Device and method for producing high-order harmonic super-continuum spectrum

Abstract

The invention provides a device for producing a high-order harmonic super-continuum spectrum. The device comprises a femtosecond laser device, an optical parametric amplifier, a convergence lens, a vacuum cavity, an incidence window, a gas box, an extreme ultraviolet spectrograph and an extreme ultraviolet camera lens, wherein the optical parametric amplifier is used for converting femtosecond laser into tunable infrared laser with the wavelength being 1.6-2.2 micrometers; laser beams emitted by the femtosecond laser device are converted into infrared laser with the tunable wavelength through the optical parametric amplifier, the infrared laser is focused through the convergence lens and then interacts with inert gases in the gas box in the vacuum cavity after penetrating through the incidence window, and the high-order harmonic super-continuum spectrum is produced. According to the device, the single-path laser of a doublet spectrum structure is utilized, a periodic order is not needed, the inert gases can be driven to produce the high-order harmonic super-continuum spectrum, and outputting of the high-order harmonic super-continuum spectrum is optimized by driving tuning of laser chirping. Meanwhile, the invention provides a method for producing the high-order harmonic super-continuum spectrum.

Description

technical field [0001] The invention relates to the generation of extreme ultraviolet-soft X-ray supercontinuum, especially the high-order harmonic supercontinuum based on the interaction between laser and gas, and specifically relates to a device and method for generating high-order harmonic supercontinuum . Background technique [0002] High-order harmonic supercontinuum is mainly used for the generation of ultrashort attosecond pulses and the detection of extreme ultraviolet-soft X-rays of materials. At present, there are mainly two types of methods for generating high-order harmonic supercontinuum. One is to use period-level ultrashort femtosecond laser pulses to interact with gas, and the period-level ultrashort femtosecond laser pulses involved are Only a few femtoseconds (including only one or two photoperiods), this kind of ultrashort pulse is extremely difficult to generate and its performance is unstable; the other is to use a two-color laser field or a double-pul...

AI Technical Summary

Problems solved by technology

At present, there are mainly two types of methods for generating high-order harmonic supercontinuum. One is to use period-level ultrashort femtosecond laser pulses to interact with gas, and the period-level ultrashort femtosecond laser pulses involved are Only a few femtoseconds (including only one or two photoperiods), this kind of ultrashort pulse is extremely difficult to generate and has unstable performance; the other is to use a two-color laser field or a double-pulse time gate to achieve high-order harmonic supercontinuum The generation of this method involves the optical field superposition and delay tuning of two or more lasers, and both the scheme and the operation are more complicated

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