Control of the amplifications of large-band amplitude-modulated pulses in an Nd-glass amplifier chain

Laurent Videau; Emmanuel Bar; Claude Rouyer; Claude Gouedard; Josselin C. Garnier; Arnold Migus

doi:10.1117/12.354243

23 July 1999 Control of the amplifications of large-band amplitude-modulated pulses in an Nd-glass amplifier chain

Laurent Videau, Emmanuel Bar, Claude Rouyer, Claude Gouedard, Josselin C. Garnier, Arnold Migus

Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354243
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

Abstract

We study nonlinear effects in amplification of partially coherent pulses in a high power laser chain. We compare statistical models with experimental results for temporal and spatial effects. First we show the interplay between self-phase modulation which broadens spectrum bandwidth and gain narrowing which reduces output spectrum. Theoretical results are presented for spectral broadening and energy limitation in case of time-incoherent pulses. In a second part, we introduce spatial incoherence with a multimode optical fiber which provides a smoothed beam. We show with experimental result that spatial filter pinholes are responsible for additive energy losses in the amplification. We develop a statistical model which takes into account the deformation of the focused beam as a function of B integral. We estimate the energy transmission of the spatial filter pinholes and compare this model with experimental data. We find a good agreement between theory and experiments. As a conclusion, we present an analogy between temporal and spatial effects with spectral broadening and spectral filter. Finally, we propose some solutions to control energy limitations in smoothed pulses amplification.

Citation Download Citation

Laurent Videau, Emmanuel Bar, Claude Rouyer, Claude Gouedard, Josselin C. Garnier, and Arnold Migus "Control of the amplifications of large-band amplitude-modulated pulses in an Nd-glass amplifier chain", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354243

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