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
CN110579922AActive Publication Date: 2019-12-17HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2019-12-17

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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.
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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...

Claims

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