Novel etalon fringe rejection technique for laser absorption spectroscopy

H. C. Sun, E. A. Whittaker

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

When used for trace-gas detection, laser absorption spectroscopy is usually limited by false absorption signals that are traceable to interferometric effects induced by windows and other pairs of optical surfaces. Here we introduce a new technique that can selectively reject these 6talon fringes while preserving the true absorption signal over a wide range of 6talon free spectral range to absorption linewidth ratios. We present a theoretical analysis and experimental verification by using a tunable lead salt diode laser.

Original languageEnglish
Pages (from-to)4998-5002
Number of pages5
JournalApplied Optics
Volume31
Issue number24
DOIs
StatePublished - 20 Aug 1992

Keywords

  • Laser absorption spectroscopy
  • Optical fringe rejection
  • Tunable diode laser

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