August 2020
Spotlight Summary by Andrey Kuzmin
Mid-infrared resonant cavity light emitting diodes operating at 4.5 µm
Infrared (IR) transmission spectroscopy is used for the identification of a number of combustible and atmospheric pollutant gases, as well as for human breath analysis. To extend the IR instrumentation potential, especially for in-field and in-home applications, a hand-held inexpensive design of analyzer units is required. The recent progress in developing room temperature light emitting diodes (LEDs) in the mid-IR range holds considerable promise for the satisfaction of this requirement.
The authors of the paper published in Optics Express have reported on a mid-IR resonant cavity LED (RCLED) operating at the wavelength of 4.5 μm with a narrow spectral linewidth at room temperature, enabling these devices to be used for the detection of N2O at 4.5 μm. At the same time, only minor cavity adjustments are required for probing CO2 (4.2 μm) and CO (4.6 μm). Compared to a usual LED, the resonant cavity LED exhibits higher peak intensity and integrated output power, a narrower spectral linewidth and a superior temperature stability, which make RCLED a promising IR source for hand-held analyzers.
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The authors of the paper published in Optics Express have reported on a mid-IR resonant cavity LED (RCLED) operating at the wavelength of 4.5 μm with a narrow spectral linewidth at room temperature, enabling these devices to be used for the detection of N2O at 4.5 μm. At the same time, only minor cavity adjustments are required for probing CO2 (4.2 μm) and CO (4.6 μm). Compared to a usual LED, the resonant cavity LED exhibits higher peak intensity and integrated output power, a narrower spectral linewidth and a superior temperature stability, which make RCLED a promising IR source for hand-held analyzers.
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Article Information
Mid-infrared resonant cavity light emitting diodes operating at 4.5 µm
Furat A. Al-Saymari, Adam P. Craig, Qi Lu, Andrew R. J. Marshall, Peter J. Carrington, and Anthony Krier
Opt. Express 28(16) 23338-23353 (2020) View: Abstract | HTML | PDF