Optical fiber structure used for converting adjustable wavelength

Abstract

The invention provides an optical fiber structure used for converting the adjustable wavelength. The optical fiber structure comprises a covering layer, a first fiber core and a second fiber core are located in the covering layer, the space between the inner side of the covering layer and the first fiber core and the second fiber core is filled with silicon dioxide, the first fiber core comprises an inner-layer fiber core, a middle-layer fiber core and an outer-layer fiber core, the inner-layer fiber core, the middle-layer fiber core and the outer-layer fiber core are all filled with doped silicon dioxide, the second fiber core comprises a lining fiber core and a surface layer fiber core, both the lining fiber core and the surface layer fiber core are filled with doped silicon dioxide, the volume percentages of doped silicon dioxide in the inner-layer fiber core, the outer-layer fiber core and the middle-layer fiber corer are gradually reduced in sequence, the volume percentage of doped silicon dioxide in the inner-layer fiber core is smaller than that of doped silicon dioxide in surface layer fiber core, pump light is introduced into the first fiber core, and high-frequency pulse light is introduced into the second fiber core. According to the optical fiber structure used for converting the adjustable wavelength, the high-frequency pulse light is utilized to control three times of harmonic processes of optical fiber, and thus the light is large in bandwidth, variable in wavelength, and flexible in practical application based on the three times of harmonic processes of the optical fiber.

Description

technical field [0001] The invention relates to the technical field of third harmonic phase matching in optical fibers, in particular to an optical fiber structure for adjustable wavelength conversion. Background technique [0002] Since the birth of lasers, the nonlinear harmonic effect has been a key research topic and has received extensive attention. Using this effect, more new band laser spectral lines can be obtained, and the existing lasers can be extended to the spectral line range with shorter wavelengths. [0003] Among them, the third harmonic effect in optical fiber has received extensive attention because of its elusive quantum effect. The third harmonic can be used to generate short-wavelength light, such as ultraviolet light, which is generated by fundamental frequency light using the high-order harmonic effect. Lasers of new wavelengths. Since the power of the third harmonic is a cubic function of the incident pump power, this cubic relationship helps to ut...

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Problems solved by technology

[0004] In the process of achieving efficient third harmonics, although researchers have found a large number of phase matching methods to achieve third harmonics, there are still defects. For each third harmonic process, the wavelength of pump light and The wavelength of the third harmonic light is fixed, and the practical application is not flexible

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