Device and method for generating ultraviolet super-continuum spectrum light source based on sub-wavelength optical fiber

A supercontinuum light source and supercontinuum technology, applied in the direction of the structure/shape of the active medium, can solve problems such as research gaps, and achieve the effects of high output power, strong light field confinement, and high nonlinear effects

Pending Publication Date: 2022-07-08
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the generation of supercontinuum, there is no supercontinuum in the ultraviolet band below 400nm, and there is a research gap

Method used

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  • Device and method for generating ultraviolet super-continuum spectrum light source based on sub-wavelength optical fiber
  • Device and method for generating ultraviolet super-continuum spectrum light source based on sub-wavelength optical fiber
  • Device and method for generating ultraviolet super-continuum spectrum light source based on sub-wavelength optical fiber

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Embodiment 1

[0028] like figure 1 As shown, the present embodiment provides a device for generating an ultraviolet supercontinuum light source based on a subwavelength fiber. The pump light source, the first fiber coupler, the subwavelength fiber, the second fiber coupler and the spectrometer.

[0029] The output end of the pump light source is connected to the input end of the first fiber coupler, and the output end of the first fiber coupler is connected to the subwavelength fiber. The laser beam is coupled into the subwavelength fiber through a first fiber coupler. The spectrum is broadened under the action of fiber nonlinearity and dispersion, resulting in a broad and flat supercontinuum that can be extended to the ultraviolet band. The output end of the subwavelength fiber is connected to the input end of the second fiber coupler, and the output end of the second fiber coupler is connected to the spectrometer. The supercontinuum is input to the spectrum analyzer through the second ...

Embodiment 2

[0040] This embodiment provides a method for generating an ultraviolet supercontinuum light source based on a subwavelength optical fiber, including:

[0041]Through the pump light source, a non-chirped hyperbolic secant optical pulse with a central wavelength of 400 nm, an initial pulse width of 250-450 fs, and a pulse peak power of kilowatts is emitted;

[0042] The optical pulse enters the subwavelength fiber through the first fiber coupler to perform dispersion and nonlinear effects, and the subwavelength fiber outputs the ultraviolet supercontinuum spectrum.

[0043] Using the method described in this embodiment, the obtained ultraviolet supercontinuum has a range of 245 nm to 1114 nm, the output flatness is 0.968, and the average output power is -44.02 dB.

[0044] The invention can obtain the supercontinuum spectrum broadened to deep ultraviolet, the range of the supercontinuum spectrum of the outer supercontinuum spectrum is 245nm-1114nm, and has a relatively flat disp...

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Abstract

The invention discloses a device for generating an ultraviolet super-continuum spectrum light source based on a sub-wavelength optical fiber. The device comprises a pump light source, a first optical fiber coupler and the sub-wavelength optical fiber which are sequentially arranged on the same light path, and the sub-wavelength optical fiber outputs an ultraviolet super-continuum spectrum. The invention discloses a method for generating an ultraviolet super-continuum spectrum light source based on a sub-wavelength optical fiber. The method comprises the following steps: emitting a chirp-free hyperbolic secant light pulse with the central wavelength of 400nm, the initial pulse width range of 250-450fs and the pulse peak power of kilowatt level through a pump light source; an optical pulse enters the sub-wavelength optical fiber through the first optical fiber coupler to carry out dispersion and nonlinear effects, and the sub-wavelength optical fiber outputs an ultraviolet super-continuum spectrum. According to the invention, an ultraviolet super-continuum light source can be generated, and the technical problem that the super-continuum spectrum is difficult to expand to a short wave band is solved.

Description

technical field [0001] The invention relates to a device and a method for generating an ultraviolet supercontinuum light source based on a subwavelength optical fiber, belonging to the technical field of nonlinear optics and fiber lasers. Background technique [0002] Supercontinuum light sources have the characteristics of broad spectrum, high brightness and high coherence, and are widely used in metrology, biomedical imaging and astronomy. Ultraviolet supercontinuum covers short wavelength bands, and its spectrum has biological effects, fluorescence effects, photochemical and photoelectric effects, and plays an important role in many aspects. [0003] In the generation of supercontinuum, it is difficult to use ordinary photonic crystal fibers to generate short wavelengths below 400 nm. Fiber structure, fiber material and pumping conditions will affect the dispersion characteristics and nonlinear effects of the fiber, and the fiber structure type will affect the dispersion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067
CPCH01S3/06725H01S3/06716
Inventor 施伟华顾钰颖张甜甜
Owner NANJING UNIV OF POSTS & TELECOMM
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