An electronically controlled beam deflection device, cascaded structure, and beam deflection driving method
A technology of beam deflection and driving method, which is applied in optics, nonlinear optics, instruments, etc., and can solve problems such as slow response speed
Active Publication Date: 2022-02-01
重庆晶朗光电有限公司
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[0004] The object of the present invention is to provide a fast-response electronically controlled beam deflection device, cascaded structure, and beam deflection driving method. problem, can be well applied directly to occasions requiring a quick response
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[0020] Such as Figure 1 to Figure 3 As shown, the electronically controlled beam deflection device 60 of the present invention includes a first ferroelectric liquid crystal element 10, a second ferroelectric liquid crystal element 20 and a polarization grating 30 coaxially stacked along the optical axis L, the first ferroelectric liquid crystal element 10, the second ferroelectric liquid crystal element The lamination between the second ferroelectric liquid crystal element 20 and the polarization grating 30 should try to avoid air gaps, wherein: the phase retardation of the first ferroelectric liquid crystal element 10 and the second ferroelectric liquid crystal element 20 are the same and both are (1+2n) ×λ / 4, n=0, 1, 2, 3, . The orientation direction 40 of a ferroelectric liquid crystal element 10 and the orientation direction 50 of the second ferroelectric liquid crystal element 20 form an included angle of 45°; the ferroelectric liquid crystal layers of the first ferroele...
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The invention discloses an electronically controlled light beam deflection device, a cascaded structure, and a light beam deflection driving method. The electrically controlled beam deflection device comprises a first ferroelectric liquid crystal element, a second ferroelectric liquid crystal element and a polarization grating coaxially stacked along the optical axis, wherein: the phase retardation of the first ferroelectric liquid crystal element and the second ferroelectric liquid crystal element is (1+2n)×λ / 4, n is a natural number; the alignment directions of the first ferroelectric liquid crystal element and the second ferroelectric liquid crystal element differ by 45°; the first ferroelectric liquid crystal element and the second ferroelectric liquid crystal element The ferroelectric liquid crystal arrangement of the ferroelectric liquid crystal layer is equivalent to a cone with a semi-cone angle of 22.5°; the first ferroelectric liquid crystal element and the second ferroelectric liquid crystal element are connected to the electric control drive device. The invention realizes the light beam deflection effect of fast response and switching, and the response speed can be shortened to sub-millisecond level, which meets the requirement of non-mechanical fast deflection of the light beam.
Description
technical field [0001] The invention relates to a non-mechanical light beam deflection device, in particular to an electrically controlled light beam deflection device with fast response characteristics, a cascaded structure, and a light beam deflection driving method. Background technique [0002] Non-mechanical beam deflection devices have been widely used in many industries, such as optical communication, laser scanning radar, 3D facial recognition, etc. See the invention patent "Method and Device for Wavelength Selective Switch" with the authorized announcement number CN103703405B, which discloses an optical switch used in the communication industry. This optical switch uses a combination of a liquid crystal unit and a polarization grating unit to control the beam deflection. The liquid crystal unit is an electrically controllable phase retardation device, which can control the left and right rotation of circularly polarized light (the left and right rotation can be real...
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IPC IPC(8): G02F1/141
CPCG02F1/141
Inventor 周盼华孙刚
Owner 重庆晶朗光电有限公司