METHOD FOR DESIGNING LASER-PUMPED SOLID LASER

摘要

PROBLEM TO BE SOLVED: To satisfy at concurrently both a low oscillating threshold value and a high mode matching efficiency by using a quasi-three level or three level laser medium with the laser lower level belonging to a base level group and to design in such a manner that the minimum spot radius of laser-pumping light satisfies specific equations. ;SOLUTION: A quasi-3 level or 3 level laser medium with the laser lower level belonging to a base level group is used, and design is performed in such a manner that the minimum spot radius wp₀ of the laser-pumping light satisfies the equations. In the equations, M² is M² factor of pumping light source, λp is the wavelength of pumping light source, L is a laser medium length, (n) is the refractive index of laser medium, η_a is the absorption efficiency of pumping light, Pi is incident pumping power, (x) is an arbitrary number larger than 1, I_th is a laser-oscillating threshold pumping light intensity. By adjusting at least any one of the light-collecting beam shape, laser medium shape, resonator shape and output mirror transmittance in a manner which satisfies the formula, a laser of the optimum output can be designed easily.;COPYRIGHT: (C)1999,JPO