Fully immersed liquid cooling thin-disk oscillator

Abstract

A novel Nd:YAG thin-disk laser with excellent cooling configuration is demonstrated. A maximum output energy of 653 mJ is realized, corresponding to the optical–optical efficiency of 30% and the slope efficiency of 35%. The coefficient of output instability is as low as 1.1% at a repetition rate of 1 Hz. Beam propagation analysis reveals that beam distortion caused by temperature gradient will decrease effectively with this laser configuration.

Resonance spiking by periodic loss in the double-sided liquid cooling disk oscillator

“…The temperature gradient is parallel to the laser axis generally except there is a disturbance like turbulent flow. The laser output of our oscillator has a spot size of approximately 10 × 10 mm [22], it is not suitable for the wavefront analysis for its multimode and high energy. So we removed cavity mirrors and employed a signal laser (commercial SSL with a wavelength of 1064 nm and a diameter of 3 mm) for detection.…”

7kW direct-liquid-cooled side-pumped Nd:YAG multi-disk laser resonator

“…With the direct-liquid-cooled configuration, the linear arrangement of multiple thin disks is can be realized since the oscillating laser passes through dozens of thin disks transmissively [3,4], while a high pump intensity is allowed due to its efficient thermal management [5]. Furthermore, a flexible support is easy to realize and the awful wavefront aberration existing in the conventional thin disks that are welded on coolers can be avoided [6][7][8].…”