Multi-frequency pulse sequence ultrafast laser continuous spectral detection device and method
A pulse sequence, ultrafast laser technology, used in measurement devices, color/spectral property measurement, material analysis by optical means, etc. Research and production needs and other issues, to achieve the effect of reducing system cost, simplifying system and easy to implement
Inactive Publication Date: 2019-05-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0005] The purpose of the present invention is to solve the problem of low time resolution of the existing spectral detection means, the inability to perform multi-frame continuous spectral detection on the femtosecond to picosecond level process, and the difficulty in meeting the needs of scientific research and production, and propose a multi-frequency Pulse sequence ultrafast laser continuous spectrum detection device and method, the method can achieve femtosecond time resolution and can perform multi-frame continuous shooting spectrum detection
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Embodiment 1
[0036] Multi-frequency pulse sequence ultrafast laser continuous spectrum detection method: after the ultrafast laser pulse generated by the ultrafast pulse laser passes through the multi-frequency pulse sequence generator, it becomes a pulse sequence composed of multiple pulses of different frequencies in the same beam; , the pulse sequences of different frequencies are separated from space to form several pulse sub-beams, and the pulse sub-beams of each frequency are collected at the same time, and the spectrogram is obtained after computer processing.
[0037] A multi-frequency pulse sequence ultrafast laser continuous spectrum detection device includes an ultrafast pulse laser 1 , a multifrequency pulse sequence generator 2 , a pulse frequency divider 4 and a CCD camera 5 .
[0038] The multi-frequency pulse train generator 2 described multi-frequency pulse train generator comprises: the first wave splitter 6, the first time delay device 7, the first reflection mirror 8, th...
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The invention relates to detection of ultrahigh time resolving power of ultrafast process, in particular to a multi-frequency pulse sequence ultrafast laser continuous spectral detection device and method, and belongs to the field of ultrafast detection. The multi-frequency pulse sequence ultrafast laser continuous spectral detection device comprises an ultrashort pulse laser, a multi-frequency pulse sequence generator, a pulse frequency divider, and a CCD (charge coupled device) camera. The method herein is characterized in that a laser pulse is generated through the ultrashort pulse laser, multiple pulse sequences composed of different frequency pulses are generated through the multi-frequency pulse sequence generator, the different frequency pulses have certain time delay, the laser pulses of the frequencies are divided in space through the pulse frequency divider after the different frequency pulses pass through a sample, spectral detection is performed with the CCD camera, and therefore, ultrafast continuous electronic dynamic spectral information of the sample is attained. The device and method herein have the advantages that time resolution may reach femtosecond level; spectral continuous detection is achieved for different frequency bands, and complete continuous spectral measurement is carried out for a process having no repeated experimental conditions; filming periodand filming quantity are controllably adjustable.
Description
technical field [0001] The invention relates to the detection of ultra-high time resolution capability of ultra-fast processes, in particular to a multi-frequency pulse sequence ultra-fast laser continuous spectrum detection device and method, belonging to the field of ultra-fast detection. Background technique [0002] In different scientific researches and technological developments, it is often necessary to perform continuous testing of a certain process with very short 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). [0003] Traditional continuous detecti...
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IPC IPC(8): G01N21/25G01N21/01
Inventor 姜澜郭宝山孙靖雅华艳红
Owner BEIJING INSTITUTE OF TECHNOLOGYGY