High efficiency slab Tm:YAP laser dual-end-pumped by fiber coupled laser diodes

A Tm:YAP slab laser with double-end-pumped and high efficiency under room temperature is introduced. Considering the cooling of the end faces and lateral faces of the crystal, analyses of the thermal effects in which all six faces cooled by the convection cooling mechanism was assumed to solve the equations of heat conduction. By using the double-concave geometry to offset thermal lens effect, the maximum output power was 25.02W at the incident pump power of 75.97W, corresponding to the optical-to-optical efficiency of 37.05% and slope efficiency of 35.85%. F-P etalon is inserted in the cavity to control laser FWHM line width of 0.44nm at 1938.7nm. And the optical beam quality is measured when pumped power is 20W,which is the beam quality factor of M-2 was estimated of 3.25 in x-direction and 2.79 in y-direction.