Speckle generating device and method with adjustable contrast value
A technology for generating devices and contrast, applied in measuring devices, optical devices, instruments, etc., can solve the problems of lack of speckle generating devices and methods, and achieve the effect of simple devices and simple principles
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[0026] Below in conjunction with example the present invention will be further described.
[0027] Such as figure 1 As shown, a speckle generating device with adjustable contrast value includes a continuous wave laser 100. The continuous wave laser 100 adopts a He-Ne laser with a wavelength of 632.8nm and a power of 1mW. The beam of the continuous wave laser 100 advances The direction is provided with a beam scaler 110, a polarizer 121, a diaphragm 130, a spatial light modulator 200, an analyzer 122, a Fourier lens 140, and a CCD camera 300 in sequence;
[0028] The spatial light modulator 200 and the CCD camera 300 are respectively connected with the computer 400; the image on the spatial light modulator 200 is written by the computer 400; The beam waist size of the laser beam on the modulator 200; the spatial light modulator 200 is located on the front focal plane of the Fourier lens 140, and the CCD camera 300 is located on the back focal plane of the Fourier lens 140;
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