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Ultrafast two-dimensional imaging for surface defects measurement of mirrors based on a virtually imaged phased-array
Optics Express
|October 19, 2022
Summary
This study presents a new method for ultrafast, single-shot measurement of surface defects on large mirrors used in high-power laser systems. The technique achieves high-speed, 2D imaging of defects, improving laser system monitoring.
Area of Science:
- Optics and Photonics
- Laser Technology
- Materials Science
Background:
- Monitoring surface defects in high-power laser systems is crucial for operational stability.
- Conventional defect measurement methods are limited by slow speeds and narrow dynamic ranges.
Purpose of the Study:
- To develop a high-speed, two-dimensional (2D) surface amplitude-type defect measurement technique.
- To enable real-time monitoring of large-aperture mirrors in high-power laser systems.
Main Methods:
- Utilized ultrafast single-pixel imaging combined with a virtually imaged phased-array.
- Implemented 2D wavelength-to-space mapping via Fraunhofer diffraction and a dispersive Fourier transform for wavelength-to-time mapping.
- Employed interpolation to correct for nonlinear dispersion and reconstruct 2D surface defect images.
Main Results:
- Achieved a frame rate of 7.6 MHz for 2D surface defect reconstruction.
- Obtained 1.5 x 2 mm 2D images within 10 ns.
- Demonstrated spatial resolutions of 180 µm (y-direction) and 140 µm (x-direction).
Conclusions:
- The developed ultrafast 2D surface defect measurement scheme offers a promising solution for real-time monitoring.
- This technique addresses the limitations of conventional methods in speed and dynamic range.
- Enables efficient inspection of large-aperture mirrors critical for high-power laser applications.
