Abstract
A high birefringent beta-barium borate (BBO) plate is proposed for an optical angle sensor in a homodyne interferometer. Simulations show that the angle measurement sensitivity can be improved by reducing a relative refractive index between the BBO plate and the environmental medium. Thus, the BBO plate is immersed in a square glass container filled with grapeseed oil. According to the optimization of an initial incident angle, linear dynamic measurement is achievable in the experiments for both probing wavelengths of 532 nm and 632.8 nm. Finally, the best angular displacement resolution of 1.5 ×10-5° is achievable in angular displacements of 5° by using the probing wavelength of 632.8 nm.
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