研究目的
Investigating the effects and visibility of low-order aberrations on laser beams with orbital angular momentum.
研究成果
The study demonstrates that the 'donut-like' focus of a modified Laguerre–Gaussian beam is extremely sensitive to off-axis wavefront deformations, with astigmatism being the most critical aberration. The findings can be used to setup the specifications for the optical elements, correction and detection systems employed in a laser facility aiming at working with beams with orbital angular momentum.
研究不足
The study is limited to low-order aberrations and does not cover high-order aberrations or dynamic aberrations caused by air turbulence. The experimental setup may have systematic errors due to inhomogeneous intensity distribution in the near field.
1：Experimental Design and Method Selection:
The study involved generating a Laguerre–Gaussian-like laser beam and applying a selection of common low-order wavefront aberrations to investigate their visibility in the far field.
2：Sample Selection and Data Sources:
A continuous-wave fiber laser at 1053 nm was used as a light source.
3：List of Experimental Equipment and Materials:
The setup included a collimating lens, a serrated aperture, a deformable mirror, a spatial filter, and cameras for near field and far field measurements, as well as a Shack–Hartmann sensor.
4：Experimental Procedures and Operational Workflow:
The beam was relay imaged through a spatial filter onto a deformable mirror to add arbitrary aberrations, measured by a wavefront sensor. The far field with orbital angular momentum was then measured.
5：Data Analysis Methods:
The visibility of aberrations was evaluated using a generalized Strehl ratio and the ring contrast as quality criteria.
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