Large-angle, continuous and high-resolution beam deflection scanning device based on liquid crystal optical phased array and scanning method

A technology of liquid crystal optics and beam deflection, applied in optics, optical components, nonlinear optics, etc., to achieve cost-saving and volume-reducing effects

Inactive Publication Date: 2011-05-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the bottleneck of the existing technology that can only realize small-angle beam deflection scanning, and to ensure that the angular resolution can reach the diffraction limit or even higher resolut

Method used

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  • Large-angle, continuous and high-resolution beam deflection scanning device based on liquid crystal optical phased array and scanning method
  • Large-angle, continuous and high-resolution beam deflection scanning device based on liquid crystal optical phased array and scanning method
  • Large-angle, continuous and high-resolution beam deflection scanning device based on liquid crystal optical phased array and scanning method

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine Figure 1 to Figure 12 Describe this embodiment, this embodiment is a large-angle continuous high-resolution beam deflection scanning device based on a liquid crystal optical phased array. A lens or lens array 10, a first liquid crystal optical phased array 11 and The second liquid crystal optical phased array 12,

[0028] Wherein the first liquid crystal optical phased array 11 and the phase shift unit of the second liquid crystal optical phased array 12 have the same pixel size and the same filling factor, and the first liquid crystal optical phased array 11 produces a first liquid crystal lens or a liquid crystal lens array 21 , the second liquid crystal optical phased array 12 produces a second liquid crystal lens or liquid crystal lens array 22 and a blazed grating 23 with variable period or variable blaze,

[0029] The lens or lens array 10, the first liquid crystal lens or liquid crystal lens array 21 and the second liquid...

specific Embodiment approach 2

[0040] Specific implementation mode two: combination Figure 1 to Figure 12 Describe this embodiment, the steps of this embodiment are as follows:

[0041] Step 1: first select the lens or lens array 10, then select the first liquid crystal optical phased array 11 that produces the first liquid crystal lens or liquid crystal lens array 21, and generate the second liquid crystal lens or liquid crystal lens array 22 and variable period or variable blaze The second liquid crystal optical phased array 12 of the blazed grating 23, the selected first liquid crystal optical phased array 11 and each phase shift unit of the second liquid crystal optical phased array 12 have the same pixel size and the same fill factor, and A first liquid crystal lens or liquid crystal lens array 21 and a second liquid crystal lens or liquid crystal lens array 22 having the same effective diameter as the lens or lens array 10 can be produced;

[0042] Step 2: Calculate the initial phase diagram of the ...

specific Embodiment approach 3

[0053] Specific implementation mode three: combination Figure 11 and Figure 12 This embodiment is described. The difference between this embodiment and the second specific embodiment is that the initial phase diagram, the initial composite phase diagram, the deflection phase diagram and the deflection composite phase diagram are obtained through a phase function;

[0054] First, the expression of the eccentricity of the first liquid crystal lens or liquid crystal lens array 21 and the second liquid crystal lens or liquid crystal lens array 22 is:

[0055] Δ(x, y)=(Δ(x), Δ(y))=(x·d x ,y·d y )0≤x≤M / 2, 0≤y≤N / 2

[0056] Among them, x, y are the number of moving steps in the X and Y directions respectively; M and N are the number of phase shift units in the X and Y directions of the phased array respectively; d x , d y The size of the phase shift unit of the liquid crystal phased array;

[0057] The phase function of the phase diagram of the first liquid crystal optical pha...

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Abstract

The present invention relates to a large-angle, continuous and high-resolution beam deflection scanning device based on a liquid crystal optical phased array and a scanning method, relating to the technical field of crossing of liquid crystal optics, applied optics and diffractive optics and solving the problem of the prior art that only small-angle beam deflection scanning can be realized. An angle resolution can reach the diffraction limit or higher while large-angle beam deflection scanning is achieved. The large-angle beam deflection scanning is achieved through a liquid crystal lens or aliquid crystal lens array formed with a lens layer or a lens array layer and two liquid crystal optical phased array layers. A blazed grating phase is added on the liquid crystal optical phased arrayfor beam emergence to realize continuous beam deflection scanning. Finally, the large-angle and continuous beam deflection scanning can be achieved. The device and the method have significant prospects of application in free-space optical communication, laser radars, optical tweezers, laser direct writing, optical interconnection, projection display, optical information storage and other fields.

Description

technical field [0001] The invention belongs to the cross technical fields of liquid crystal optics, applied optics and diffractive optics. Background technique [0002] Using liquid crystal optical phased arrays to realize large-angle continuous beam deflection scanning technology without mechanical inertia programmable control has great potential in the fields of free-space optical communication, laser radar, optical tweezers, laser directing, optical interconnection, projection display, and optical information storage. great application prospects. Among them, laser radar, optical tweezers, laser directing, etc., have an urgent demand for large-angle continuous beam deflection without mechanical inertia and programmable control. However, only the phase modulation characteristics of liquid crystal optical phased arrays are used to form eccentric lenses or lens arrays. Phase distribution Although the large-angle beam deflection technology realizes a large-angle beam deflect...

Claims

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Application Information

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IPC IPC(8): G02F1/29G02B26/10
Inventor 王东张建刘翔甘雨吴丽莹
Owner HARBIN INST OF TECH
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