Investigation946nm Directrectly Pumped Nd:YAG Laser

Currently,Nd:YAG laser has been widely used in military,biomedical,civil industrial areas,With the increasingly wide range of applications of the Nd:YAG laser output power, the laser output quality requirements also increasingly high, And in the process end-pumped Nd:YAG solid-state lasers, thermal effects is an important factor affecting the laser output, High thermal effects can severely reduce the laser output quality. The traditional808nm indirect-pumped Nd:YAG laser, due to the presence of the4Fs/2levelâ†'4F3/2level nonradiative transition process, Can be obtained by the computation, using946nm direct pumping mode and using the traditional808nm indirect pumping methods, fluorescence quantum efficiency is increased from75.9%to88.9%, increased by approximately13%. From this we can see that, Using946nm direct pumping method can effectively improve the fluorescence quantum efficiency, reduce the thermal effect, reduce the threshold power, conducive to the realization of high power, high quality laser output.But using946nm directly pumping the laser crystal to the pumping light absorption cross section is very small, only0.076cm-1, Therefore, in order to improve the slope efficiency, and reduce the pump threshold, and thus the article will specifically a Nd:YAG crystal physical properties, optical properties and aurora characteristics analyzed. Specific analysis of end-pumped Nd:YAG laser thermal effect of the causes and impact of the laser output. Simple calculations using808nm,885nm,946nm three pump wavelength quantum efficiency. Analysis of the crystal temperature activated ion doping concentration946nm directly pumped. Slope efficiency and threshold come946nm directly pumped through theoretical calculations and experimental verification.