Ultra-short pulse laser-based extreme ultraviolet light generation system with high efficiency and continuously adjustable wavelength

Abstract

The invention discloses an ultra-short pulse laser-based extreme ultraviolet light generation system with high efficiency and continuously adjustable wavelength. The method comprises the steps that fundamental frequency light output by an ultra-short pulse laser is subjected to wavelength conversion through an optical frequency multiplier or an optical parameter amplifier; and the converted pulse laser is focused on an inert gas through a higher harmonic generator to be radiated to generate higher harmonics, wavelength selection is carried out through an extreme ultraviolet monochromator, and finally high-energy and high-luminous flux monochromatic extreme ultraviolet light is output. The invention has high stability, signal to noise ratio is good, an optical frequency multiplier or an optical parameter amplifier is adopted to carry out wavelength conversion on ultra-short pulse fundamental frequency light; high-order harmonics with specific photon energy are selected from high-order harmonic spectrums through a light splitting grating, a reflector and a multi-dimensional adjusting structure, high efficiency and continuously adjustable wavelength are achieved, and generated high-energy and high-luminous-flux extreme ultraviolet light can be used for research of a time resolution and angle resolution photoelectron spectroscopy system and an extreme ultraviolet light coherent diffraction imaging system.

Description

technical field [0001] The invention relates to a high-efficiency and continuously adjustable extreme ultraviolet light generation system based on ultrashort pulse laser, and belongs to the technical fields of time-resolved and angle-resolved photoelectron spectroscopy systems and extreme ultraviolet light coherent diffraction imaging systems. Background technique [0002] The time-resolved and angle-resolved photoelectron spectroscopy system (TR-ARPES) uses the photoelectric effect to study the electronic band structure inside solid materials. The system uses femtosecond-level extreme ultraviolet pulsed light to detect the sample, and can obtain the change law of the electronic energy band of the sample within the femtosecond-level time scale, which is useful for studying the internal electronic dynamic information and research of new electronic materials. Ultra-high-speed devices provide an efficient approach. In time-resolved and angle-resolved photoelectron spectroscopy...

AI Technical Summary

Problems solved by technology

However, in these systems, high-order harmonics are usually directly excited by ultrashort-pulse fundamental-frequency lasers, and there are problems such as low luminous flux, low conversion efficiency, and difficulty in breaking through 100eV photon energy (ultraviolet light has a longer wavelength), and the incident light wavelength Unable to continuously adjust and other limitations

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