研究目的
To improve the illumination uniformity of laser quad in multi-directions by combining smoothing by spectral dispersion, radial smoothing, and azimuthal smoothing schemes.
研究成果
The combined implementation of SSD, RS, and AS significantly improves the illumination uniformity of laser quad in multi-directions within a few picoseconds. Optimal parameters include a wavelength difference of 0.1 nm and integer topological charges for effective smoothing.
研究不足
The smoothing performance of azimuthal smoothing is limited by low rotation speed in the central area of the focal spot. The coherence time and wavelength difference also constrain the effectiveness of the combined scheme.
1：Experimental Design and Method Selection:
The study combines smoothing by spectral dispersion (SSD), radial smoothing (RS), and azimuthal smoothing (AS) to improve laser beam uniformity. Theoretical models for the combined scheme are developed.
2：Sample Selection and Data Sources:
Laser beams with specific parameters are used, including a fundamental wavelength of 1053 nm and a third harmonic generation wavelength of 351 nm.
3：List of Experimental Equipment and Materials:
Includes continuous phase plates (CPP), polarization control plates (PCP), spiral phase plates (SPP), optical Kerr media (nitrobenzene), and lenses.
4：Experimental Procedures and Operational Workflow:
Laser beams are modulated by SSD, transformed into vortex beams by SPPs, and focused. The intensity distribution and uniformity are analyzed.
5：Data Analysis Methods:
Contrast of focal spots and fraction of power above intensity (FOPAI) are calculated to evaluate uniformity. Power spectral density (PSD) curves illustrate spatial modulation.
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