Analysis And Calculation Of DPAL Rate Equation Considering The Spatial Distribution Of The Pump

With lasers in aerospace,defense technology and other industrial demand for efficient high-power laser,resulting in a high power output performance has become an important area of research.Alkali metal semiconductor laser gain medium because it uses steam alkali metal vapor state laser gain medium has many advantages,such as high quantum efficiency,easy flow,good heat dissipation.Therefore,a semiconductor laser having a high alkali metal power efficient laser output potential.And the laser output wavelength is 0.7-1.1?m,located just inside the range of the atmospheric window,it can form an effective interference and influence on the optoelectronic coupling device,according to this feature it in the military field.Currently,the maximum output of 1kW international cesium vapor laser has been able to achieve this type of laser corresponding scientific experimental and theoretical research in the country has started to become a hot spot.In these theoretical studies,a semiconductor pump light distribution in the media,as well as light and oscillation pattern matching situation will have a significant impact on the type of laser pump threshold,slope efficiency,output power,thus becoming theoretical study a main focus.However,the current situation of literature,in the study of alkali metal laser pump light distribution pattern matching available literature is also less,so this kind of laser media for internal pump light intensity distribution created a 3D model to analyze Some parameters of the pump light of factors such as focus position,beam waist radius of influence DPAL light process.Firstly,according to the theory of three-level laser system to obtain three-dimensional rate equations,then by Euler's method to solve equations,combined with boundary conditions of the laser system running the model iterative solver.By changing the laser beam radius to simulate the pattern matching factor on the system The optimization of the laser output provides a reference.When pattern matching the best calculation of the impact on the medium length of the laser output and threshold values.In the fixed pump input,we simulate the pump light is focused in different media positions output changes when the laser to obtain the optimum focus position.Finally,we calculate the reflectivity at different coupling relationship between the laser and the pump light.