研究目的
To demonstrate a resolution beyond the classic diffraction limit using a special type of interferenceless coded aperture correlation holography (I-COACH) with a point spread hologram (PSH) that is an ensemble of sparse dots.
研究成果
The study successfully demonstrated a resolution enhancement beyond the diffraction limit using I-COACH with sparse PSH. The technique achieved a lateral resolution enhancement by a factor of about 1.6 for transmission objects and 1.4 for reflective objects compared to direct imaging. The method's simplicity and lack of complex computational procedures make it advantageous for resolution improvement without loss of time resolution.
研究不足
The method is limited to spatially incoherent illumination and requires the introduction of a CPM between the object and the system entrance, which may not be feasible for all optical systems without modification.
1：Experimental Design and Method Selection:
The study utilizes a modified I-COACH system with sparse PSH for resolution enhancement. The methodology involves the use of a coded phase mask (CPM) and a diffractive lens (DL) to scatter light into the optical system, thereby extending the effective numerical aperture.
2：Sample Selection and Data Sources:
The experiments were conducted using a United States Air Force (USAF) resolution transmission target and a reflective USAF target as objects.
3：List of Experimental Equipment and Materials:
The setup included LEDs (Thorlabs LED635L), lenses (L0A and L0B), a spatial light modulator (SLM) (Holoeye PLUTO), a digital camera (Retiga-R6), and an iris for controlling the initial NA of the lens-based system.
4：Experimental Procedures and Operational Workflow:
The phase pattern on the SLM was generated by the modulo-2π phase addition of the CPM with the DL. The GSA was used to generate the CPM with varying scattering degrees and dot numbers. The object reconstruction was done by nonlinear cross-correlation of the object hologram with the PSH.
5：Data Analysis Methods:
The reconstruction results were analyzed using visibility and SNR values, with the product of visibility and SNR determining the optimal scattering degree and dot number.
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