A digital holographic recording device with real-time precision adjustable off-axis angle
A technology of digital holography and recording devices, applied in the direction of instruments, etc., can solve problems such as difficult to measure distance accurately, low efficiency, incorrect off-axis angle, etc., achieve the effect of correcting object light recovery error, improving experimental efficiency, and easy realization
Inactive Publication Date: 2018-07-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0005] (1) The current off-axis holographic optical path adjustment is mainly determined by the experience and skills of the experimenters. There is no mature technology to accurately determine the off-axis angle, and it is impossible to accurately control the off-axis angle.
[0006] (2) When determining the off-axis angle, the off-axis angle is calculated mainly by the ratio of the distance between the object light and the reference light spot and the propagation distance after beam splitting. However, since the object light and the reference light spot have a certain size , the distance between them is difficult to accurately measure, and it is easy to cause incorrect off-axis angles, which can only be adjusted repeatedly, and the efficiency is low
[0008] (4) The existing technology needs to adjust the off-axis angle in advance, and cannot change and detect the off-axis angle in real time according to the needs of the experiment process, which brings inconvenience to the experiment and affects the experimental effect and accuracy
[0010] (6) Studies have shown that the tilt of the coaxial holographic reference light will introduce errors into the restored object light, causing the wavefront of the reconstructed object light to bend, reducing the measurement accuracy and imaging quality
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[0037] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0038] combine figure 1 As shown, a digital holographic recording device with real-time precision adjustable off-axis angle, including laser light source 1, No. 1 beam splitter 2, No. 2 beam splitter 3, No. 1 beam combiner 4, and No. 2 beam combiner 5 , No. 1 reflector 6, No. 2 reflector 7, No. 3 reflector 8, No. 1 spatial filter beam expander collimation system 12, No. 2 spatial filter beam expander collimator system 13, No. 1 CCD9, No. 2 CCD10 and computer 11. in,
[0039] Based on the No. 1 beam splitter 2, the No. 2 beam combiner 5, the No. 1 mirror 6 and the No. 3 mirror 8, a No. 1 rectangular interference optical path is formed for holographic interference recording.
[0040] Based on the No. 2 beam splitter 3, the No. 1 beam combiner 4, the No. 2 reflector 7 and the No. 3 reflector 8, a No. 2 rectangular interference optical path is fo...
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The invention discloses a digital holographic recording device whose off-axis angle can be precisely adjusted in real time. Compared with the digital holographic recording device in the prior art, the present invention adds a small monitoring optical path and a method of adjusting the fine-tuning screw of the mirror to control and measure the off-axis angle. Using the designed optical path generated by the digital holographic recording device of the present invention, the reflection direction of the detection reference light can be adjusted to realize the conversion of coaxial and off-axis holography; the off-axis angle can also be adjusted and detected to obtain the best off-axis in off-axis holography Angle, so that the original object image can be just separated, effectively using the resolution and spatial bandwidth of the CCD; it can also correct the object light recovery error caused by the slight tilt of the reference light in coaxial digital holography.
Description
technical field [0001] The invention relates to a digital holographic recording device whose off-axis angle can be precisely adjusted in real time. Background technique [0002] Among many three-dimensional imaging and display technologies, holography is one of the most effective three-dimensional imaging technologies so far. This technology uses the reference light as the carrier wave to interfere with the object light wave to form interference fringes. The object light information (including amplitude and phase) is solidified into the interference fringes to form a hologram. Diffraction out, continue to propagate forward. In order to avoid the interference of direct light and negative primary image during reproduction, an off-axis recording method is usually used, that is, there is a certain angle between the reference light and the propagation direction of the object light. In holographic recording, the resolution of the recording medium limits the maximum value of the ...
Claims
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IPC IPC(8): G03H1/10
CPCG03H1/10
Inventor 徐先锋张格涛白芬张会展凯云张志伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)