Internally excited acoustic resonator for photoacoustic trace detection |
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Authors: | Danworaphong Sorasak Calasso Irio G Beveridge Andrew Diebold Gerald J Gmachl Claire Capasso Federico Sivco Deborah L Cho A Y |
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Affiliation: | Department of Physics, Brown University, Providence, Rhode Island 02912, USA. |
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Abstract: | The quantum-cascade laser can be used as an infrared source for a small portable photoacoustic trace gas detector. The device that we describe uses a quantum-cascade laser without collimating optics mounted inside an acoustic resonator. The laser is positioned in the center of a longitudinal resonator at a pressure antinode and emits radiation along the length of the resonator exciting an axially symmetric longitudinal acoustic mode of an open-ended cylindrical resonator. Experiments are reported with an 8-microm, quasi-cw-modulated, room-temperature laser used to detect N2O. |
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