| Besides characteristics of ordinary LD-pumped solid-state laser, LD-pumped Tm,Ho:YLF laser has high power output, compact structure, stable performance, long lifetime and all-solid-state. It's eye-safe and fit to crowd places. This kind of laser has relatively weak thermal effects and high energy storage, and it is an ideal pump source of 3～5μm optical parametric oscillator (OPO). In the system of military laser, atmosphere sensing and application of medicine, this kind of laser indicates promising foreground. This paper investigates and explores both theoretically and experimentally in the field of the diode-end-pumped continuous wave Tm,Ho:YLF laser.Theoretically, we have analyzed the level structure, mechanism, relative parameters of Tm,Ho:YLF, and the rate equations are given. In order to optimize the parameters, the laser threshold and the characteristics of the laser output are analyzed and simulated in mat-lab language based on the model of rate equations. On the basis of the heat conduction equation, we analyzed some heat-induced effects of the Tm,Ho:YLF solid-state laser, such as thermal power losses, thermal deformation, thermal focal length, thermal fracture to get a comprehensive understanding of the system.Experimentally, the diode-end-pumped plane-concave cavity Tm,Ho:YLF laser is studied at room temperature. The output powers as a function of incident pump power are given. Furthermore, the thermal focal lengths as a function of pump power are obtained by the method of small-hole scanning. At the same time, the thermal fracture threshold is measured by using the fiber-coupled laser diode to pump the Tm,Ho:YLF laser crystal. |
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