Near-diffraction-limited passively Q-switched Yb:Y_3Al_5O_(12) ceramic lasers with peak power >150 kW

摘要

Laser-diode pumped nearly diffraction-limited beam quality (M~2 < 1.05), high peak power, subnanosecond passively Q-switched Yb:Y_3Al_5O_(12) ceramic miniature laser with Cr~(4+):Y_3Al_5O_(12) ceramic as saturable absorber has been achieved. The slope efficiency is as high as 36% for 80% initial transmission of Cr~(4+): Y_3Al_5O_(12) ceramic. The pulse width of 335 ps and peak power of over 150 kW at repetition rate of 5 kHz were obtained. Laser oscillates at single-longitudinal-mode oscillation and wide-separated multilongitudinal-mode oscillation due to the combined etalon effect of the Cr~(4+): YAG thin plate and thin glass plate as output coupler.