1 September 2004 Numerical modeling of the intracavity stimulated Raman scattering as a source of subnanosecond optical pulses
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Abstract
We present a computer numerical model (virtual sub-nanosecond laser) utilizing intracavity stimulated Raman scattering. The goal of this work is to shorten laser output pulses (for which the highly nonlinear frequency conversion process stimulated Raman scattering is used) and to obtain high efficiency (which is enhanced by placing a Raman-active crystal inside the cavity where the fundamental laser frequency intensity is maximal). The following laser components were modeled: a diodepumped solidstate laser active medium (a crystal of the Nd3+:YLF type), a closed cavity for a wave on its fundamental frequency with a Q-switching element and an internal subcavity with a Ramanactive crystal with controlled output coupler transmission at the Raman frequency. The model components are: a numerical integrator of a set of three rate equations (for an inverse population of the laser medium and for the number of fundamental and Stokes frequency photons), random number sources for radiation seeding, and an interactive data input interface and graphic output. A wide range of parameters was investigated and output pulses as short as 0.8 ns were found. The optimal conditions for the maximal peak power of Stokes pulses were determined and the conditions for generating pulse trains for burst laser machining were identified.
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Yuri M. Yashkir, Yuri M. Yashkir, Yuriy Yu. Yashkir, Yuriy Yu. Yashkir, } "Numerical modeling of the intracavity stimulated Raman scattering as a source of subnanosecond optical pulses", Proc. SPIE 5460, Solid State Lasers and Amplifiers, (1 September 2004); doi: 10.1117/12.545045; https://doi.org/10.1117/12.545045
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