Low pressure solid-state source

Related to the CVD process is the low-pressure solid-state source (LPSSS) process, where preformed mixtures of carbon and diamond seeds [7] or carbon and metal [8] are treated in a H2 plasma, thus forming compact diamond ceramics. 

Solid State Lasers. The first successful laser, and one that is still used, is a three-level device in which a ruby crystal is the active medium. Ruby is primarily AhO, but contains approximately 0.05% chroraium(III) distributed among the aluminum(III) lattice sites, which accounts for the red coloration. The chromium(III) ions are the active lasing material. In early lasers, the ruby was machined into a rod about 4 cm long and 0.5 cm in diameter. A flash tube (often a low-pressure xenon lamp) was coiled around the cylinder to produce intense flashes of light (A = 694.3 nm). Beeause the flashlamp was pulsed, a pulsed beam was produced. Continuous-wave (CW) ruby sources are now available. 

There is now a growing body of evidence that Cgg, under conditions of nonhydrostatic pressure, can be converted to diamond. The use of Cgg as a carbon source in solid state conversions to diamond by low-pressure, low-temperature routes is also a possibility that is being explored. 

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