Chunyu Yuan, Yang Cao, Yong Deng, Shulian Zhang. Improving the measurement accuracy of refractive index of GaAs and Sapphire Crystal by laser feedback interferometry[J]. Infrared and Laser Engineering, 2022, 51(3): 20210400
- Infrared and Laser Engineering
- Vol. 51, Issue 3, 20210400 (2022)
Fig. 1. System for measuring based on laser feedback interferometry. ML: Nd:YVO4 microchip laser; BS: Beam splitter; PD: Photodetector; AOM1 and AOM2: Acousto-optic modulators; L1 and L2: Lens; W: Wollaston prism. MR: Reference mirror; S: Material; ME: Measurement mirror
Fig. 2. Schematic diagram of optical path for differential frequency shift of acousto-optic modulators. ①~⑧: Eight output laser beams
Fig. 3. Schematic diagram of the sample material optical path
Fig. 4. (a) Theoretical and experimental data of optical path change of two materials with angle of rotation; (b) Difference between theoretical fit data and experimental data
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Table 1. The average optical path difference in Sapphire Crystal with angle
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Table 2. The average optical path difference in GaAs with angle
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Table 3. Measurement results
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