System and method for adjusting and compensating high-order dispersion through broadening-compression coordination

By adjusting the grating incident angle and effective distance of the stretcher and compressor, the second-order and third-order dispersion in the femtosecond laser system are synchronously compensated, the pulse distortion problem caused by the third-order dispersion is solved, and high-quality near-conversion-limited pulse output is achieved.

CN120601237AActive Publication Date: 2025-09-05SHANDONG UNIV
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Patent Information

Application Number
CN202511106103.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-08
Publication Date
2025-09-05
Estimated Expiration
2045-08-08

AI Technical Summary

Technical Problem

In existing femtosecond laser systems, third-order dispersion causes pulse distortion, and there is a lack of effective compensation methods, which affects the pulse quality and time resolution.

Method used

By adjusting the incident angle of the expander's grating and the effective distance of the compressor's grating, synchronous compensation of the second-order and third-order dispersion in the ultrafast laser system can be achieved. By using a transmission or reflection grating, the incident angle and distance are calculated in combination with the grating equation, and the optical path structure is adjusted to achieve pulse output close to the conversion limit.

Benefits of technology

No additional optical elements are required, the structure is simple, and the adjustment freedom is high. It can effectively compensate for third-order dispersion and improve the quality and stability of the output pulse of the ultrafast laser system. It is suitable for systems with limited space or high quality requirements.

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Abstract

The invention belongs to the field of laser emission devices, and provides a system and a method for adjusting and compensating high-order dispersion through broadening-compression coordination, and the method comprises the steps: calculating second-order dispersion and third-order dispersion introduced by a pulse amplifier; the introduced third-order dispersion is adjusted by changing the grating incidence angle in the pulse stretcher, so that the introduced third-order dispersion is counteracted with the total third-order dispersion of the system; according to the second-order dispersion change generated after the angle of the pulse stretcher is adjusted, a second-order dispersion value required to be provided by the pulse compressor is calculated, and the effective distance of the grating pair is adjusted for accurate compensation; and the angle of the pulse stretcher is corrected again according to the third-order dispersion feedback adjusted by the pulse compressor, and the steps are repeated until the total second-order dispersion and the third-order dispersion of the system approach to zero, so that near-transformation limit compression is realized. By adjusting the grating incident angle of the stretcher and the grating effective distance of the compressor, synchronous compensation of second-order and third-order dispersion in the ultrafast laser system is realized, and pulse output close to the transformation limit is obtained.
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