Transverse mode transition and LG01 mode generation in an end pumped Nd:YVO4 las

A laser-diode end-pumped Nd:YVO4 crystal laser is demonstrated to emit the first-order Laguerre-Gaussian (LG01) mode with 502-mW laser power and 22% slope efficiency. The LG01-mode is lased only when the pumping area locates in the central part of the laser crystal's front surface, and thereafter th