We have fabricated a second-harmonic-generation device with a new walk-off-compensating structure of -BaB 2 O 4 (BBO) by room-temperature bonding. The 5-mm-long device, which consists of four 1-mm-thick plates and additional input and output plates of 0.5 mm thickness, generated nearly twice the UV second-harmonic power compared with a bulk BBO crystal. Moreover, we found that the device can improve the beam shape of the output UV light, which is otherwise degraded in a bulk crystal due to the walk-off effect. #
This paper describes the first demonstration of ultraviolet (266nm) vortex generation using the combination of a frequency-doubled nanosecond green laser, a spiral phase plate, and a periodically bonded β-BaB2O4 device. For a laser pumping energy of 9.1 mJ, an ultraviolet vortex energy of 1.24 mJ was obtained, corresponding to a conversion efficiency of 13.7%.
A new type microwave dummy-load using Silicon Carbide (SiC) ceramic, which has an indirect water cooling structure, was successfully operated with up to 50-MW of rf power at a 1-µs pulse width and 50-pps repetition rate in the S-band frequency. The input VSWR obtained was less than 1:1
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