Revealing multi-pulse four-wave Bragg spatial solitons in periodic square-law nonlinear crystal with direct transitions

We numerically simulate the evolution of the dark-notch-bearing optical beam in the logarithmically saturable nonlinear media based on beam propagation method (BPM). The simulation results indicate that the multiple dark spatial solitons are deep, possible in this type of nonlinear media. The number of multiple dark spatial solitons depends on the width of the dark notch, the initial conditions and the peak intensity of the initial input beam. Under the odd and even initial conditions, the odd and even number sequence of multiple dark spatial solitons can be obtained, respectively. For an input beam with fixed optical intensity, the number of dark solitons increases with the width of the initial input dark notch. The behavior of the multiple dark solitons in this type of media is similar to that in a photorefractive nonlinear crystal.

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Arrays to Support Spatial Solitons. DoD - MURI Fellowship, April 2, 2000 to April 1, 2004

10.21236/ada428593 ◽

2004 ◽

Author(s):

George Stegeman ◽

Greg Salamo

Keyword(s):

Spatial Solitons

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

High Power Laser Science and Engineering ◽

10.1017/hpl.2018.52 ◽

2018 ◽

Vol 6 ◽

Cited By ~ 7

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.

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