Antireflection Coating On Organic Nonlinear Optical Crystals Using Soft Materials
APPLIED PHYSICS LETTERS(2019)
摘要
We have realized practical antireflection (AR) coatings for organic nonlinear optical crystals via dip coating of soft materials; specifically, the amorphous fluoropolymer Cytop. 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST) crystals were coated with a Cytop solution; the coating thickness was controlled by the Cytop solution concentration. The Cytop coating did not show evidence of cracking or peeling after 200 days. The transmittance of AR-coated DAST crystals using a 5% Cytop solution was 90.9% at 1560 nm, an improvement of 17.8% compared to that before coating. High repeatability of the improvement was also confirmed. Moreover, the AR-coated DAST crystal was confirmed to have a stable transmittance over 720 minutes against the irradiation of a femtosecond laser with a power density of 3.6 GW/cm(2). The ability to coat organic nonlinear optical crystals with an AR layer using soft materials is expected to have a wide range of optical applications. Published under license by AIP Publishing.
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