500 Hz single-frequency, pulsed Er:YAG laser in the double corner cube retroreflector resonator

Abstract

We have demonstrated an injection-seeded, single-frequency Q-switched Er:YAG laser at the pulse repetition frequency (PRF) of 500 Hz with the ‘double piezoelectric transducers (PZTs) structure’, in a double corner cube retroreflector (DCCR) resonator. With the ‘ramp-hold-fire’ method, the maximum 1.34 mJ pulse energy with a pulse width of 482 ns has been achieved. With the heterodyne beating technique, the full width at the half maximum (FWHM) of the laser spectrum is 1.12 MHz. And the M2 factors of the 500 Hz, single-frequency pulsed laser are 1.2, 1.24 along the horizontal and vertical directions.