High efficiency single-longitudinal-mode resonantly-pumped Ho:GdTaO4 laser at 2068nm.

ABSTRACT

Based on Faraday effect we demonstrate a thulium fiber pumped continuous-wave single-longitudinal-mode laser with a new HoGdTaO4 crystal. By inserting a faraday rotator and a half-wave plate into the laser cavity, the single-longitudinal-mode output power of 392 mW at wavelength of 2068.33 nm was obtained in unidirectional HoGdTaO4 ring laser, corresponding to a slope efficiency of 60.2% respect to the absorbed pump power. Furthermore, utilizing the HoGdTaO4 power amplifier, the maximum single-longitudinal- mode output power of 1.02 W was achieved.