It has been demonstrated that a Bi12SiO20 crystal is a good holographic recording medium. Using this crystal as a real-time recording device, a two-wavelength holographic interferometer has been constructed. The 488- and 514.5-nm lines of an Ar-ion laser were used as the source to yield an equivalent wavelength of 9.47 μm.
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Lam et al. (1984) studied this question.
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