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 étalon fringes while preserving the true absorption signal over a wide range of étalon free spectral range to absorption linewidth ratios. We present a theoretical analysis and experimental verification by using a tunable lead salt diode laser.
© 1992 Optical Society of America
Original Manuscript: October 30, 1991
Published: August 20, 1992
H. C. Sun and E. A. Whittaker, "Novel étalon fringe rejection technique for laser absorption spectroscopy," Appl. Opt. 31, 4998-5002 (1992)