A space-time pulse shaping method based on a cascaded 4f system

By cascading a 4f system and a spatial light modulator, and using the backpropagation algorithm to train the phase mask, the arbitrary nature and distortion problems of spatial light pulse shaping in existing technologies are solved, and efficient spatial light vortex generation is achieved.

CN116736563BActive Publication Date: 2026-07-21TONGJI UNIV
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Patent Information

Application Number
CN202310660429.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-06
Publication Date
2026-07-21
Estimated Expiration
2043-06-06

AI Technical Summary

Technical Problem

Existing technologies cannot complete the task of optical pulse shaping in arbitrary yt domain spacetime, and the generated STOV exhibits severe distortion and trailing phenomena, making it impossible to generate complex optical field distributions such as OPTICA strings.

Method used

A space-time pulse shaping device based on a cascaded 4f system is adopted. By using a multi-stage cascaded 4f system and a spatial light modulator, the phase mask is trained through the error backpropagation algorithm and the gradient descent method to achieve the shaping of optical pulses in any yt domain.

Benefits of technology

High-quality spacetime optical vortices were generated, enabling the generation of complex optical field distributions, reducing distortion and trailing phenomena, and improving the accuracy of optical field distribution.

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Abstract

The application relates to a space-time pulse shaping method based on a cascade 4f system. The method adopts a space-time pulse shaping device based on a cascade 4f system, and the method comprises the following steps: setting an incident pulse light beam, separating different frequency components of the incident pulse light beam to different spatial positions through a first diffraction grating, then the pulse enters a plurality of cascaded 4f systems, the 4f systems perform phase modulation on the pulse, and finally the different frequency components of the pulse output by the last 4f system are combined through a second diffraction grating to complete pulse shaping. Compared with the prior art, the application has the advantages of completing an arbitrary y-t domain space-time light pulse shaping task and the like.
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