研究目的
To propose an in-line and off-axis hybrid holographic method for imaging reflective objects, improving the quality of amplitude and phase images compared to traditional methods.
研究成果
The proposed hybrid digital holography method effectively combines the advantages of in-line and off-axis digital holography, producing higher quality amplitude and phase images of reflective objects. It has been successfully demonstrated on a resolution target and a microelectronic chip, showing good application prospects for wide field view detection of reflective objects.
研究不足
The method requires precise alignment and calibration of the optical setup. The presence of speckle noise can affect the quality of the reconstructed images, and the method may not be suitable for objects with very high phase fluctuations.
1：Experimental Design and Method Selection:
The study uses a Michelson interferometer to record in-line and off-axis digital holograms. Spectral filtering and phase retrieval are combined in the hybrid reconstruction algorithm.
2：Sample Selection and Data Sources:
A resolution target and a microelectronic chip are used as reflective objects.
3：List of Experimental Equipment and Materials:
A laser beam with a wavelength of 532 nm, spatial filter (SF), collimating lens, beam splitter (BS), mirror, and a consumer digital camera (NEX-7 Sony).
4：Experimental Procedures and Operational Workflow:
The object beam is reflected by the object and forms the object beam incident on the recording plane. The reference beam is reflected by a mirror and the BS. The in-line and off-axis holograms are recorded and processed using the proposed hybrid method.
5：Data Analysis Methods:
The phase in the recording plane is extracted from the off-axis hologram by spectral filtering approach and used as an initial value in the phase retrieval of the in-line hologram.
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