30 November 2009 Determination of zero incident angle by optical feedback effect and its applications in the measurement of refractive indices
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Abstract
Prisms are involved in many instruments of measurements of refractive indices. The optical feedback effect in a semiconductor laser introduced by the reflection of a prism was applied to the determination of zero incident angle. Without any additional optical components or calibration setups the angular resolution reached 0.00074°. This approach was used in refractometers and prism coupling system. Prisms, water, wintergreen oil and a quartz plate were measured by total internal reflection technique and the optical feedback effect. In the measurement of prism, we proposed that the base angle of a detected prism should be appropriately prepared so as that the refractive index of an isosceles prism made of any material can be precisely measured. The results for a SrTiO3 prism with a base angle 30.0169 degree was 2.3780 at 659 nm. The measurements of water and wintergreen oil were performed by a reference prism made of SrTiO3. We found that the result for a quartz plate wouldn't be influenced by the index matching liquid between the plate and a reference prism, which was intentionally introduced, only if the index of the liquid was larger than that of the quartz. The refractive index of a polymer film was measured accurately and the maximum of deviation from mean was ±0.0001.
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Xiao-Kang Zhang, Run-Hua Li, "Determination of zero incident angle by optical feedback effect and its applications in the measurement of refractive indices", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 750620 (30 November 2009); doi: 10.1117/12.836599; https://doi.org/10.1117/12.836599
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