Femtosecond optical Kerr gate based on flat-topped switching light and implementation method of femtosecond optical Kerr gate

Abstract

The femtosecond optical Kerr gate aims to solve the problems that in an existing femtosecond optical Kerr gate, switching light easily generates a self-focusing effect in an optical Kerr medium, so that the switching light only effectively opens the optical Kerr gate near the center position of a light beam, the gating efficiency is reduced, and the ultrafast measurement technology based on the optical Kerr gate is seriously restricted. The invention provides the femtosecond optical Kerr gate based on the flat-topped switch light and the implementation method of the femtosecond optical Kerr gate. According to the optical Kerr gate, Gaussian switching light in a traditional optical Kerr gate is regulated and controlled into a flat-topped light beam with flat and uniform intensity distribution through a light beam flat-topped shaper, and an optical Kerr medium is regulated and controlled to be located at a proper out-of-focus position of a convex lens, so that when the flat-topped switching light is focused and enters the optical Kerr medium, under the condition that enough power density is ensured, the optical Kerr gate is enabled to be stable and reliable. The flat-topped characteristic of the switch light is reserved to the maximum extent, so that the switch light can effectively open the optical Kerr gate in the whole irradiation area, and the gating efficiency of the optical Kerr gate is improved.

Description

Technical field [0001] The present invention belongs to the field of ultra-fast imaging and measurement, and in particular, the present invention relates to a femtosekine-based kettler gate and its implementation method based on a flat-top-based switching. Background technique [0002] In recent years, ultra-fast measurement techniques based on ultra-fast single photon detection have a wide range of applications in quantum information technology, high sensitivity testing, remote sensing and biological lighting measurements, and have become one of the current most active frontiers. The femtosekine has the characteristics of femtosecond time resolution, high signal-to-noise ratio, and does not require phase matching, which has strong flexibility in broadband luminescence, is one of the powerful tools of ultra-fast single photon detection. Flying second pulse induces electronic cloud distortion, molecular orientation, electrical telescopic, and can cause the transient birefringence ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the switching light in the existing femtosecond optical Kerr gate is prone to self-focusing effect in the optical Kerr medium, causing the switching light to effectively open the optical Kerr gate only near the center of the beam, and the gating efficiency decreases , which seriously restricts the problem of ultrafast measurement technology based on optical Kerr gate, and provides a femtosecond optical Kerr gate based on flattened switching light and its realization method

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