研究目的
To develop a three-wavelength light source (RGB laser) for color digital holography that allows simultaneous acquisition of three spectral interferograms for analyzing the specimen’s spectral properties and phase structure.
研究成果
The proposed RGB laser generates highly synchronized pulses at red, green, and blue wavelengths, enabling simultaneous acquisition of three spectral digital holographic images. Its design eliminates the need for beam combining techniques, making it attractive for color digital holography applications. The laser's performance was validated through experiments with a Fresnel lens, showing good correspondence with atomic force microscope measurements.
研究不足
The study focuses on the development and initial application of the RGB laser in digital holography, with potential limitations in the power balance between the three wavelengths and the need for precise alignment and voltage adjustment for optimal performance.
1：Experimental Design and Method Selection:
The study involves the development of a pulsed RGB laser based on the Nd:YAG active element and KTP crystals for generating red, green, and blue wavelengths. The methodology includes optical parametric generation, sum-frequency generation, and second-harmonic generation in nonlinear KTP crystals.
2：Sample Selection and Data Sources:
The experiment uses a Fresnel lens etched in the photoresist SU-8 as the sample to demonstrate the laser's application in digital holographic microscopy.
3：List of Experimental Equipment and Materials:
Includes Nd:YAG active element, KTP crystals, xenon lamp, electro-optical modulator, polarizing beamsplitter, mirrors, beam combiner, diaphragm, and a color camera with a Bayer filter image sensor.
4：Experimental Procedures and Operational Workflow:
The laser setup involves generating synchronized pulses at three wavelengths, combining them into a single beam, and using them in a Mach-Zehnder interferometer setup for digital holographic microscopy.
5：Data Analysis Methods:
The color digital hologram is divided into three images (red, green, blue), each processed through Fourier transform, phase extraction, unwrapping, and correction to obtain phase maps of the object.
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