30 September 1996 Investigation of absorption saturation in diode end-pumped microchip lasers
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Two sorts of microchip laser materials, such as Nd:YVO4 and Er/Yb:Cr phosphate Kigre glass, are used to perform the experimental study of pump absorption saturation. A spatial- dependent rate equation model has been developed for the simulation, and hence the corresponding absorption saturation intensities are determined, the pump saturation intensity is 840 W/cm2 in the (pi) -polarization, and 2200 W/cm2 in the (sigma) -polarization for the 3% a-cut Nd:YVO4 crystal for the 810 nm pump wavelength, and 130 kW/cm2 for Er/Yb:Cr phosphate Kigre glass for the 975 nm pump wavelength. Based on this nonlinear absorption effect, a high performance LD end-pumped Nd:YVO4 microchip laser was obtained with a low pump threshold of 3 mW and a high slope efficiency of 50%, while for Er/Yb:Cr phosphate Kigre glass laser, a low pump threshold of 5 mW and 20% slope efficiency was obtained when pumped by a Ti:Sapphire laser. All the laser operated in a single transverse mode, and the 1.535 micrometers laser operated at a single longitudinal mode. This study gives a useful guideline to design and to optimize the pump beam radius of LD end-pumped microchip lasers.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhiping Cai, Zhiping Cai, Alain M. Chardon, Alain M. Chardon, Francisco M. Sanchez, Francisco M. Sanchez, Guy Michel Stephan, Guy Michel Stephan, } "Investigation of absorption saturation in diode end-pumped microchip lasers", Proc. SPIE 2889, High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers, (30 September 1996); doi: 10.1117/12.253250; https://doi.org/10.1117/12.253250

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