Continuous terahertz wave self-reference digital holographic imaging method based on Fresnel double-sided mirror

Abstract

The invention discloses a continuous terahertz wave self-reference digital holographic imaging method based on a Fresnel double-sided mirror. According to the method, high-time-stability common-optical-path off-axis interference holography can be achieved only through few optical elements. The method has the advantages that the number of required optical elements is small, the optical path structure is compact, the period of interference fringes can be flexibly adjusted, and the sampling condition of the detector can be better met. Because the intensities of the object light and the referencelight on are cording plane are almost equal, interference fringes with consistent contrast can be obtained, and the reproduction of an amplitude image and a phase image and the improvement of the precision are facilitated. Under the conditions of the same recording duration and unchanged experimental conditions, experiments prove that the recording device provided by the invention has higher timestability than the traditional optical path system based on a Mach-Zehnder interferometer structure.

Description

technical field [0001] The present invention relates to a method for self-referencing digital holography to improve system time stability, in particular to a continuous terahertz wave self-referencing digital holographic imaging method based on a Fresnel double-sided mirror, which is a continuous terahertz wave based on a common optical path structure. Hertzian wave self-referencing digital holography method. Background technique [0002] Terahertz digital holography can be used to reconstruct object wavefronts in real time. The effectiveness of this full-field lensless terahertz phase-contrast imaging method has been widely used in off-axis interferometer configurations. The commonly used experimental recording optical path in the terahertz digital holography method is based on the Mach-Zehnder interferometer's terahertz off-axis interference structure that makes the object and reference beams have an angle. However, due to the different propagation paths of the object bea...

AI Technical Summary

Problems solved by technology

The commonly used experimental recording optical path in the terahertz digital holography method is based on the Mach-Zehnder interferometer's terahertz off-axis interference structure that makes the object and reference beams have an angle. However, due to the different propagation paths of the object beam and the reference beam, the two beams Environmental interference and vibration are usually sensitive, and there is inevitably a difference in the split intensity ratio of the two beams

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