A point-diffraction digital holographic microscope device and method based on polarization grating
A technology of digital holographic microscopy and polarization grating, which is applied in the direction of using optical devices, measuring devices, and material analysis through optical means. It can solve the problems of fringe contrast that cannot guarantee high interference patterns, and achieve high precision and high stability. , the effect of suppressing coherent noise
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[0074] In the experiment, laser 1 is a LQB crystal solid-state laser (λ=532nm, 1875M-532-(10-50)-5V, radium blue laser, Wuhan, China), the exit spot diameter: 4mm; wavelength range: 532nm±5nm (half Height full width 10nm); linear polarization and the polarization direction is the horizontal direction; price: 150RMB. The magnification of the microscope objective 4 is 20X, and the numerical aperture NA=0.4 (plan objective lens, 20×LWD, Nanjing Yingxing, Nanjing, China). The first thin lens 5 focal length f 1 =150mm (AC254-150-A, ThorlabsInc., USA); the focal length of the second thin lens 8 is f 2 =50mm (GCL-010652, Daheng Optoelectronics, Beijing, China). The pinhole diameter of the pinhole filter is 50 μm (GC0-01020, Daheng Optoelectronics, Beijing, China); the period of the grating 7 is Λ=6.3 μm (#12-677, Edmund Optics, Shenzhen, China). Because (1 / Λ=1 / 6.3=0.16μm -1 )>(2ν max =2 / (0.61λ / NA) / M=0.12μm -1 , M is the magnification of the objective lens), so the device can se...
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