M. V. Rogozhin, V. E. Rogalin, M. I. Krymskii, I. A. Kaplunov

ON THE POSSIBILITY OF INCREASING THE SERVICE LIFE OF HIGH-POWER LASER OPTICS THROUGH THE USE OF POLYCRYSTALLINE DIAMOND WINDOWS WITH A CENTRAL MONOCRYSTALLINE AREA

For high-power CO₂ lasers operating at 10-µm wavelength there is a serious deficiency of transparent materials. Only expensive semiconductor and dielectric materials with poor mechanical and thermal characteristics are transparent in this spectral region. The construction of an output high-power laser window made of polycrystalline diamond with a single-crystalline central region is considered. Numerical modeling of an optical damage threshold is performed. The results are compared with those for a conventionally designed polycrystalline diamond window. An increase in maximum allowed output radiation power due to the use of a composite window is demonstrated.

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