Time-varying Temperature Field Properties Of Laser Crystal Pumped By Pulsed Laser Diode

All solid-state lasers are well known as its superior performance. As the output power of laser increased, the thermal effects of laser crystal were induced. In order to reduce the thermal effect of laser crystal, the temperature field distribution of laser crystal during the LD pumping process must be obtained. The temperature distribution of laser crystal can provide a theoretical basis for reducing the thermal effects of laser crystal. In this paper, temperature field characteristics of Nd-ion laser crystal pumped by laser diode (LD) were studied. The contents mainly were summarized as:1. The development and advantages of all-solid-state lasers were overviewed. The temperature rise of laser crystal was analyzed. The methods which can eliminate and compensate the thermal effects of the laser crystal were expatiated.2. The thermal model of laser crystal end-pumped by fiber-coupled LD was established. The steady temperature field general analytical expression of laser crystal end-pumped by LD was obtained by the method of analytical analysis. Meanwhile, the thermal conductive isotropic Nd:YAG crystal were studied, and its temperature field, the thermal deformation and optical path difference distribution situation were obtained.3. Based on the thermal model of laser crystal end-pumped continuous fiber-coupled LD, a general analytical temperature field expression of laser crystal end-pumped by super-Gaussian pulse LD was deduced. The temperature field variation law of thermal conductive isotropic Nd:YAG crystal during pumping process of single pulse and repeat pulses were analyzed.4. A thermal model of slab side-pumped laser by LD bar bands was established and a general analytical temperature field expression of laser slab side-pumped by CW LD bar bands was deduced. Meanwhile the thermal conductive anisotropic Nd:GdV04 slab were studied, and its temperature field and thermal deformation distribution were obtained.5. Based on the thermal models of laser slab side-pumped by super-Gauss LD, a general analytical temperature field expression of laser slab side-pumped by pulse LD bar bands was deduced. Meanwhile, the temperature field characteristics of Nd:YVO4 and Nd:GdVO4 laser slab during pumping processes of single pulse and repeat pulses were compared and analyzed.