Device and method for measuring phase velocity of ultrashort pulse laser propagating in medium

Abstract

A device for measuring the propagation phase velocity of an ultrashort pulse laser in media comprises an ultrashort pulse laser source, two beam splitters, six reflectors, the transparent media to be measured, a precision optical delay platform system, two precision detectors and a computer. According to a method for measuring the propagation phase velocity of the ultrashort pulse laser in the media, the ultrashort pulse laser output by the ultrashort pulse laser source is divided into two routes of lasers through the beam splitters, the pump laser and the detection laser are recombined through the beam splitters to obtain a composite output laser, and due to the fact that the precision optical delay platform system and the precision detectors are combined for use, the phase speed of the ultrashort pulse laser in the transparent media to be measured can be accurately and rapidly measured. The method is simple, the device is reasonable in configuration, and external influence can be eliminated through the simple operational method in contrastive analysis as influence on a measuring curve and a background curve from external factors is consistent. Therefore, the device and method have higher measuring accuracy and can be more suitable for the wider work environment.

Description

technical field [0001] The present invention relates to ultrashort pulse laser performance parameter measurement technology, more specifically, relates to a device for measuring ultrashort pulse laser propagation phase velocity in a transparent medium and a measurement method thereof. Background technique [0002] Since Maiman developed the world's first ruby ​​laser in 1960, due to the incomparable advantages of this new type of light source in terms of monochromaticity, directionality, coherence and power density, various new types of lasers have been continuously developed. Come out and be widely used in various fields of life, since then laser has been closely related to human's daily life. One of the main development directions of laser technology is that the pulse width is getting narrower and narrower. In the mid-1980s, the rapid development of ultrashort pulse laser technology made the laser pulse width enter from picosecond level to femtosecond level. Since ultrash...

AI Technical Summary

Problems solved by technology

However, the existing technology often calculates the phase velocity indirectly by measuring the refractive index of the medium, and cannot directly measure the propagation phase velocity of the ultrashort pulse laser, which makes the measurement process complicated and the measurement results inaccurate. These technical problems need to be solved

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