Experimental Investigation of Laser Damage Limit for ZPG Infrared Single Crystal Using Deep Magnetorheological Polishing of Working Surfaces

Experimental Investigation of Laser Damage Limit for ZPG Infrared Single Crystal Using Deep Magnetorheological Polishing of Working Surfaces

Zinc germanium phosphide (ZGP) crystals have garnered significant attention for their nonlinear properties, making them good candidates for powerful mid-IR optical parametric oscillators and second-harmonic generators. A ZnGeP<sub>2</sub> single crystal was treated by deep magnetorheolog...

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Bibliographic Details
Main Authors: Nikolay N. Yudin, Andrei Khudoley, Mikhail Zinovev, Elena Slyunko, Sergey Podzyvalov, Vladimir Kuznetsov, Gennady Gorodkin, Pavel Kumeysha, Alexey Lysenko, Andrey Kalsin, Akmal Gabdrakhmanov, Oleg A. Romanovskii, Sergey Kashevsky, Houssain Baalbaki
Format: Article
Language:English
Published: MDPI AG 2023-12-01
Series:Crystals
Subjects:
ZGP
magnetorheological polishing
laser-induced damage
Online Access:https://www.mdpi.com/2073-4352/14/1/32
Description
Summary:Zinc germanium phosphide (ZGP) crystals have garnered significant attention for their nonlinear properties, making them good candidates for powerful mid-IR optical parametric oscillators and second-harmonic generators. A ZnGeP<sub>2</sub> single crystal was treated by deep magnetorheological processing (MRP) until an Angstrom level of roughness. The studies presented in this article are devoted to the experimental evaluation of the influence of deep removal (up to 150 μm) from the surface of a ZnGeP<sub>2</sub> single crystal by magnetorheological polishing on the parameters of optical breakdown. It was shown that the dependence of the ZnGeP<sub>2</sub> laser-induced damage threshold on MRP depth is a smooth monotonically decreasing logarithmic function. The obtained logarithmic dependence indicates the thermal nature of optical breakdown and the dependence of the ZnGeP<sub>2</sub> laser-induced damage threshold on the concentration of surface absorbing defects.
ISSN:2073-4352

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