Holographic Femtosecond Laser Parallel Processing Method Based on the Fractional Fourier Transform

A novel holographic femtosecond laser parallel processing method based on the fractional Fourier transform is proposed, which increases the flexibility of the processing position of the parallel beam as well as the available space in the paraxial area. Computer-generated holograms are produced by combining the fractional Fourier transform and an iterative algorithm with excellent uniformity and diffraction efficiency. Parallel processing can be implemented for complex microstructures by adjusting the femtosecond laser beam using a spatial light modulator. The zero-order beam spot can be actively defocused by changing the fractional order method or exploited to fabricate various structures to improve laser energy utilization.

Automated summary

This novel holographic femtosecond laser parallel processing method utilizes the fractional Fourier transform to increase flexibility and available space for processing, with computer-generated holograms and an iterative algorithm for uniformity and efficiency. By adjusting the femtosecond laser beam using a spatial light modulator, complex microstructures can be processed in parallel, with the zero-order beam spot defocused or utilized to improve laser energy utilization for various structures.