Modeling Of A Diode Transverse Pumped Cesium Vapor Laser

As a new class of laser device, diode pumped alkali vapor lasers (DPALs) have developed rapidly in recent years. DPALs have the advantages of both the solid lasers and the gas lasers which are promising in achieving near-infrared lasers with high power and high beam quality. Also DPALs have some desirable features such as the high quantum efficiency, the good optical quality of gain medium, the narrow line-width, operating wavelengths lying in an atmospheric transmission window and no hazardous expendable chemicals. So these lasers have potential applications in directional energy transmission, material processing and medical treatments. The diode transverse pumped alkali vapor laser was proposed for further improving the laser efficiency. Transverse pumped structure simplifies system design, separating the laser beam from the pump light and providing physical space for a large number of diode stacks needed for power scaling. So it is significant to do the research on the kinetic process of transverse pumped DPALs.On the basis of understanding and analyzing the mechanism and technical approach of transverse pumped DPALs, a physical model is established to demonstrate the laser mechanism and the kinetic process of a diode transverse pumped cesium vapor laser. Under the assumption that the pump light travels through the vapor cell only once, we get the distribution of pump laser power in vapor cell. The pump power is nonlinear attenuation along the transverse dimension. According to the experimental parameters, dependences of the output power and the one-way cavity transmission on the cell temperature are calculated, which agree well with the experimental results. Also the effects of parameters such as the pump power, the cell length and the output coupler reflectivity on the output performance of a diode transverse pumped Cs vapor laser are simulated and analyzed. The simulation results agree well with the experiment data which shows the validity of this model. A set of optimization parameters are achieved for improving the output characteristics of a diode transverse pumped Cs vapor laser.