An all-fiber broadband flat mid-infrared supercontinuum light source

Abstract

The invention discloses an all-optical fiber broadband flat intermediate-infrared super-continuum spectrum light source. The light source is characterized in that the light source comprises a thulium-doped mode-locked fiber laser module used for generating ultra-short pulses, a thulium-doped fiber amplification module used for generating high-power and high-order soliton pulses, a 2-3 micron high-power SC spectrum generation module used for generating 2-3 micron high-power SC spectrum laser, a silica fiber and chalcogenide fiber efficiently-coupled and encapsulated module and a 2-5 micron intermediate-infrared broadband flat SC spectrum generation module for generating a 10dB-bandwidth coverage 2-5 micron intermediate-infrared band broadband flat SC spectrum, wherein the thulium-doped mode-locked fiber laser module, the thulium-doped fiber amplification module, the 2-3 micron high-power SC spectrum generation module, the silica fiber and chalcogenide fiber efficiently-coupled and encapsulated module and the 2-5 micron intermediate-infrared broadband flat SC spectrum generation module are arranged sequentially. According to the light source, quartz optical fiber tapering and lens optical fibers are used in a matched manner, so that efficient coupling of quartz optical fibers and chalcogenide optical fibers can be realized, and pumping efficiency can be improved, the high-quality full-optical fiber broadband flat intermediate-infrared SC (super-continuum spectrum) light source can be realized; since the light source is of a full-optical fiber structure, the intermediate-infrared SC spectrum light source has the advantages of low cost, high conversion efficiency, high-quality output beams and simple and compact structure.

Description

Technical field [0001] The invention relates to the technical field of laser optoelectronics, in particular to an all-fiber-based broadband flat mid-infrared supercontinuum light source. Background technique [0002] The mid-infrared band is located in the atmospheric transmission window, covering many important molecular characteristic spectral lines. A large number of molecules experience strong characteristic vibration transitions in this band, making mid-infrared spectroscopy the only means to identify and quantify molecular species under certain conditions. The mid-infrared optical frequency comb with wide spectrum, narrow line width and high (intensity) uniformity can significantly improve the accuracy, sensitivity, recording time and spectral bandwidth of molecular detection. The mid-infrared optical frequency comb can be generated by means of difference frequency, optical parametric oscillator, microresonator or supercontinuum (SC spectrum). Since the SC spectrum has the...

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Problems solved by technology

Although many research institutions at home and abroad have done a lot of work on the generation of mid-infrared SC spectra in chalcogenide optical fibers, it is still difficult to balance the bandwidth and flatness of SC spectra at the same time, and the limitations of pump source selection make it difficult for the entire light source to achieve all-fiber The disadvantages such as chemicalization have greatly restricted the practical application of mid-infrared SC spectrum light sources.

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