Effect of antireflection microstructures on the optical properties of GaSe

The main application area for GaSe crystals is nonlinear optics, but there are problems with machining and antireflection coatings due to the layered structure of GaSe. Large GaSe crystals with dominant ε-modification were grown. Using various harmonics of a femtosecond laser, antireflection microst...

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Bibliographic Details
Published in:Optical materials express 2022-04, Vol.12 (4), p.1593
Main Authors: Yelisseyev, Alexander P., Isaenko, Lyudmila I., Lobanov, Sergey I., Dostovalov, Alexander V., Bushunov, Andrey A., Tarabrin, Mikhail K., Teslenko, Andrei A., Lazarev, Vladimir A., Shklyaev, Alexander A., Babin, Sergey A., Goloshumova, Alina A., A.Gromilov, Sergey
Format: Article
Language:English
Subjects:
Antireflection coatings
Crystal defects
Crystal structure
Laser ablation
Machining
Microscopes
Microstructure
Nonlinear optics
Optical microscopy
Optical properties
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Summary:The main application area for GaSe crystals is nonlinear optics, but there are problems with machining and antireflection coatings due to the layered structure of GaSe. Large GaSe crystals with dominant ε-modification were grown. Using various harmonics of a femtosecond laser, antireflection microstructures (ARM) were fabricated by laser ablation on the plate surface and modes providing increased transmission up to 90% in the mid-IR were selected. Using SEM and optical microscopy, as well as EDX and optical spectroscopy, defects on the GaSe surface and their effect on the spectral region and the degree of transmission increase were studied.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.455050