jetschke ◽  
S. Unger ◽  
L. Lombard ◽  
P. Bourdon ◽  
...  
Keyword(s):  
Beam Quality ◽  
High Energy ◽  
Pulse Amplification ◽  
Energy Pulse

scholarly journals High-resolution X-ray absorption spectroscopy as a probe of crystal-field and covalency effects in actinide compounds

2016 ◽  
Vol 113 (29) ◽  
pp. 8093-8097 ◽  
Author(s):  
Sergei M. Butorin ◽  
Kristina O. Kvashnina ◽  
Johan R. Vegelius ◽  
Daniel Meyer ◽  
David K. Shuh
Keyword(s):  
Absorption Spectroscopy ◽  
Ground State ◽  
High Energy ◽  
High Energy Resolution ◽  
Crystalline Electric Field ◽  
X Ray ◽  
Anderson Impurity Model ◽  
First Time ◽  
X Ray Absorption

Applying the high-energy resolution fluorescence-detection (HERFD) mode of X-ray absorption spectroscopy (XAS), we were able to probe, for the first time to our knowledge, the crystalline electric field (CEF) splittings of the5fshell directly in the HERFD-XAS spectra of actinides. Using ThO2as an example, data measured at the Th 3dedge were interpreted within the framework of the Anderson impurity model. Because the charge-transfer satellites were also resolved in the HERFD-XAS spectra, the analysis of these satellites revealed that ThO2is not an ionic compound as previously believed. The Th6doccupancy in the ground state was estimated to be twice that of the Th5fstates. We demonstrate that HERFD-XAS allows for characterization of the CEF interaction and degree of covalency in the ground state of actinide compounds as it is extensively done for 3dtransition metal systems.

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