研究目的
Investigating the creation and control of spatial arrays of optical needles with independent axial intensity distributions for laser microprocessing.
研究成果
The research successfully demonstrates a flexible technique for creating controlled arrays of parallel optical needles with independent axial intensity profiles. It highlights the interplay between separation and individual lengths of optical needles and presents a method to compensate for distortions caused by spherical aberration at air-dielectric interfaces.
研究不足
The study notes physical limitations due to mutual interference of individual beams, especially at closer spatial separations. The use of SLM, while flexible, cannot sustain high laser powers, limiting its application in high-power scenarios.
1：Experimental Design and Method Selection:
The study employs a spatial light modulator (SLM) to model geometrical phase elements and generate Bessel beams with controlled axial intensity patterns and positions.
2：Sample Selection and Data Sources:
The experiment uses an expanded linearly polarized Gaussian beam of wavelength 532 nm.
3：List of Experimental Equipment and Materials:
Phase-only spatial light modulator (SLM), Fourier lens, moving linear translation stage with mounted imaging system, CCD matrix camera, and personal computer for data processing.
4：Experimental Procedures and Operational Workflow:
The beam reflects from the SLM, propagates through a Fourier lens, and forms optical needles in the focal plane. The stage moves to scan along the z-axis, capturing transverse intensity data at different distances.
5：Data Analysis Methods:
The data is processed to analyze the intensity distributions and interference patterns of the optical needles.
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