Method and device for generating broadband continuously tunable coherent extreme ultraviolet source

Abstract

The invention discloses a method and a device for generating a broadband continuously tunable coherent extreme ultraviolet source. The method comprises the following steps of generating a femtosecond laser beam; focusing the laser beam to working gas, wherein the laser beam and the working gas interact under a vacuum environment to generate higher harmonics; adjusting the incident energy of the laser beam or the gas pressure of the working gas so as to change the phase matching conditions of the higher harmonics to cause the red shift or the blue shift of the frequency of the higher harmonics, therefore realizing the continuous tuning of harmonic radiation wavelengths of all orders of the coherent extreme ultraviolet source. The invention also provides a method for realizing the method. By implementing the method and the device disclosed by the invention, the continuous tuning of the harmonic radiation wavelengths of all the orders of the coherent extreme ultraviolet source can be realized.

Description

technical field [0001] The present invention relates to the fields of strong-field laser physics and attosecond science and technology, and more specifically, to a method and device for generating a broadband continuously tunable coherent extreme ultraviolet light source. Background technique [0002] The wavelength of extreme ultraviolet light is in the spectral region of 10-121nm. It is a kind of high-energy electron radiation, which can cause material energy level transitions and chemical reactions that are difficult to achieve by other methods. Tunable extreme ultraviolet light source is of great significance in the research of laser spectroscopy. It is the main method to achieve high-resolution imaging. In addition, it also has great application prospects in ultra-high-density optical disks, material processing technology and biomedicine. [0003] In the existing methods, the generation of coherent light source is generally realized by the stimulated radiation of the wo...

AI Technical Summary

Problems solved by technology

The patent application number 201310188870.1 describes the method of producing extreme ultraviolet tunable monochromatic coherent light source, which involves the interaction of multicolor laser field and gas, macroscopic phase matching and intraatomic phase matching technology, but it can only tune specific harmonics The wavelength of each order, but cannot simultaneously realize the continuous tuning of the wavelength of the harmonic radiation wavelength of each order of the extreme ultraviolet light source

Therefore, the deficiencies of existing technologies restrict the practical application of tunable extreme ultraviolet light sources

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