M. S. Andreeva, N. V. Artyushkin, M. I. Krymskii, A. I. Laptev, N. I. Polushin, V. E. Rogalin, M. V. Rogozhin, “Effect of CO<sub>2</sub>-laser power density on the absorption coefficient of polycrystalline CVD diamonds”, Kvantovaya Elektronika, 2020, Volume 50, Number 12,Pages <nobr>1140

This article is cited in 4 papers

Interaction of laser radiation with matter

Effect of CO₂-laser power density on the absorption coefficient of polycrystalline CVD diamonds

M. S. Andreeva^a, N. V. Artyushkin^b, M. I. Krymskii^b, A. I. Laptev^b, N. I. Polushin^b, V. E. Rogalin^c, M. V. Rogozhin^b

^a Lomonosov Moscow State University
^b National University of Science and Technology «MISIS», Moscow
^c Institute of Problems of Electrophysics of the Russian Academy of Sciences, St. Petersburg

Abstract: The effect of 1-s irradiation of an uncooled polycrystalline CVD diamond plate by a focused cw CO₂ laser beam with a power density of 300 – 800 kW cm^-2 is investigated. The absorption coefficient of the sample at a power density of 800 kW cm^-2 is found to be 0.035 cm^-1 larger as compared with that at 300 kW cm^-2, which is related to the temperature dependence of its phonon-induced absorption with a change in temperature from 44 to 100 °C. It is shown that polycrystalline diamond, in contrast to other optical materials, does not exhibit nonlinear (avalanche-like) rise in absorption at high CO₂-laser power densities, at least up to 800 kW cm^-2.

Keywords: polycrystalline CVD diamond, CO₂ laser, radiation, power density, absorption coefficient, output window, pyrometer, mathematical simulation.

Received: 18.08.2020
Revised: 05.10.2020