Open AccessCavity mode-width spectroscopy with widely tunable ultra narrow laser
Author(s) -
A. Cygan,
Daniel Lisak,
Piotr Morzyński,
Marcin Bober,
M. Zawada,
E. Pazderski,
R. Ciuryło
Publication year - 2013
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.029744
Subject(s) - optics , cavity ring down spectroscopy , materials science , laser , spectroscopy , tunable diode laser absorption spectroscopy , attenuation coefficient , optical cavity , absorption (acoustics) , tunable laser , wavelength , absorption spectroscopy , diode , optoelectronics , physics , quantum mechanics
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.