Super-continuum spectrum generation device and super-continuum spectrum generation method

Abstract

The invention relates to a super-continuum spectrum generation device and a super-continuum spectrum generation method. The super-continuum spectrum generation device comprises a femtosecond laser, areflector, a half-wave plate, a polarizing film, a focusing lens, a dielectric slice resonant cavity and a collimating lens which are arranged in sequence, wherein the dielectric slice resonant cavityconsists of a plurality of dielectric slices which are arranged at equal cavity length. The super-continuum spectrum generation method comprises the steps of setting and acquiring preset parameters,calculating to obtain an effective light spot radius on a dielectric slice, acquiring a space self-similarity mode curve, calculating to obtain the cavity length of the dielectric slice resonant cavity, generating a super-continuum spectrum and optimizing the super-continuum spectrum. Compared with the prior art, the physical parameters of a resonance system are derived through the parameters of the laser, and uncertainty caused by manual placement of dielectric slices is avoided, thereby guaranteeing that super-continuous output high in energy conversion efficiency and excellent in space self-similarity mode is obtained; and the space occupied by the fiber is smaller than that of an inflatable hollow fiber, and the super-continuum spectrum generation device is suitable for incident laserswith different laser powers, pulse energies and wavelengths.

Description

technical field [0001] The invention relates to the technical fields of ultrafast optics and nonlinear optics, in particular to a supercontinuum generating device and a supercontinuum generating method. Background technique [0002] Supercontinuum light sources have very important applications in the research of ultrafast optics and nonlinear optics. Supercontinuum light sources can cover a broad spectral range and are important tools for studying ultrafast spectroscopy of gases, liquids, and solid materials. At the same time, the supercontinuum light source is widely used as a seed light source in laser products such as optical parametric amplifiers. After regeneration and amplification, it can generate laser radiation with adjustable wavelength according to needs. On the other hand, through the phase correction of the supercontinuum light source, the laser pulse can be compressed into an ultrashort pulse in time, thereby generating an extremely strong optical field intens...

AI Technical Summary

Problems solved by technology

The disadvantages of using an air-filled hollow fiber supercontinuum generation device are: 1) The installation and operation are complicated, and special training personnel are required for maintenance; 2) The coupling stability of the laser and the fiber is poor, resulting in instability in parameters such as output intensity, phase, and spectral width. ;3) The fiber optic system has a limited lifetime and is easily damaged by high-energy laser pulses

At the same time, because the existing method does not make the system close to the nonlinear resonance state and reach the appropriate operating parameters, the cone scattering effect in the propagation process greatly destroys the lateral spatial self-similarity mode of the spot

Therefore, it is necessary to achieve high-quality laser propagation mode through spatial filtering, and the filtering efficiency is usually only about 60%

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