A Sensitivity Enhancement Method Based on Moiré Fringe Interferometric Phase Shift
A moiré fringe and interference phase shift technology, which is applied in the direction of instruments, measuring devices, and optical devices, can solve the problems of insufficient sensitivity of interference phase shift and small offset of optical path difference, so as to improve sensitivity, improve sensitivity, good compatibility
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Embodiment 1
[0030] Embodiment 1 of the present invention is a method for enhancing the sensitivity of an interference phase shift of a fixed-delay interference instrument by using Moiré fringes.
[0031] like figure 1 As shown, the interference fringe light field 1 output by the fixed-delay interferometer is generated by a laser with a wavelength of 633nm. The aperture of the interference fringe light field is 25mm. Period is 260μm, such as figure 2 As shown, according to the formula It can be obtained that the divergence angle of the interference fringe light field is about 1.2 mrad, which is similar to a beam of parallel light beams carrying interference fringe distribution. The parallel light beam first passes through the polarizer 2, so that the polarization direction of the interference fringe light field 1 is 45° to the vertical direction, ensuring that the light intensity of the p-polarization component and the s-polarization component are equal, and then vertically incident on...
Embodiment 2
[0033] Embodiment 2 of the present invention is a method for enhancing the sensitivity of the interferometric phase shift of an asymmetric spatial heterodyne interferometer by using Moiré fringes.
[0034] like Figure 4 As shown, the interference fringe light field 1 output by the asymmetric spatial heterodyne interferometer is produced by the green line of oxygen atoms with a wavelength of 557.7nm. The period is 200μm, such as Figure 5 As shown, according to the formula It can be obtained that the divergence angle of the interference fringe light field is about 1.4mrad, which is similar to a beam of parallel light beams carrying interference fringe distribution. Since the light source is natural light, has no polarization characteristics, and the coherence length is very short, interference between the two sets of interference fringes formed on the detector is impossible, so there is no need to add a polarizer in the optical path. This parallel light beam is vertically i...
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