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KMID : 1159320090110040269
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Korean Journal of Vision Science
2009 Volume.11 No. 4 p.269 ~ p.275
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Measurements of refractive index and film thickness of hard-coated Lenses using Prism-Film Coupler method
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Woo Hyun-Kyung
Baarg Sang-Bai
Jeong Youn-Hong
Kim Hong-Seon
Lee Seong-Jae
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Abstract
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Purpose : In a hard-coated lens which front surface is plane(γ= ∞) we measured the thickness and the refractive index of coated film without damaging the film.
Methods : He-Ne laser light, which was collimated using lenses, was applied to the film through Gadolinium Gallium Garnet(G.G.G.) prism. Some modes of the incident light were observed with m-th lines. The distance between these lines was measured by prism-film coupler method using a photo-detector.
Result : The film thickness is ~2.42 ㎛, the refractive index is ~1.60 in TE mode and the film thickness is ~2.55 ㎛, the refractive index is ~1.60 in TM mode. The average thickness of the film measured using two polarized modes(TE & TM modes) is ~2.49 ㎛.
Conclusions : The value(~2.49 ㎛) shows 5.5% difference compared to the thickness measured using an electron microscope.
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KEYWORD
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Film thickness, Hard-coated lens, Prism-film coupler method, Refractive index
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