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

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 a...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2020-12, Vol.50 (12), p.1140-1145
Main Authors: Andreeva, M.S., Artyushkin, N.V., Krymskii, M.I., Laptev, A.I., Polushin, N.I., Rogalin, V.E., Rogozhin, M.V.
Format: Article
Language:English
Subjects:
absorption coefficient
Absorptivity
Carbon dioxide
Carbon dioxide lasers
Diamonds
laser
Laser beams
Lasers
Magnetism
mathematical simulation
Optical materials
output window
polycrystalline CVD diamond
Polycrystalline diamond
Polycrystals
power density
pyrometer
radiation
Temperature dependence
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Summary: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.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL17423