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Mid-infrared light radiation generation system and method based on difference frequency generation process

An infrared light and signal light technology, applied in optics, nonlinear optics, instruments, etc., can solve the problem of inability to directly obtain high instantaneous bandwidth mid-infrared light radiation, and achieve the effects of easy practicality, easy miniaturization, and simple structure

Active Publication Date: 2019-12-17
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a mid-infrared light radiation generation system and method based on the difference frequency generation process, aiming at solving the inability to directly obtain a single nonlinear crystal in the prior art The problem of mid-infrared light radiation with high instantaneous bandwidth

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  • Mid-infrared light radiation generation system and method based on difference frequency generation process
  • Mid-infrared light radiation generation system and method based on difference frequency generation process
  • Mid-infrared light radiation generation system and method based on difference frequency generation process

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Embodiment 1

[0042] The mid-infrared light radiation generation system based on the difference frequency generation process provided in this embodiment is as follows: figure 2 As shown, it includes: a pump light signal light generation module and a nonlinear medium module; wherein the pump light signal light generation module includes an erbium-doped mode-locked oscillator 11, a fiber coupler 12, a first erbium-doped fiber amplifier 13, and a negative dispersion High nonlinear fiber 14, second ytterbium-doped fiber amplifier 15, aspheric mirror 16, wave plate 17, isolator 18, grating pair 19, telescope system 110, erbium-doped fiber amplifier 111, positive dispersion high nonlinear fiber 112, aspheric mirror 113, time delay line 114, telescope system 115.

[0043] Specifically, the pulse with a center wavelength of 1560 nm emitted by the erbium-doped fiber oscillator 11 serves as a seed source for the entire system. The seed source is divided into two paths by the fiber coupler 12, and t...

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Abstract

The invention discloses a mid-infrared light radiation generation system and method based on a difference frequency generation process. The mid-infrared light radiation generation system comprises a pump light signal light generation module and a nonlinear medium module, and the non-linear medium module obtains bandwidth-broadened mid-infrared light radiation based on the difference frequency generation process and a superposition effect of different frequency bands of idler frequency light generated by signal light and pump light in non-linear crystals of different polarization periods. According to the invention, two or more cascaded second-order nonlinear crystals with different phase matching central wavelengths are adopted, the bandwidth of the generated mid-infrared light radiation can reach the sum of the phase matching bandwidths of all the second-order nonlinear crystals, the instantaneous bandwidth is wide, and the mid-infrared light radiation with high instantaneous bandwidth can be directly obtained without tuning. In addition, the mid-infrared light radiation generation system is simple in structure, free of a resonant cavity, low in design cost and easy to be mini andpractical.

Description

technical field [0001] The invention belongs to the field of mid-infrared light radiation, and more specifically relates to a system and method for generating mid-infrared light radiation based on a difference frequency generation process. Background technique [0002] Generally, the spectral region from 2 microns to 20 microns is called the mid-infrared spectral region. Because a large number of chemical molecules have absorption peaks in the mid-infrared region, the mid-infrared region is also called the molecular fingerprint region. Mid-infrared light sources are widely used in gas detection, biomedicine, non-contact detection of dangerous goods, national defense and safety, etc. The way to obtain mid-infrared light sources is a hot research topic now. Common methods include quantum cascade lasers, optical parametric oscillators, difference frequency generation, and so on. However, the mid-infrared light source generated by the quantum cascade laser has a narrow bandwid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/39
CPCG02F1/353G02F1/3544G02F1/39
Inventor 张兆伟冯玺
Owner HUAZHONG UNIV OF SCI & TECH
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