Method for outputting images by utilization of phase modulator
A phase modulation and image technology, applied in the optical field, can solve the problem of reconstruction error and speckle of reconstructed image, and achieve the effect of suppressing reconstruction error, suppressing and speckle, and having a wide range of applications.
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[0057] As mentioned above, in the prior art, there are various schemes for outputting images by using phase modulation devices. Among them, the Pasienski algorithm is a relatively advanced modulation phase calculation method in the prior art. Starting from the Pasienski algorithm, the inventor of this case conducted an in-depth study on the reconstruction error and speckle problems existing in the image reconstruction process in the prior art. The inventor of this case noticed that the Pasienski algorithm uses a truncated Gaussian beam as the input laser beam. This truncation leads to a sudden change in the spatial domain of the amplitude component of the initial input light field, and the inventor found that if this sudden change is suppressed, the output image The reconstruction error and speckle will be greatly reduced. The reason is as follows: the GS algorithm and its derivative algorithms (such as the Pasienski algorithm) use the Fast Fourier Transform (FFT) algorithm wh...
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