A passively Q-switched Nd:YAG/Cr(4+):YAG micro-laser with three-beam output was realized. A single active laser source made of a composite, all-ceramics Nd:YAG/Cr(4+):YAG monolithic cavity was pumped by three independent lines. At 5 Hz repetition rate, each line delivered laser pulses with ~2.4 mJ energy and 2.8-MW peak power. The M(2) factor of a laser beam was 3.7, and stable air breakdowns were realized. The increase of pump repetition rate up to 100 Hz improved the laser pulse energy by 6% and required ~6% increase of the pump pulse energy. Pulse timing of the laser-array beams can by adjusted by less than 5% tuning of an individual line pump energy, and therefore simultaneous multi-point ignition is possible. This kind of laser can be used for multi-point ignition of an automobile engine.
A solid-state laser material of composite all-ceramic Yb:Y3Al5O12 is applied as a source of a high-power, diode edge-pumped microchip laser. 520W quasi-continuous-wave and 414W continuous-wave (cw) output powers were obtained from the 3.7-mm-diameter, Yb doped ceramic core with a 200μm thickness. The cw output power densities of 3.9kW∕cm2 and 0.19MW∕cm3 in the core area and volume, respectively, are the highest for an active-mirror solid-state laser. The maximum thermal stress in the ceramic core is estimated to be 384MPa at the noncooled surface and is twice the tensile strength of single-crystal Y3Al5O12.
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