Multi-frequency pulse ultrafast laser continuous imaging device and method based on super-continuum spectrum

Abstract

The invention relates to a multi-frequency pulse ultrafast laser continuous imaging device and method based on a super-continuum spectrum, and belongs to the field of ultrafast imaging. The device comprises an ultra-short pulse laser, a multi-frequency pulse generator, a pulse frequency divider and a CCD camera. The method comprises the steps: generating laser pulses through an ultra-short pulse laser; generating the super-continuum spectrum through the multi-frequency pulse generator, wherein there is a certain time delay between different frequencies; separating the laser pulses of all the frequencies in space through a pulse frequency divider after passing through a sample, and performing the detection through a CCD camera, thereby obtaining super-fast continuous electronic dynamic image information of the sample. The device and the method can enable the time resolution to reach the femtosecond magnitude, achieve the continuous shooting, and achieve the complete shooting of the process without repeated experiment conditions, wherein the shooting period and the shooting number can be controlled and adjusted. Moreover, the total number of shooting frames is greatly increased and can reach more than 100 compared with an existing ultrafast imaging system.

Description

technical field [0001] The invention relates to a supercontinuum-based multi-frequency pulse ultrafast laser continuous imaging device and method, belonging to the field of ultrafast imaging. Background technique [0002] In different scientific researches and process technology research and development, it is often necessary to take continuous pictures of a certain process with very small time intervals. For example, the absorption and transfer of photon energy by materials in the ultrafast laser manufacturing process, electron excitation and other processes directly affect and determine the subsequent processing process, including the quality and precision of the manufacturing results, so the observation of this process is very important. However, the duration of this process is short and the change is fast, on the order of femtoseconds (10 -15 s). Ultrafast continuous imaging observations on this time scale are of great significance to science and production. [0003] ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that the existing imaging detection means have low time resolution, cannot perform multi-frame continuous imaging on the process of femtosecond to picosecond interval, and it is difficult to meet the needs of scientific research and production. Spectral multi-frequency pulse ultrafast laser continuous imaging device and method, the method can achieve femtosecond time resolution and can perform continuous imaging with multiple frames

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