Fabrication of UV-curable silicone coating with high transmittance and laser-induced damage threshold for high-power laser system
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Third harmonic generating (THG) element is an important component for high-power laser system and its incident side is in need of high transmittance and laser-induced damage threshold (LIDT) at specified wavelengths (1064 nm and 532 nm) to meet the demand of laser-driven inertial confinement fusion. An UV-curable organic–inorganic hybrid silicone coating was fabricated for this THG element and its relevant properties have been investigated. Si–O–Si backbone structure in combination with characteristics from a mixture of tripropyleneglycoldiacrylate (TPGDA) as a reactive diluent and Darocur 1173 (HMPP) as a photoinitiator provided qualified adhesion, hardness, transmittance, and laser damage resistance for the UV-cured coating. Based on this design, THG element with both high transmittance and LIDT at specified wavelengths was successfully achieved after the solidification of coatings by means of UV irradiation, which provides an alternate option to cure coatings upon the temperature-sensitive substrates (like potassium dideuterium phosphate (DKDP), ammonium dihydrogen phosphate (ADP), and so on) without heating, and meanwhile greatly reduces the time consumption of curing process.
Photopolymerization of silicone coating is applied in high-power laser system.
Qualified optical, mechanical, and laser-resistant property is achieved.
The phase transition problem of precious DKDP crystal is solved.
KeywordsUV-curable Silicone coating Transmittance Laser-induced damage threshold High-power laser system
This work is supported by the National Natural Science Foundation of China (grant no. 51505575).
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Conflict of interest
The authors declare that they have no conflict of interest.