Femtosecond optical Kerr gate gated imaging device and method based on directional filtering

Abstract

The invention provides a femtosecond optical Kerr gate gated imaging device and method based on directional filtering. Light paths of the imaging device are divided into a detecting light path and a pumping light path. An object to be measured, a first convex lens, an optical Kerr gate composed of a polarizer, optical Kerr mediums and an analyzer, a second convex lens and a CCD are sequentially arranged on the detecting light path. The requirements of a 4f system are met. An optics delay line, a half wave plate and a space shaping device are sequentially arranged on the pumping light path. The imaging method includes the steps that femtosecond pulse lasers are changed into two beams through a beam splitter, and femtosecond detection pulse light passes the object to be detected and then is focused and enters the optical Kerr mediums in an incident mode; after femtosecond pumping pulse light opens the optical Kerr gate, components of information, carried in the femtosecond detection pulse light, of the object to be detected are instantly gated, finally, the components of the information reach the CCD, and a high-contrast-ratio image of the object to be detected is obtained. The femtosecond optical Kerr gate gated imaging device and method based on directional filtering have the advantages that cost is low, the light paths are simple and convenient to adjust, and optical Kerr gate gating and recognition of a characteristic structure of the object to be detected can be achieved at the same time.

Description

technical field [0001] The invention belongs to the technical field of ultrafast imaging and measurement, in particular to a femtosecond optical Kerr gate imaging device and method based on direction filtering. Background technique [0002] The development of ultra-fast imaging and measurement technology has very important application value for the study of transient processes such as high-speed collisions, explosion processes, and high-voltage discharges. Traditional optoelectronic technology is difficult to detect these ultrafast processes. Ultrafast imaging and measurement technology based on femtosecond laser can achieve femtosecond time resolution, so it has very important development prospects and significance. [0003] The optical Kerr gate is an all-optical switch based on the optical Kerr effect, which has the advantages of femtosecond-level time resolution, convenient operation, and high photon gating efficiency. Imaging technology based on optical Kernel gate-gat...

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However, conventional directional filtering techniq...

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