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.

Active Publication Date: 2013-09-25
无锡奥普顿光电子有限公司
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Problems solved by technology

The Pasienski algorithm is superior to the traditional GS algorithm. However, the experiment found that there are still obvious reconstruction errors and spots in the reconstructed image based on the Pasienski algorithm.

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  • Method for outputting images by utilization of phase modulator
  • Method for outputting images by utilization of phase modulator
  • Method for outputting images by utilization of phase modulator

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Embodiment Construction

[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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Abstract

The invention provides a method for outputting images by the utilization of a phase modulator. The method for outputting the images by the utilization of the phase modulator comprises the steps that (1) an initial inputting optical field is determined; (2) Fourier transform is conducted on the current inputting optical field; (3) amplitude of an objective image is used for replacing amplitude of a result of the Fourier transform in the step (2), wherein the objective image is an image which is obtained after an original objective image is softened; (4) Fourier transform is conducted on the result of the step (3); (5) a component of amplitude of the inputting optical field obtained in the step (1) is used for replacing amplitude of the result of the step (4) in a component mode, so that a new inputting optical field which is iterated next time is obtained; (6) the step (2), the step (3), the step (4), the step (5) are repeated till the condition of stopping iteration is met, and therefore a modulated phase needed by the phase modulator for generating the objective image is obtained; (7) the modulated phase obtained in the step 6 is used for outputting a reconstructed image. The method can effectively restrict reconstruction errors and spots, and is suitable for various complex objective images.

Description

technical field [0001] The invention relates to the field of optical technology, in particular, the invention relates to a method for outputting images by using a phase modulation device. Background technique [0002] Using the phase modulation device to output the image is to perform certain phase modulation on the incident laser beam through the phase modulation device to change the power density distribution of the laser beam, so as to reconstruct the output image consistent with the desired target image. Among them, the phase modulation device is an important device in computer generated holograms (CGH) technology. Typical phase modulation devices include static pre-engraved diffractive optical elements (DOEs) and dynamic spatial light modulators (spatial light modulators, SLM), such as liquid crystal on silicon (LCOS), which Both types of phase modulation devices can be used to reconstruct images. [0003] According to different readout methods of readout light, phase...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06F17/14
Inventor 刘劲松
Owner 无锡奥普顿光电子有限公司
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