Theoretical simulations on pulsed exciplex pumped Rb vapor laser

Abstract

A theoretical model is established to describe the laser kinetics and output performance for the pulsed exciplex pumped Rb-Kr laser by combining the rate equations, power propagation equations and thermal conduction equations. Influences of the initial temperature, pump pulse duration and ethane concentration on the output feature and temperature rise are calculated and analyzed. In the long-pulse four-level Rb-Kr XPAL, simulation results show that the optical-to-optical efficiency increases with the rise of initial temperature, but it drops faster due to more heat deposition. In the multi-pulse mode, the quasi-continuous-wave Rb-Kr XPAL with a duty cycle on the order of 10% can be achieved by turning on the pump light when the temperature rise drops to 1/2 of its maximum and switching off when the laser signal decays to 1/e of its maximum. Five-level Rb-Kr modeling shows that the laser output at 780 nm and 795 nm can be observed simultaneously when the pressure of ethane is between 2 torr and 18 torr.