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首页> 外文会议>Thin-Film Coatings for Optical Applications IV; Proceedings of SPIE-The International Society for Optical Engineering; vol.6674 >Vapor-phase-deposited organosilane coatings as 'hardening' agents for high-peak-power laser optics
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Vapor-phase-deposited organosilane coatings as 'hardening' agents for high-peak-power laser optics

机译：气相沉积的有机硅烷涂层作为高峰值功率激光光学器件的“硬化”剂

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摘要

Multilayer-dielectric (MLD) diffraction gratings are used in high-power laser systems to compress laser-energy pulses. The peak power deliverable on target for these short-pulse petawatt class systems is limited by the laser-damage resistance of the optical components in the system, especially the MLD gratings. Recent experiments in our laboratory have shown that vapor treatment of MLD gratings at room temperature with organosilanes such as hexamethyldisilazane (HMDS) produces an increase in their damage threshold at 1054 nm (10-ps, 370-μm spot size) as compared to uncoated MLD grating control samples. The 1-on-1 laser-damage threshold of an HMDS-treated grating increased by 4.5% as compared to the uncoated control sample, while the N-on-1 damage threshold of an MLD grating treated with tetramethyldisilazane increased by 16.5%. For an MLD grating treated with bis-(trifluoropropyl)tetramethyldisilazane, the N-on-1 and 1-on-1 damage thresholds increased by 4.8% and 5.3%, respectively. Such increases in laser-damage threshold are unprecedented and counterintuitive because it is widely believed that the presence of organic materials or coatings on the surfaces of optical substrates will inevitably lead to reduced laser-damage resistance.
机译：多层电介质（MLD）衍射光栅用于高功率激光系统中，以压缩激光能量脉冲。这些短脉冲千兆瓦级系统在目标上可传递的峰值功率受到系统中光学组件（尤其是MLD光栅）的激光损伤电阻的限制。我们实验室中的最新实验表明，与未涂覆的MLD相比，室温下用六甲基二硅氮烷（HMDS）等有机硅烷对MLD光栅进行蒸汽处理会增加其在1054 nm（10-ps，370μm光斑尺寸）的损伤阈值光栅对照样品。与未涂覆的对照样品相比，经HMDS处理的光栅的1对1激光损伤阈值增加了4.5％，而经四甲基二硅氮烷处理的MLD光栅的1对1激光损伤阈值增加了16.5％。对于用双（三氟丙基）四甲基二硅氮烷处理的MLD光栅，N对1和1对1的损伤阈值分别增加了4.8％和5.3％。激光损伤阈值的这种增加是空前的并且是违反直觉的，因为人们普遍认为，光学基板表面上有机材料或涂层的存在将不可避免地导致降低的激光损伤抵抗力。

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