Multipass optical reactor for efficient laser transformation of dispersed materials

Summary form only given. Multipass optical reactor for the creation of metastable phases of ultra-dispersed, diamond-similar, many-component semiconductor and ceramic powders is suggested. For Instance, these powders can be used as a anti-friction and anti-wear additions to the metal-diamond composite covers and so on. Initial powders (0, EN, SiO2) are injected into reactor, which is carried out as an optical cavity with the central hole for introducing the laser radiation. As a result of the diffraction by aperture the radiation occupy the volume with the essential large diameter. Laser Intensity is not strongly reduced due to multiple passes. In the irradiated zone the high-speed heating of dispersed component by laser pulse and rapidly cooling in the dense gas atmosphere takes place. These processes result in the necessary phase transformations. Numerical simulations of electromagnetic field space distribution in the multipass reactor and laser heating dynafnics of dispersed particle in the dense surrounding gas are carried out. According to the calculations, the portion of the laser energy going for particle heating can reach /spl tilde/ 35 %.