The numerical three-dimensional non-stationary model based on balance equations and the thermal conductivity equation was used to study the dynamic of laser amplification process in Yb:YAG media. Characteristic curves for gain and optical phase difference are obtained, and it is shown that it is possible to minimize wavefront aberrations in amplified radiation while keeping high gain coefficient by choosing optimal pump parameters. Transversal doping profiles are proposed for decreasing of losses arising from amplified stimulated emission.
This paper is focused on the investigation of the effect of temperature on the laser amplification process. In case of Ybdoped active media there is a significant dependency of laser and physical properties on temperature that leads to reducing of gain coefficient. Theoretical description and experimental study carried out based on Yb:YAG crystal pumped by high power laser diode. Despite the cooling of the active element, the heating significantly affects at cwpumping regime and determines the shape of gain coefficient dependency on the pump power.
To supress beam pointing instabilities after high power laser multipass amplifier with cryogenic closed-loop cooling the copper heatsinks were optimized. Active elements’ temperature dependency on diode pump regimes is measured. The alternative seed laser for the high power laser multipass amplifier with cryogenic closed-loop cooling was modeled and designed.
The stabilization system implemented has allowed one to achieve phase residual instability ~0.17 radian (rms) for the 30 fs-pulse, which is sufficient for nonlinear interaction radiation with optical medium in forthcoming lightwave electronics experiments.
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