A Method of Using Phase Modulation Device to Output Image

A phase modulation and image technology, which is applied in the field of optics, can solve problems such as reconstruction error spots in reconstructed images, and achieve the effect of suppressing reconstruction errors, suppression and spots, and a wide range of applications

Active Publication Date: 2016-04-20
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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  • A Method of Using Phase Modulation Device to Output Image
  • A Method of Using Phase Modulation Device to Output Image
  • A Method of Using Phase Modulation Device to Output Image

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Embodiment Construction

[0057] As mentioned above, in the prior art, there are many schemes for outputting images using phase modulation devices. Among them, the Pasienski algorithm is a relatively advanced modulation phase calculation method in the prior art. The inventors of the present application start with the Pasienski algorithm and conduct in-depth research on the reconstruction error and speckle problems existing in the process of reconstructing images in the prior art. The inventor of this case noticed that the Pasienski algorithm used a Gaussian beam with truncated surrounding as the input laser beam, and this truncation resulted in a sudden change in the spatial domain of the amplitude component of the initial input light field, and the inventor found that if the sudden change was suppressed, the output image The reconstruction error and speckle will be greatly reduced. The reasons are as follows: the GS algorithm and its derivative algorithms (such as the Pasienski algorithm) use the fast...

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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 present invention relates to the field of optical technology, and in particular, the present invention relates to a method for outputting an image using a phase modulation device. Background technique [0002] Using the phase modulation device to output an image is to perform a certain phase modulation on the incident laser beam through the phase modulation device to change the power density distribution of the laser beam, thereby reconstructing an output image consistent with the desired target image. Among them, the phase modulation device is an important device in computer holography (computergenerated holograms, CGH) technology. Typical phase modulation devices include static prefabricated diffractive optical elements (DOEs) and dynamic spatial light modulators (spatial light modulators, SLM), such as liquid crystal on silicon (LCOS), both of which are phase modulation devices. Can be used to reconstruct images. [0003] According to the diff...

Claims

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Application Information

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Patent Type & Authority Patents(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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