Abstract
Abstract A diode-pumped master oscillator power amplifier system based on a cryogenic Yb:YAG active-mirror laser has been developed. The performances of the laser amplifier at low temperature and room temperature have been investigated theoretically and experimentally. A maximum output energy of 3.05 J with an optical-to-optical efficiency of 14.7% has been achieved by using the master amplifier system.
Highlights
Solid-state lasers with high energy have been widely reported in many application fields, ranging from materials processing to remote sensing to laser-driven inertial fusion[1]
Prevention of damage to the optics can be achieved by scaling the laser gain medium and laser spot size
In order to apply a high energy pump source with a Ti:sapphire laser to obtain ultrashort pulses, a diodepumped master oscillator power amplifier system based on a cryogenic Yb:YAG/YAG active-mirror laser has been set up for the first step
Summary
Solid-state lasers with high energy have been widely reported in many application fields, ranging from materials processing to remote sensing to laser-driven inertial fusion[1]. For high energy laser oscillator and amplifier design, the amplified spontaneous emission (ASE), the thermal effects of the laser material, and the laser-induced damage threshold of the optics are the most important considerations. Yb:YAG, with a long fluorescence lifetime, broad emission band, low quantum defect, and excellent thermo-mechanical properties, has been considered to have great potential as a material to obtain high energy, high efficiency, and short duration pulse laser output using diode-pumped solid-state laser (DPSSL) systems[8, 9]. The laser operation threshold of Yb:YAG crystal is high for the reabsorption of a lower energy level. In order to apply a high energy pump source with a Ti:sapphire laser to obtain ultrashort pulses, a diodepumped master oscillator power amplifier system based on a cryogenic Yb:YAG/YAG active-mirror laser has been set up for the first step. 3.05 J at an optical-to-optical efficiency of 14.7% has been achieved at a cooling temperature of 155 K
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