Linear polarization output performance of Nd:YAG laser at 946 nm considering the energy-transfer upconversion

Abstract

A theoretical model of quasi-three-level laser system is developed, in which both the thermally induced depolarization loss and the effect of energy-transfer upconversion are taken into account. Based on the theoretical investigation of the influences of output transmission and incident pump power on thermally induced depolarization loss, the output performance of 946 nm linearly polarized Nd:YAG laser is experimentally studied. By optimizing the transmission of output coupler, a 946 nm linearly polarized continuous-wave single-transverse-mode laser with an output power of 4.2 W and an opticaloptical conversion efficiency of 16.8% is obtained, and the measured beam quality factors are M 2 x = 1.13 and M 2 y = 1.21. The theoretical prediction is in good agreement with the experimental result.

Stable continuous-wave single-frequency intracavity frequency-doubled laser with intensity noise suppressed in audio frequency region*

“…Continuous-wave (cw) single-frequency all-solid-state lasers with the features of low noise, good beam quality, and long coherent length have found applications in a number of fields, including quantum information, cold atom physics, and precise measurements. [1][2][3][4][5][6][7][8][9] In particular, a single-frequency laser source with high power dual-wavelength output is more beneficial to those investigations and measurements. For example, in the generations of squeezed states and entanglements at 1.06 µm, the pump filed, the local oscillator, the signal field for the optical parametric amplifier (OPA) or optical parametric oscillator (OPO), and the auxiliary beams used for cavity locking and phase locking can be provided simultaneously by a multi-Watts level single-frequency 1.06 µm and 532 nm dual-wavelength laser.…”