Preservation of Good Beam Quality over Several Hundred Meters in Highly Multimode Fibers

2018 ◽  
Author(s):  
Christian Röhrer ◽  
Christophe Codemard ◽  
Götz Kleem ◽  
Marwan Abdou Ahmed ◽  
Thomas Graf
Keyword(s):  
Beam Quality ◽  
Multimode Fibers ◽  
Good Beam Quality

scholarly journals Design and experimental demonstration of a high conversion efficiency OPCPA pre-amplifier for petawatt laser facility

2018 ◽  
Vol 6 ◽  
Author(s):  
Xiao Liang ◽  
Xinglong Xie ◽  
Jun Kang ◽  
Qingwei Yang ◽  
Hui Wei ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Nonlinear Crystal ◽  
Beam Quality ◽  
Pump Energy ◽  
High Conversion ◽  
Signal Pulse ◽  
High Conversion Efficiency ◽  
Optical Parametric ◽  
Good Beam Quality ◽  
Laser Facility

We present the design and experiment of a broadband optical parametric chirped-pulse amplifier (OPCPA) which provides high conversion efficiency and good beam quality at 808 nm wavelength. Using a three-dimensional spatial and temporal numerical model, several design considerations necessary to achieve high conversion efficiency, good beam quality and good output stability are discussed. To improve the conversion efficiency and broaden the amplified signal bandwidth simultaneously, the nonlinear crystal length and OPCPA parameters are analyzed and optimized with the concept of dissipating amplified idler between optical parametric amplification (OPA) of two crystals configuration. In the experiment, an amplifier consisting of two OPCPA stages of ‘L’ type configuration was demonstrated by using the optimized parameters. An amplified signal energy of 160 mJ was achieved with a total pump-to-signal efficiency of 35% (43% efficiency for the OPCPA stage 2). The output bandwidth of signal pulse reached 80 nm and the signal pulse was compressed to 24 fs. The energy stability reached 1.67% RMS at 3% pump energy variation. The optimized OPCPA amplifier operates at a repetition rate of 1 Hz and is used as a front-end injection for the main amplifier of SG-II 5PW laser facility.

Valley density profile for highly efficient x-ray lasers with good beam quality

2007 ◽  
Vol 32 (5) ◽  
pp. 491 ◽  
Author(s):  
J. Zhao ◽  
Q. L. Dong ◽  
J. Zhang
Keyword(s):  
Density Profile ◽  
Beam Quality ◽  
X Ray ◽  
Highly Efficient ◽  
Good Beam Quality

A High-Energy Good-Beam-Quality Krypton-Lamp-Pumped Nd:YAG Solid-State Laser with One Pump Cavity

2008 ◽  
Vol 25 (2) ◽  
pp. 521-523 ◽  
Author(s):  
Liu Xue-Sheng ◽  
Wang Zhi-Yong ◽  
Yan Xin ◽  
Cao Ying-Hua
Keyword(s):  
Solid State ◽  
Beam Quality ◽  
High Energy ◽  
Solid State Laser ◽  
State Laser ◽  
Good Beam Quality ◽  
Pump Cavity

High Energy, High Efficiency Nd: Glass Regenerative Amplifier

2012 ◽  
Vol 529 ◽  
pp. 105-109 ◽  
Author(s):  
X.F. Wang ◽  
Z.W. Fan ◽  
J. Yu ◽  
Z.H. Shi ◽  
T.Z. Zhao ◽  
...  
Keyword(s):  
Pulse Energy ◽  
High Efficiency ◽  
Beam Quality ◽  
High Energy ◽  
Gain Medium ◽  
Small Scale ◽  
Regenerative Amplifier ◽  
Amplification Ratio ◽  
Focusing Effect ◽  
Good Beam Quality

To obtain high energy, high efficiency Nd: glass preamplifier used in certain host device, a Nd:glass regenerative amplifier system has been designed. By adjusting the single pass gain and carefully optimizing the cavity mode, the small-scale self-focusing effect in the gain medium was effectively controlled. Maximum pulse energy of 21mJ, pulse width of 2.6ns was obtained at the repetition frequency of 1Hz, corresponding to a high optical to optical conversion efficiency of 11% and amplification ratio of 108. The pulse to pulse energy stability was < 2% rms during 2 h continous operation. The laser has a good beam quality of M2=1.5. The spectrum was measured to be at center wavelength of 1052.915nm.

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