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, Xiao-Kang Zhang, Run-Hua Li, 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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