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

Drew M. Finton; Christopher A. Kendziora

doi:10.1117/12.2663077

15 June 2023 Advances in real time spectroscopy using a grating spectrometer and broadband IR laser source

Drew M. Finton, Christopher A. Kendziora

Proceedings Volume 12516, Next-Generation Spectroscopic Technologies XV; 125160X (2023) https://doi.org/10.1117/12.2663077
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Abstract

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.

Conference Presentation

Citation Download Citation

Drew M. Finton and Christopher A. Kendziora "Advances in real time spectroscopy using a grating spectrometer and broadband IR laser source", Proc. SPIE 12516, Next-Generation Spectroscopic Technologies XV, 125160X (15 June 2023); https://doi.org/10.1117/12.2663077

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