Femtosecond heterodyne optical Kerr gate and imaging device and method based on optical Kerr gate

Abstract

The invention provides a femtosecond heterodyne optical Kerr gate and an imaging device and method based on the optical Kerr gate. A target to be detected, the femtosecond heterodyne optical Kerr gate and a CCD are sequentially arranged on a detection light path of the imaging device, wherein the femtosecond heterodyne optical Kerr gate is composed of a polarizer, an optical Kerr medium and an analyzer, and the heterodyne angle between the polarization direction of the analyzer and the polarization perpendicular direction of a detection pulse ranges from 3 degrees to 5 degrees. An optical delay line and a half wave plate are sequentially arranged on a switch light path, and a switching pulse and the detection pulse coincide inside the Kerr medium. The imaging method includes the steps of dividing a femtosecond pulse into two paths, enabling the detection pulse to enter a sample to be detected and enter the femtosecond heterodyne optical Kerr gate after being reflected and transmitted, opening the femtosecond heterodyne optical Kerr gate through the switching pulse, instantly gating components carrying sample morphology information in the detection pulse, enabling the gated detection pulse to enter the CCD, and obtaining a morphology image of the sample to be detected, wherein the morphology image has ultrahigh time resolution. The femtosecond heterodyne optical Kerr gate and the imaging device and method have the advantages of being simple in light path and extremely short in gating time, enabling the imaging space resolution to be close to the system diffraction limit, and the like.

Description

technical field [0001] The invention belongs to the technical field of ultra-fast imaging and measurement, and relates to a femtosecond heterodyne optical Kerr gate and an imaging device and method based on the optical Kerr gate. Background technique [0002] The development of ultra-fast imaging and measurement technology has important application value in the research fields of high-speed collision, detonation process, high-voltage discharge, visual mechanism and other transient processes. Generally, high time-resolved imaging from milliseconds to sub-picoseconds can be achieved by using photoelectric technology. Using ultra-fast imaging technology based on photonic technology, such as femtosecond holographic imaging and nonlinear optical gate imaging technology. [0003] Optical Kerr gate imaging technology is a typical nonlinear optical gate imaging technology. This imaging technology uses the optical shutter constructed by the optical Kerr effect, which is usually cal...

AI Technical Summary

Problems solved by technology

However, this low-pass filtering effect also leads to blurred image edges in traditional optical Kerr gate imaging technology, which affects its imaging quality and even greatly reduces its system imaging resolution.

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