Internally excited acoustic resonator for photoacoustic trace detection

Sorasak Danworaphong, Irio G. Calasso, Andrew Beveridge, Gerald J. Diebold, Claire Gmachl, Federico Capasso, Deborah L. Sivco, A. Y. Cho

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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-μm, quasi-cw-modulated, room-temperature laser used to detect N2O.

Original languageEnglish (US)
Pages (from-to)5561-5565
Number of pages5
JournalApplied Optics
Issue number27
StatePublished - Sep 20 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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