Portable broadband photoacoustic spectroscopy for trace gas detection by quantum cascade laser arrays
| Autor: | Masud Azimi, Chien-Sheng Liao, Daryoosh Vakhshoori, Christian Pfluegl, Fred Huettig, Romain Blanchard |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Photoacoustic imaging in biomedicine 02 engineering and technology 021001 nanoscience & nanotechnology Laser 01 natural sciences Atomic and Molecular Physics and Optics Trace gas law.invention 010309 optics Optics law Power consumption 0103 physical sciences Broadband 0210 nano-technology Quantum cascade laser business Photoacoustic spectroscopy Excitation |
| Zdroj: | Optics letters. 45(12) |
| ISSN: | 1539-4794 |
| Popis: | We report a portable broadband photoacoustic spectroscopic system for trace gas detection using distributed feedback quantum cascade laser arrays. By sequentially firing 128 lasers, our system acquires a photoacoustic spectrum covering 565 c m − 1 ( 935 − 1500 c m − 1 ) with a normalized-noise-equivalent-absorption coefficient of 2.5 × 10 − 9 c m − 1 W H z − 1 / 2 . The firing sequence that determines when and which laser to activate is programmable, which enables frequency-multiplexing excitation. For demonstration, 12 lasers are modulated simultaneously at distinct frequencies, and a photoacoustic spectrum is acquired within 13 ms. The compactness ( 28 c m × 17 c m × 13 c m , 3.5 kg) and low power consumption enable convenient installation for on-site monitoring. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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