A characteristic analysis of laser resonators

Sato, Keiichi; Yamahatsu, W.; Sunako, Katsuhiko; Yamaguchi, Shigeru; Endo, Masamori; Nanri, Kenzo; Fujioka, Tomoo

doi:10.1109/cleopr.2003.1277145

Cited by 1 publication

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“…This has led to a variety of multipass cell configurations, such as White [4], Herriott [5], astigmatic mirror based [6] and variations of cylindrical and spherical mirrors [7][8][9]. These cells have very stringent requirements for the distance, axial angle and tilt of the mirrors.…”

Section: Introductionmentioning

confidence: 99%

Versatile multipass cell for laser spectroscopic trace gas analysis

et al. 2012

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The design, construction and characterization of a novel circular multipass cell for sensitive trace gas analysis are presented. This cell allows for easy modification of the optical path length without any changes of its physical parameters. Furthermore, it is suited for three different detection techniques: direct absorption, wavelength modulation and photoacoustics. To demonstrate its performance, mixing ratios of 13 CO 2 and N 2 O were measured from ambient air, using a quantum cascade laser. With the direct absorption method, noise equivalent 1-s precisions of 2.7 ppb and 0.2 ppb are achieved for 13 CO 2 and N 2 O, respectively. The wavelength modulation technique resulted in 4.3 ppb precision with 1-s averaging for the 13 CO 2 measurements. A Q-factor of 190 and a normalized noise equivalent minimum absorption of 1.3 × 10 −8 cm −1 W Hz −1/2 are achieved using the photoacoustic technique.A. Manninen ( ) · B. Tuzson · L. Emmenegger

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