Adjustment and control device and method for ultra intense and ultra short laser pulse super-continuum spectrum

Abstract

The invention discloses an adjustment and control device and method for an ultra intense and ultra short laser pulse super-continuum spectrum. After passing through a variable attenuation sheet and a time delay line, a beam of laser G (t) irradiates to a concave mirror in parallel with another beam of laser G (f) passing through a movable reflector; and G (t) and G (f) are reflected through the concave mirror and then crossed and focused. In a plasma channel produced by laser filamentation, a space plasma grating is formed because of double light beam interference; the super-continuum spectrum produced during the filamentation can be enhanced by using the plasma grating; and control and transfer of the energy of the super-continuum spectrum between the two beams of laser can be realized. According to the method and the device provided by the invention, the spectrum of the ultra short pulse can be actively controlled in an ultra intense laser field; and an involved light path has a simple structure and is convenient for adjustment.

Description

technical field [0001] The invention relates to the transmission and spectrum broadening of ultra-intensive and ultra-short laser pulses, in particular to an ultra-intensive and ultra-short laser pulse supercontinuum control device and a control method thereof. Background technique [0002] When the ultra-intense and ultra-short laser pulse is transmitted in the medium, if the pulse energy is high enough, it will cause the laser filamentation effect, form a plasma channel and generate a supercontinuum. Ultra-intense and ultra-short laser pulses form filaments in the state of free transmission, which is conducive to the relatively stable transmission of laser energy over a long distance, so the phenomenon of laser filamentation has been widely concerned by people. The supercontinuum associated with the laser filamentation process also has great potential application value. [0003] Since Alfano and Shapiro observed the supercontinuum in experiments in 1970, people have been ...

AI Technical Summary

Problems solved by technology

However, the above-mentioned prior art can only enhance the supercontinuum produced by laser filamentation to a certain extent, and it must be realized by changing the output pulse properties of the laser source.

This is obviously far from meeting the needs of various applications, and more and more effective control methods for laser filamentation supercontinuum are urgently needed

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