Total energy and energy distribution in a laser crystal due to optical pumping, as calculated by the Monte Carlo method

Abstract

The Monte Carlo technique is applied to discover the total absorbed energy and its distribution within a laser crystal in complex pumping systems not amenable to normal analysis. Allowance is made for: the effects of multiple reflections, both specular and diffuse; modification of Lambert-law emission by refraction at flashlamp envelopes; the effect of laser crystal absorptivity on total absorbed energy; and the use of phosphors for increasing the efficiency of utilization of pump radiation by effectively broadening the crystal absorption bands. The results are in good agreement with previous experimental work and with less comprehensive theoretical treatments of simple systems. The effects of multiple reflections, both specular and diffuse, and of uneven energy distribution on overall laser efficiency are demonstrated quantitatively.