A Method for Improving the Generation Efficiency of Third Harmonic in Optical Fiber

A sub-harmonic and optical fiber technology, applied in the field of short-wavelength ultra-short pulse laser generation, can solve the problem of short interaction length and achieve the effect of improving efficiency

Active Publication Date: 2019-12-20
JILIN UNIV
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Problems solved by technology

However, since the wavelength of the soliton is continuously red-shifted with the pump power, this results in a shorter interaction length between the soliton and the third harmonic, and the efficiency of the third harmonic generation is proportional to the square term of the pump power and the square of the interaction length is proportional to the term, therefore, how to increase the interaction distance between the soliton and the phase-matched third harmonic is the key to obtain a high-efficiency third harmonic

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  • A Method for Improving the Generation Efficiency of Third Harmonic in Optical Fiber

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Embodiment 1

[0029] Enhancement of phase-matched third harmonic conversion efficiency by soliton self-frequency shift cancellation effect in fluorotellurite microstructured fibers.

[0030] First, the fluorotellurate microstructured optical fiber was prepared by the rod-tube method. The cross-section of the microstructured optical fiber 1 is as follows: figure 1 As shown, the core is surrounded by six petal-shaped air holes, and the cladding is outside, and the materials of the core and cladding are 70TeO 2 -20BaF 2 -10Y 2 o 3 and 65TeO 2 -25BaF 2 -10Y 2 o 3 , the size of the air hole can be adjusted by controlling the air pressure of the ventilation device of the fiber drawing tower. The refractive index profiles of the core and cladding and the calculated material dispersion as figure 2 and image 3 shown. Figure 4 The black solid line and the black dotted line are the group velocity dispersion curve and β of the fundamental mode in the fiber, respectively 1 parameter. It c...

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Abstract

The invention provides a new method for improving generation efficiency of a third harmonic in optical fibers. The method comprises the steps that a designed fluorine tellurite microstructure opticalfiber with double zero dispersion wavelengths is used as a medium of the third harmonic, femtosecond laser of 1560 nm is used as pump laser, soliton self-frequency shift occurs in the microstructure optical fiber, when the soliton wavelengths sweep a point at which a basic-order mode phase is matched with a high-order mode phase, and the third harmonic of which the wavelengths are 527 nm, 544 nm,580 nm and 629 nm occurs and is enhanced in sequence. When a soliton self-frequency shift offset effect happens, the third harmonic (the wavelength is 629 nm) which a soliton is matched with grows fastest, and the conversion efficiency of the third harmonic is obviously improved and can reach 0.92 %.

Description

technical field [0001] The invention belongs to the technical field of short-wavelength ultrashort pulse laser generation, and in particular relates to a method for improving the third harmonic generation efficiency in an optical fiber. Background technique [0002] Third harmonic generation is a typical nonlinear optical effect, which refers to the process in which light with a frequency of ω enters the medium to generate light with a frequency of 3ω. Using the third harmonic to generate light sources with shorter wavelengths (visible and even deep ultraviolet) can be used in biomedicine, microscopic imaging, display and other fields. In recent years, researchers have tried to use third harmonic generation to obtain all-fiber short-wavelength ultrashort pulse laser. [0003] At present, the method for generating the third harmonic in the optical fiber is as follows: inject a beam of pulsed laser into a section of highly nonlinear optical fiber, when the wavelength of the p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02F1/365
Inventor 秦冠仕姚传飞贾志旭李卿秦伟平
Owner JILIN UNIV
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