We report an all-solid-state laser system that generates over 200 mW cw at 244 nm. An optically pumped semiconductor laser is internally frequency doubled to 488 nm. The 488 nm output is coupled to an external resonator, where it is converted to 244 nm using a CsLiB(6)O(10) (CLBO) crystal. The output power is limited by the available power at 488 nm, and no noticeable degradation in output power was observed over a period of several hours.
We investigate the effect of water impurity in a CsLiB(6)O(10) (CLBO) crystal on the ultraviolet properties of the bulk laser-induced damage threshold (LIDT) and transmittance. The water impurity was eliminated by heating the CLBO sample with dimensions of 5 mm x 5 mm x 10 mm at 150 degrees C in an ambient atmosphere and subsequently in a dry atmosphere. The bulk LIDT of the sample after heat treatment improved by about 1.6-fold compared with that before heat treatment.
H2PtCl6 was intercalated into natural graphite by applying ultrasound to a mixture of
graphite, H2PtCl6, CCl4, and SOCl2 for 3 days. X-ray diffraction data showed that the host
lattice was partly intercalated by H2PtCl6. A mixture consisting of a third and fourth stage
together with unreacted graphite was observed. The intercalation compound was suspended
in acetone with hydrogen flowing through while the sonication took place for 2 days.
Transmission electron microphotographs showed highly dispersed nanoparticles in a narrow
size range inside the carbon lattice. X-ray photoelectron spectroscopy gave evidence that
these particles are platinum metal (Pt0). Particle thickness estimated by X-ray diffraction
indicated an average particle thickness of two layers. Selected-area electron diffraction
microphotographs showed a pattern that could be hexagonally indexed. A (2 × a
graphite)
superstructure was observed for those quasi-two-dimensional aggregates formed by self-organization. This indicates a templating effect due to the carbon lattice.
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