High-gain single-pass stimulated Raman scattering and four-wave mixing in a focused beam geometry: a numerical study

Schoulepnikoff, Laurent de; Mitev, Valentin

doi:10.1088/0963-9659/6/2/011

Cited by 12 publications

(2 citation statements)

References 31 publications

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“…The buffer gas increases the wave-vector mismatch thereby decreasing the FWM efficiency. 11,21 At active gas pressures of 6 -7 atm and buffer gas pressures of 5-6 atm, the Stokes beam quality was measured at an M 2 of 7. At these reduced pressures, there was a slight ͑ϳ5%͒ reduction in conversion efficiency from the peak.…”

Section: A Optimization Of Stokes Conversion Efficiency and Beam Quamentioning

confidence: 99%

Raman shifter optimized for lidar at a 15 μm wavelength

Spuler

Mayor

2007

Appl. Opt.

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A Raman shifter is optimized for generating high-energy laser pulses at a 1.54 microm wavelength. A forward-scattering design is described, including details of the multiple pass and nonfocused optical design, Stokes injection seeding, and internal gas recirculation. First-Stokes conversion efficiencies up to 43%--equivalent to 62% photon conversion efficiency--were measured. Experimental results show output average power in excess of 17.5 W, pulse energies of 350 mJ at 50 Hz, with good beam quality (M2<6). Narrow bandwidth and tunable output is produced when pumping with a single longitudinal mode Nd:YAG laser and seeding the process with a Stokes wavelength narrowband laser diode.

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Section: A Optimization Of Stokes Conversion Efficiency and Beam Quamentioning

confidence: 99%

Raman shifter optimized for lidar at a 15 μm wavelength

Spuler

Mayor

2007

Appl. Opt.

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“…In order to avoid this, other techniques must be used [1][2][3] . One such set of beam clean-up techniques is based on use of stimulated scattering processes [3][4][5][6][7][8] . Recent experiments demonstrated that high conversion efficiency can be achieved with Orientational Stimulated Scattering (OSS) in Nematic Liquid Crystals [9][10][11][12][13][14][15][16] (NLC).…”

Section: Introductionmentioning

confidence: 99%

Beam combining using orientational stimulated scattering in liquid crystals

et al. 2005

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Possibility of beam combining and clean-up using Orientational Stimulated Scattering in a Nematic Liquid Crystal is considered. We numerically study the dynamics of the process and find that back-conversion process tends to limit the effective interaction strength.Instability of the steady state of cross-phase modulation is demonstrated, when both waves have the same frequency. We show that high conversion efficiency can be achieved, and that the shape and wave-front of the amplified output signal are robust with respect to amplitude and phase distortions of the input pump.

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