THE IMPACT OF LASER ABLATION DURING THE CREATION OF ANTIREFLECTION MICROSTRUCTURES ON THE SURFACE COMPOSITION AND PROPERTIES OF OPTICAL ELEMENTS OF LiGaSe2 AND LiGaS2 CRYSTALS

10.25712/ASTU.1811-1416.2025.02.005

Authors

Keywords:

lithium selenogallate LiGaSe2, lithium thiogallate LiGaS2, nonlinear optical crystals, antireflection microstructures (ARM), femtosecond laser ablation, optical element surface, transmission spectra, absorption, Raman spectroscopy, crystal annealing

Abstract

The creation of antireflection microstructures (ARM) on the surface of optical elements made of chalcogenide crystals makes it possible to significantly increase their transmission. However, a surface with microstructures may be subject to processes that cause excessive absorption at certain wavelengths. This effect is typical for lithium selenogallate and thiogallate, promising nonlinear optical materials for mid-IR. For these materials, strong absorption appears in the spectra near 3 and 6 microns. This paper presents the results of a comprehensive study of changes in the surface of LiGaSe2 and LiGaS2 crystals after femtosecond laser ablation, and describes a technique for reducing excess absorption by annealing optical elements with microstructures in a special atmosphere.  It was found that LiGaSe2 has an excessive amount of selenium on the surface with ARM, while LiGaS2 is characterized by a predominance of gallium compounds. Unlike LiGaSe2 crystals, a dense "plaque" forms on the modified surface with microstructures of LiGaS2. It was experimentally shown that annealing of optical elements LiGaSe2, LiGaS2 with ARM makes it possible to eliminate absorption at wavelengths of 3 and 6 microns.

Author Biographies

Alina Goloshumova, Novosibirsk State University, 630090, Novosibirsk, Russia

PhD, Researcher at the Laboratory of Functional Materials of Faculty of Physics in Novosibirsk State University, Researcher at the Laboratory of Crystal Growth in Institute of Geology and Mineralogy SB RAS

Alexander Shklyaev, Novosibirsk State University, 630090, Novosibirsk, Russia

DSc, Leading Researcher at the Laboratory of Functional Diagnostics of Low-dimensional Structures for Nanoelectronics in Novosibirsk State University, Chief Researcher at the Laboratory of Nanodiagnostics and Nanolithography in the Institute of Semiconductor Physics SB RAS

Ludmila Isaenko, Novosibirsk State University, 630090, Novosibirsk, Russia

DSc, Senior Researcher at the Laboratory of Functional Materials of Faculty of Physics in Novosibirsk State University, Leading Researcher at the Laboratory of Crystal Growth in Institute of Geology and Mineralogy SB RAS

Sergei Lobanov, Novosibirsk State University, 630090, Novosibirsk, Russia

Junior Researcher at the Laboratory of Functional Materials of Faculty of Physics in Novosibirsk State University, Senior Researcher at the Laboratory of Crystal Growth in Institute of Geology and Mineralogy SB RAS

Aleksey Kurus, Novosibirsk State University, 630090, Novosibirsk, Russia

Junior Researcher at the Laboratory of Functional Diagnostics of Low-dimensional Structures for Nanoelectronics in Novosibirsk State University, Researcher at the Laboratory of Crystal Growth in Institute of Geology and Mineralogy SB RAS

Andrey Bushunov, Novosibirsk State University, 630090, Novosibirsk, Russia

Research Laboratory Assistant at the Laboratory of Functional Materials of Faculty of Physics in Novosibirsk State University, Junior Researcher at the Laboratory of Infrared Laser Systems of NOC Photonics and IR Technology in Moscow Bauman State Technical University

Andrey Teslenko, Novosibirsk State University, 630090, Novosibirsk, Russia

Laboratory Assistant at the Laboratory of Functional Materials of Faculty of Physics in Novosibirsk State University, Engineer at the Laboratory of Infrared Laser Systems of NOC Photonics and IR Technology in Moscow Bauman State Technical University

Mikhail Tarabrin, Novosibirsk State University, 630090, Novosibirsk, Russia

PhD, Engineer at the Laboratory of Functional Materials of Faculty of Physics in Novosibirsk State University, Senior Researcher at the Laboratory of Infrared Laser Systems of NOC Photonics and IR Technology in Moscow Bauman State Technical University

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Published

2025-06-30

How to Cite

Goloshumova А., Shklyaev А., Isaenko Л., Lobanov С., Kurus А. ., Bushunov А., Teslenko А., & Tarabrin М. (2025). THE IMPACT OF LASER ABLATION DURING THE CREATION OF ANTIREFLECTION MICROSTRUCTURES ON THE SURFACE COMPOSITION AND PROPERTIES OF OPTICAL ELEMENTS OF LiGaSe2 AND LiGaS2 CRYSTALS: 10.25712/ASTU.1811-1416.2025.02.005. Fundamental’nye Problemy Sovremennogo Materialovedenia / Basic Problems of Material Science, 22(2), 174–183. Retrieved from https://ojs.altstu.ru/index.php/fpsm/article/view/1077

Issue

Vol. 22 No. 2 (2025): Basic Problems of Material Science

Section

SECTION 1. CONDENSED MATTER PHYSICS