title: Cavity mode-width spectroscopy with widely tunable ultra narrow laser.
abstract: We explore a cavity-enhanced spectroscopic technique based on determination of the absorbtion coefficient from direct measurement of spectral width of the mode of the optical cavity filled with absorbing medium. This technique called here the cavity mode-width spectroscopy (CMWS) is complementary to the cavity ring-down spectroscopy (CRDS). While both these techniques use information on interaction time of the light with the cavity to determine absorption coefficient, the CMWS does not require to measure very fast signals at high absorption conditions. Instead the CMWS method require a very narrow line width laser with precise frequency control. As an example a spectral line shape of P7 Q6 O₂ line from the B-band was measured with use of an ultra narrow laser system based on two phase-locked external cavity diode lasers (ECDL) having tunability of ± 20 GHz at wavelength range of 687 to 693 nm.
authors: Agata
authors: A
authors: Cygan
authors: Daniel
authors: D
authors: Lisak
authors: Piotr
authors: P
authors: Morzyński
authors: Marcin
authors: M
authors: Bober
authors: Michał
authors: M
authors: Zawada
authors: Eugeniusz
authors: E
authors: Pazderski
authors: Roman
authors: R
authors: Ciuryło
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D007834:Lasers; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*