Demonstration of cavity enhanced FTIR spectroscopy using a femtosecond laser absorption source.
A proof of principle experiment was performed by recording the cavity enhanced absorption spectrum of the weak b-X transition of molecular oxygen in the atmosphere using a Ti:Sa femtosecond laser as an absorption source and a high resolution continuous scan Fourier transform interferometer. The cavity was mode matched and either continuously scanned or stabilized at the so-called magic point. An optimal rms noise equivalent absorption of 3x10(-7) cm(-1) Hz(-1/2) was reached in the latter case, corresponding to alpha(min)=3x10(-7) cm(-1).
Kassi
S
S
Laboratoire de Spectrométrie Physique (associated with CNRS, UMR 5588), Université Joseph Fourier de Grenoble, Saint-Martin-d'Hères Cedex, France.
Didriche
K
K
Lauzin
C
C
Vaernewijckb
X de Ghellinck d'Elseghem
Xde G
Rizopoulos
A
A
Herman
M
M
D000042:Absorption; D007834:Lasers; D010100:Oxygen / Q000737:chemistry*; D012493:Samarium / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000295:instrumentation / Q000379:methods; D014025:Titanium / Q000737:chemistry
D012493:Samarium; D014025:Titanium; D010100:Oxygen