title: Novel étalon fringe rejection technique for laser absorption spectroscopy.
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 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.
authors: H C
authors: HC
authors: Sun
authors: E A
authors: EA
authors: Whittaker