Planar waveguide device and installation method for generating high-order harmonics

Abstract

The invention discloses a planar waveguide device and an installation method for generating high-order harmonics. Its core component is a planar waveguide composed of two pieces of planar glass. The gap is sealed by a gas sealing device, and the gap is filled with inert gas; after the femtosecond laser is focused, it enters the planar waveguide, propagates forward in the form of grazing incidence in the waveguide, and interacts with the inert gas to generate high-order harmonics. The invention is the first to use a planar waveguide composed of two pieces of planar glass as a gas carrier, which can not only effectively generate high-order harmonics, but also conveniently obtain a periodic structure on the planar waveguide.

Description

technical field [0001] The invention relates to the technical field of ultrafast optics, in particular to a planar waveguide device for generating high-order harmonics and an installation method thereof. Background technique [0002] Femtosecond laser driving atoms to generate higher harmonics is currently the only way to obtain desktop coherent extreme ultraviolet (EUV) light source and coherent soft X-ray (Soft-Xray) light source, and it is also the preferred method to obtain attosecond coherent pulsed light. At present, there are mainly three experimental devices for generating high-order harmonics: the first is to use the pulse jet valve as the source of high-order harmonics; the second is to use a gas box as a high-order harmonic generator; the third is A hollow capillary waveguide is used as a gas carrier to generate higher harmonics. [0003] Since the generation of high-order harmonics needs to be carried out in a vacuum environment, when the inert gas that generate...

AI Technical Summary

Problems solved by technology

On the other hand, compared with the previous two methods, the hollow capillary waveguide can effectively suppress the laser plasma defocusing, significantly increase the interaction length between the laser and the gas, and greatly increase the intensity of the generated signal, but the higher harmonics generated by it The wavelength is longer, which cannot further meet people's application needs; and a large number of experiments have proved that the hollow capillary with a periodic change in inner diameter can more effectively generate short-wavelength high-order harmonics, so that the output of short-wavelength high-order harmonics can reach Applicable level

[0004] However, at present, the manufacture of hollow capillaries with periodically changing inner diameters requires the use of glass-blowing technology, which is an extremely sophisticated and complex technology, so this adds great difficulty to obtaining hollow capillaries with this special structure.

Although femtosecond laser micromachining technology can also be used to obtain periodically changing structures on the glass surface, it is almost impossible to use femtosecond lasers to etch periodically changing structures on the walls of hollow capillaries because the walls of hollow capillaries are curved. accomplish

Images