A laser plasmotron for chamberless deposition of diamond films

The laser-plasma method is developed for diamond synthesis in air without using vacuum or reaction chambers. The design of a laser plasmotron based on a 3-kW cw CO₂ laser for synthesis of diamond films on substrates of size 3—4 times larger than the transverse size of the plasma jet is presented. Various regimes of plasmotron operation while moving the substrate relative to the laser plasma are considered. Possible directions in further investigations in the field of laser plasma synthesis of diamond on large areas are discussed.