Polarization-dependent intensity noise in a microchip solid-state laser with spatially coherent polarization vector fields

Abstract

Polarization-resolved intensity noise has been investigated experimentally in a laser-diode-pumped isotropic microchip solid-state laser possessing spatially coherent polarization vector fields, which are formed by the coherent superposition of a pair of orthogonally polarized Ince-Gauss (IG) modes through the transverse mode locking. A large amount of noise reduction as compared with the total output, which is a coherent state, was observed for the stronger IG mode component by controlling the pump-beam focus.

Linearly polarized pumped passively Q-switched Nd:YVO4microchip laser for Ince–Gaussian laser modes with controllable orientations

“…Now apart from the method of controlling the pump power incident on the gain medium, there is no other convenient and universal way to change IG mode numbers in lasers. On the other hand, most of the efforts have recently been paid to control the IG mode numbers in solid-state lasers [2,3,[7][8][9][10][11][12][13][14]. However, the orientation of the IG mode was not taken into account in the solid-state lasers for IG modes.…”