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A density-weighted composite modulation method for pure-phase spatial light modulators

A technology of spatial light modulator and compound modulation, which can be used in instruments, optics, nonlinear optics, etc., and can solve the problem that a single spatial light modulator cannot modulate amplitude and phase.

Inactive Publication Date: 2019-11-29
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Currently a single spatial light modulator cannot simultaneously and independently modulate amplitude and phase

Method used

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  • A density-weighted composite modulation method for pure-phase spatial light modulators
  • A density-weighted composite modulation method for pure-phase spatial light modulators
  • A density-weighted composite modulation method for pure-phase spatial light modulators

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specific Embodiment approach 1

[0028] Specific implementation mode one: combine Figure 1 to Figure 3 This embodiment will be described. The synchronous realization of the amplitude modulation and phase modulation based on the phase-only liquid crystal spatial light modulator described in this embodiment, the spatial light modulator may be a reflective spatial light modulator or a transmissive spatial light modulator.

[0029] In this implementation manner, a transmissive pure phase liquid crystal spatial light modulator is taken as an example.

[0030] Step 1: divide multiple pixels of the spatial light modulator into multiple sub-regions.

[0031] Step 2: Divide the points in each sub-region into two groups. The first group of pixels can be concentrated to remove the energy of the group of pixels through a linear phased array phase modulation. After the original beam is modulated, only the second group remains. The energy of the group of pixels.

[0032] Linear Phased Array Phase Satisfy:

[0033] ...

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Abstract

The invention relates to a density weighted complex modulation method of a pure phase type spatial light modulator. The density weighted complex modulation method comprises the following steps of S1:separating the pixels of the spatial light modulator into multiple sub-areas, wherein the pixels in each sub-area are separated into two groups; a plurality of pixel points are contained in each group; S2, carrying out phased array modulation on the pixels of a first group in any sub-area, wherein the energy of the pixel points of the group can be concentrated by the phased array modulation; whenthe energy of the pixels of the first group is shifted out, the energy of the pixels of a second group only remains in an original light beam after the modulation; the density weighed amplitude modulation of an entire pixel plane is realized through controlling the energy of the pixel points of the first group in each sub-area; S3, carrying out the phased array modulation on the pixels of the second group in any sub-area, wherein the pure phase type spatial light modulator can be used for directly realizing phase modulation on the pixel points of the second group. The amplitude modulation andthe phase modulation can be synchronously and independently realized through such a way.

Description

technical field [0001] The invention relates to the field of optical modulation, in particular to phase modulation and amplitude modulation of light. Background technique [0002] The phase-type liquid crystal spatial light modulator is a device capable of phase-modulating the spatial beam, and is used to modulate the phase signal of the original beam to the required form. The phase-type liquid crystal spatial light modulator contains several independent modulation units, which form a one-dimensional or two-dimensional array in space, and each unit can independently receive the control of an optical signal or an electrical signal, and operate according to this signal. By changing their own optical properties, these devices can often change the amplitude or phase, as well as the polarization state, of the light distribution in space. [0003] In recent years, liquid crystal spatial light modulators have been widely used in imaging, projection, coherent wavefront modulation, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/29G02F1/13
CPCG02F1/13G02F1/292
Inventor 张蓓刘雨闫鹏
Owner BEIHANG UNIV
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