Robust wavelength-locked narrow-linewidth Er-doped yttrium aluminum garnet laser

摘要

We experimentally show and report on a high-slope-efficiency, wavelength-locked, narrow-linewidth operation in a resonantly diode-pumped Er-doped yttrium aluminum garnet (Er:Y_3Al_5O_(12), Er:YAG) laser by using a volume Bragg grating (VBG) as a wavelength selector and an input mirror simultaneously. In this wavelength-locked operation, a maximum output power of 6.5W at 1645 nm was achieved, which corresponds to a maximum slope efficiency of 105% with respect to the incident power. The small fluctuation of the lasing spectrum demonstrates good stability, with a 3 dB bandwidth of 0.06 nm at the center wavelength. This result shows potential applications of the VBG for high-efficiency, wavelength-locked, narrow-linewidth, and highly stable Er:YAG lasers.