Simulation and analysis of the time evolution of laser power and temperature in static pulsed XPALs

Abstract

A theoretical model is established to describe the thermal dynamics and laser kinetics in a static pulsed exciplex pumped Cs–Ar laser (XPAL). The temporal behaviors of both the laser output power and temperature rise in XPALs with a long-time pulse and multi-pulse operation modes are calculated and analyzed. In the case of long-time pulse pumping, the results show that the initial laser power increases with a rise in the initial operating temperature, but the laser power decreases quickly due to heat accumulation. In the case of multi-pulse operation, simulation results show that the optimal laser output power can be obtained by appropriately increasing the initial temperature and reducing the thermal relaxation time.

Effect of laser remelting on microstructure and properties of two Ni-base coatings by supersonic particles deposition

“…The specific process parameters for the preparation of coating were shown in table 3. The Ni-based alloy coating prepared by supersonic particle deposition was remelted by the ZKSX1000 continuous type laser cladding system, because the pulse laser may cause deep damage to the material surface [30][31][32][33]. Argon was used as protective…”

Modeling of three-dimensional exciplex pumped fluid Cs vapor laser with transverse and longitudinal gas flow

“…However, a sharp radial temperature gradient caused by severe thermal effects will occur in the gain medium during a continuous-wave (CW) operation XPAL, resulting in an uneven distribution of the number density of Cs particles, thereby reducing the output power of the laser [20] . To solve this issue, on the one hand, a multi-pulse pump can be used instead of a CW pump to alleviate the heat loading [21,22] ; on the other hand, studies show that longitudinal gas flow at the sonic level is required to control the thermal accumulation in a CW XPAL [23][24][25] , which is difficult to realize in experiment.…”