Abstract
Diode-pumped alkali vapor laser (DPAL) is a new class of laser, and it is expected to realize high efficiency and high-average-power laser with good beam quality (near-diffraction-limited). DPAL offers CW laser radiation at near-infrared wavelengths and can find a lot of applications in power beaming, drilling oil and gas well and laser material processing. Operating temperature affects not only the density of alkali vapor atom in active region, but collision broadening and fine-structure mixing rate. In this paper, we study the operating temperature characteristics of DPAL. Based on the theory of quasi-three level CW laser, the dependence of cesium laser output power on the operating temperature has been simulated. The results showed that there exists an optimal operating temperature around 95 to 110 centigrade for high pumping power. In lower temperature region, the laser power rise linearly with increasing operating temperature, namely increasing active density. However, the laser power falls after the optimal operating temperature, because the spontaneous radiations deplete large numbers of stimulated population contributing to laser emissions. At the optimal temperature, an optical- optical efficiency of about 73% is able to reach theoretically.
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