Compact multi-watt QCL module

Münzhuber, Franz; Späth, Luisa; Tholl, Hans Dieter

doi:10.1117/12.2636264

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Quantum cascade lasers can produce high output power at a range of infrared emission wavelengths, including both narrowband and broad spectral emissions. Two relevant defense applications of QCLs include optical countermeasures [1], [2], [3] and standoff detection of chemical, biological, and explosive materials [4], [5], [6]. Additionally, our group has used Fabry-Perot QCLs for more general spectroscopic applications as well [7], [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Advances in real time spectroscopy using a grating spectrometer and broadband IR laser source

Finton

Kendziora

2023

Next-Generation Spectroscopic Technologies XV

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We present the results of characterizing and using a quantum cascade laser as a broadband infrared source for real-time spectroscopy. Using a Fabry-Perot quantum cascade laser (FP-QCL), we illuminate samples with “white” light from 8.2μm to 10.2μm. This laser source and its operating conditions (25°C and 500ns pulses at 200kHz) were chosen to give broad spectral coverage and high power output (42.7mW average power, pulsed operation). We utilized a simple grating spectrometer together with a micro-bolometer focal plane array to capture each full spectrum in a single frame. Several samples were characterized using this apparatus in a transmission-style measurement and their real-time spectra were compared to their Fourier Transform Infrared (FTIR) spectra. The results show a good agreement between FTIR and the real-time grating spectrometer for several exemplar samples, including bandpass filters, isopropanol vapor, and samples of IR active materials such as PTFE and polystyrene.

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Section: Introductionmentioning

confidence: 99%

Advances in real time spectroscopy using a grating spectrometer and broadband IR laser source

Finton

Kendziora

2023

Next-Generation Spectroscopic Technologies XV

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Single image spectroscopy using a grating spectrometer and a broadband IR laser source

Kendziora,

Huffman

2024

Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XXV

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We present recent results from using a quantum cascade laser as a broadband infrared source for real-time spectroscopy. Using a Fabry-Perot quantum cascade laser (FP-QCL), we illuminate samples with broadband IR light from 8.2 µm to 10.2 µm. This laser source and its operating conditions (25°C and 500 ns pulses at 200 kHz repetition rate) were chosen to give broad spectral coverage and high power output (42.7 mW average power, pulsed operation). We utilized a simple grating spectrometer together with a high resolution (1280 x 1024 pixel) micro-bolometer focal plane array to capture each full spectrum in a single frame. Several samples were characterized using this apparatus in a transmission-style measurement and their real-time spectra were compared to their Fourier Transform Infrared (FTIR) spectra. The results show a good agreement between FTIR and the real-time grating spectrometer for several representative samples, including bandpass filters, and IR active materials such as polystyrene, polyester, and polypropylene. Finally, we show the real-time benefit of this approach by measuring a moving target foil on a rotating chopper wheel.

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Compact multi-watt QCL module

Cited by 2 publications

References 11 publications

Advances in real time spectroscopy using a grating spectrometer and broadband IR laser source

Advances in real time spectroscopy using a grating spectrometer and broadband IR laser source

Single image spectroscopy using a grating spectrometer and a broadband IR laser source

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