Interference type double-imaging measurement device for multi-parameters of liquid crystal spatial light modulator

A spatial light modulator, imaging measurement technology, applied in optics, instruments, nonlinear optics, etc., can solve problems such as the inability to meet the requirements of multi-parameter measurement, achieve accurate acquisition, avoid additional errors, and improve measurement efficiency.

Inactive Publication Date: 2009-10-14
HARBIN UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing liquid crystal spatial light modulator characteristic parameter measurement device cannot meet the requirements of multi-parameter measurement, the present invention proposes a multi-parameter interferometric dual-imaging measurement device for liquid crystal spatial light modulator

Method used

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  • Interference type double-imaging measurement device for multi-parameters of liquid crystal spatial light modulator
  • Interference type double-imaging measurement device for multi-parameters of liquid crystal spatial light modulator
  • Interference type double-imaging measurement device for multi-parameters of liquid crystal spatial light modulator

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specific Embodiment approach 1

[0008] Specific implementation mode one: combine image 3 Description of this specific embodiment, a multi-parameter interferometric dual imaging measurement device of a liquid crystal spatial light modulator, which includes a beam expander 2, a polarizer 3, a first dichroic prism 4, a reflector 6, and a liquid crystal spatial light modulator 7. Analyzer 8, photodiode 12 and CCD detector 16, a multi-parameter interferometric dual imaging measuring device of a liquid crystal spatial light modulator also includes a switchable shutter 5, a second dichroic prism 9, and a first imaging lens 10 , pinhole 11, two-dimensional micro-motion stage 13, second imaging lens 14, aperture 15 and computer 17; the laser beam input by the system is incident on the beam expander 2, and after being expanded and shaped by the beam expander 2, it is incident on the polarizer device 3, after being polarized by the polarizer 3, it enters the first dichroic prism 4, and the first dichroic prism 4 divid...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination Figure 4 Describe this specific embodiment, the difference between this specific embodiment and the multi-parameter interferometric dual imaging measurement device of a liquid crystal spatial light modulator described in the first specific embodiment lies in the transmission axis of the polarizer 3 and the polarizer 8 The light transmission axes are all parallel to the liquid crystal optical axis direction of the liquid crystal spatial light modulator 7, and the switch shutter 5 can be set to an open state.

[0017] The device of this embodiment is in the interference state of two optical paths, and the polarizer 3 and the analyzer 8 are adjusted so that the light transmission axis 100 of the polarizer 3 and the light transmission axis 102 of the analyzer 8 are parallel to the liquid crystal spatial light modulator 7 in the direction of the liquid crystal optical axis 101, after the system input light beam is polarized by t...

specific Embodiment approach 3

[0018] Specific implementation mode three: combination Figure 5Describe this specific embodiment. The difference between this specific embodiment and the multi-parameter interferometric dual imaging measurement device of a liquid crystal spatial light modulator described in Embodiment 1 is that the light transmission axis of the polarizer 3 and the polarizer 8 The light transmission axes of the liquid crystal spatial light modulator 7 and the liquid crystal optical axis direction form an angle of 45°, and the switchable shutter 5 can be set to a closed state.

[0019] The device of the present embodiment is in the co-path interference state, and the polarizer 3 and the analyzer 8 are adjusted so that the polarization directions of the transmission axis 100 of the polarizer 3 and the transmission axis 102 of the analyzer 8 are consistent with the liquid crystal space light. The liquid crystal optical axis 101 of the modulator 7 forms an angle of 45°. After the system input bea...

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Abstract

An interference type double-imaging measurement device for multiple parameters of a liquid crystal spatial light modulator relates to the technical field of photo-electricity test. The invention solves the problem that the characteristic parameter measurement device of the existing liquid crystal spatial light modulator can not satisfy the requirement of multi-parameters measurement. By introducing a double-imaging system in a Twyman-Green interference light path, the invention integrates the double light path interference and common path interference into a device. Input light enters in a first dispersion prism through a beam expanding lens and a polarizer. Transmitted light is modulated and reflected by the liquid crystal spatial light modulator and then reflected by a reflecting mirror through a shutter. The two-way lights enter in a second imaging system through a second dispersion prism after passing through the first dispersion prism and an analyzer. After reflected by the liquid crystal spatial light modulator, the transmitted light can also directly enter in a first imaging system through the first dispersion prism, the analyzer and the second dispersion prism. The invention realizes the measurement of multi-parameters by using the double-imaging system to respectively detect phase and strength. The measurement device is applicable to the measurement process of multi-parameters of the liquid crystal spatial light modulator.

Description

technical field [0001] The invention relates to the technical field of photoelectric testing. Background technique [0002] The liquid crystal spatial light modulator can change the phase, polarization state, amplitude (or intensity) and even wavelength of the light distribution in space under the control of the electric drive signal, or convert incoherent light to coherent light, etc. The modulation of phase and amplitude plays a very important role in optical information processing, so liquid crystal spatial light modulators have important application values ​​in wavefront correction, atmospheric imaging, optical filtering, and beam shaping. The test of the characteristic parameters of the liquid crystal spatial light modulator (the characteristic parameters mainly include: phase modulation characteristics, amplitude modulation characteristics, phase inhomogeneity and time response characteristics, etc.) is the key to grasp the performance of the device. The current measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G01M11/02
Inventor 张洪鑫张健吴丽莹
Owner HARBIN UNIV OF SCI & TECH
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