KEYWORDS: Laser radiation, Laser development, Temperature distribution, Optical path differences, High power lasers, Wavefront distortions, Cryogenics, Laser systems engineering
The work is devoted to the investigation of gain complex dependency on the pump radiation parameters. The dependencies of the pulse energy gain and the parameters of the amplified radiation on the parameters of the pump radiation in the amplifying cascade based on Yb:YAG active elements are experimentally studied. Small-signal gain with the magnitude of 19 was reached in three consecutive active elements with good beam quality and high pointing stability. A method is proposed for simultaneous experimental investigation of temperature and gain coefficient distributions. Thermal contribution to optical path difference is about 3 wavelengths of amplified radiation while the electronic contribution is 100 times smaller.
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.
A numerical simulation of the generation of supercontinuum (SC) in highly-nonlinear photonic crystal fibre pumped with picoseconds-long pulses has been done using the RK4IP algorithm. Simulation and experimental results are in good agreement. The supercontinuum will be used for further amplification.
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