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A laser-diode end-pumped Nd:YVO 4 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 the symmetrical LG01-HG01-TEM00 mode transition happens when laser crystal is moved laterally inside several-tens-micron area. The possible mechanism responsible for the phenomenon of symmetrical mode transition is also discussed. © 2013 Chinese Optics Letters.

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