High-Power and High-repetition-rate widely tunable Narrow-Linewidth low-gain-band Ti: Sapphire laser

A high-power and high-repetition-rate widely tunable narrow-linewidth low-gain-band Ti: sapphire laser dual -end pumped by a 10 kHz 532 nm pulsed laser with an output wavelength of 690-760 nm was demonstrated. A seed-self-injection coupled cavity based on a Littman grating and dispersive prism was employed to narrow the output linewidth. When the pump power was 40.1 W, a maximum output power of 1.89 W at 730 nm was obtained with a linewidth of 1.5 pm and a pulse duration of 38.7 ns. The corresponding conversion efficiency was 4.71 %, and the beam quality in the x and y directions was 1.94 and 1.91, respectively. By successively rotating the front cavity mirror and broadband total reflector, a stable near-single-longitudinal-mode output of 690-760 nm could be achieved, with a maximum power of 2.35 W at 760 nm.