Theoretical simulation on exciplex pumped Rb vapor laser

Area of Science:

• Laser Physics
• Physical Chemistry
• Thermodynamics

Background:

• Exciplex-pumped alkali vapor lasers offer unique spectral properties.
• Understanding kinetic and thermodynamic processes is crucial for optimizing laser performance.
• Existing models may not fully capture complex thermal effects.

Purpose of the Study:

• To develop a physical model for exciplex-pumped Rb vapor lasers.
• To analyze the influence of various parameters on laser performance.
• To investigate the impact of heat accumulation on temperature distribution and efficiency.

Main Methods:

• Establishment of a physical model considering spectrally resolved absorption and temperature distribution.
• Calculation and analysis of laser kinetic and thermodynamic processes.
• Comparison with existing models (e.g., Carroll's model).
• Simulation of parameter influences (pump intensity, temperature, reflectivity, Kr density).
• Calculation of temperature distribution with heat accumulation.

Main Results:

• A comprehensive physical model for Rb-Kr exciplex-pumped-atom-vapor laser (XPAL) was developed.
• Influences of pump intensity, temperature, output coupler reflectivity, and Kr density were analyzed for uniform temperature distribution.
• Maximal optical-to-optical efficiency of approximately 5.7% was achieved under specific conditions (I0 = 5.2 × 10^10 W/m^2, u = 250 m/s) when considering heat accumulation.

Conclusions:

• The developed model accurately describes the laser kinetic and thermodynamic processes.
• Parameter optimization is key to maximizing the efficiency of CW Rb-Kr XPAL.
• Heat accumulation significantly impacts temperature distribution and achievable efficiency.