Development of a broadband mid-infrared source for remote sensing

Diode-pumped setup allows a compact/low-cost building. Credit: National Institute for Fusion Science

A research study group of the National Institutes of Natural Sciences, National Institute for Fusion Science and Akita Prefectural University has actually effectively shown a broadband mid-infrared (MIR) source with a easy setup. This light source creates highly-stable broadband MIR beam at 2.5-3.7 μm wavelength variety preserving the brightness owing to its high-beam quality. Such a broadband MIR source helps with a streamlined ecological tracking system by building a MIR fiber-optic sensing unit, which has the prospective for commercial and medical applications.

In the MIR wavelength area, there are numerous strong absorption lines of particles due to the modification of their rotational and vibrational states. Therefore, by utilizing MIR sources, we have appealing chances to establish delicate remote tracking systems of useful usage. In specific, a fiber-optic sensing unit based upon MIR absorption spectroscopy has excellent prospective as the next-generation gas discovering gadget, e.g., for an exhaust gas screen at a plant, breath analysis for medical functions, and other usages. However, there is the staying concern of the lack of a ideal MIR source displaying broadband spectrum and high-beam quality. In this work, the research study group has actually shown an ultra-broadband magnified spontaneous emission (ASE) source at the MIR area, which satisfies the requirements for establishing the fiber-optic sensing unit.

In order to acquire the MIR emission, the research study group has actually established fiber optics made of fluoride glass co-doped with trivalent ions of Er (the atomic number 68) and Dy (66). This fiber allows a easy and low-priced setup of ASE light source with diode-pumping (Fig. 1) by ways of energy transfer from Er^3+ to Dy^3+. A broadband and moderate-power ASE light source of 2.5-3.7 μm wavelength (Fig. 2) was experimentally examined for the maximum style of fluoride fiber in terms of ion concentration, fiber length, pumping setup, and pumping power. In addition, this light source displays exceptional beam quality leading to high-coupling performance with an external fiber optics.

Development of a broadband mid-infrared source for remote sensing
Absorption wavelengths of the normal gas particles are marked at the bottom. Credit: National Institute for Fusion Science

Assistant Professor Hiyori Uehara states, “Our new light source can facilitate a simplified MIR fiber-optic sensor device for various practical applications. For example, an environmental monitoring system in the industrial plant, stand-off detection of hazardous objects, disease diagnosis by breath analysis, inspection of fiber-optic devices, and others. Ongoing detailed research demonstrating highly-sensitive multiple-gas detection using a MIR fiber sensor will be performed and reported in the near future.”

Polymer-based fiber optics for visualization of product tension

More info:
Kenji Goya et al, Broadband mid-infrared magnified spontaneous emission from Er/Dy co-doped fluoride fiber with a easy diode-pumped setup, Scientific Reports (2021). DOI: 10.1038/s41598-021-84950-y

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National Institutes of Natural Sciences

Development of a broadband mid-infrared source for remote sensing (2021, March 31)
recovered 31 March 2021

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