Abstract

We demonstrate the principle of cavity enhanced absorption with femtosecond modelocked lasers. The wide spectral coverage allowed by these sources makes this a promising high�??sensitivity linear absorption technique. The uniformity of the modelocked frequency comb is the feature allowing effective injection of a high finesse cavity. The smooth and stable laser spectral profile guarantees a good background for the intracavity sample absorption spectrum, recorded by a spectrograph and a linear detector array. With a modelocked Ti:Sa laser and a cavity of finesse F 420 (F/�? is the enhancement factor) we obtain a 4nm section of a weak overtone band in 40 ms with 0.2 cm-1resolution,a nd a detection limit of 2�?10-7/cm/�??Hz.

© 2002 Optical Society of America

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    [CrossRef]
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    [CrossRef]
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Appl. Opt. (2)

Appl. Phys. B (1)

R. Holzwarth, A. Y. Nevsky, M. Zimmermann, T. Udem, T.W. Hansch, J. V. Zanthier, H.Walther, J. C. Knight, W. J. Wadsworth, P. S. J. Russell, M. N. Skvortsov, and S. N. Bagayev, �??Absolute frequency measurement of iodine lines with a femtosecond optical synthesizer,�?? Appl. Phys. B 73, 269�??271 (2001).

Chem. Phys. Lett. (1)

D. Romanini, A. A. Kachanov, N. Sadeghi, and F. Stoeckel, �??CW�??cavity ring down spectroscopy,�?? Chem. Phys. Lett. 264, 316�??322 (1997).
[CrossRef]

IEEE J. Quantum Electron. (1)

R. Holzwarth, M. Zimmermann, T. Udem, and T. W. Hansch, �??Optical clockworks and the measurement of laser frequencies with a modelocked frequency comb,�?? IEEE J. Quantum Electron. 37, 1493�??1500 (2001).
[CrossRef]

J. Chem. Phys. (1)

B. C. Smith and J. S. Winn, �??The overtone dynamics of acetylene above 10 000 cm-1,�?? J. Chem. Phys. 94, 4120�??4130 (1991).
[CrossRef]

Opt. Commun. (2)

A. I. Ferguson and R. A. Taylor Opt. Commun. 41, 271 (1982).
[CrossRef]

K. Nakagawa, T. Katsuda, A. Shelkovnikov, M. de Labachelerie, and M. Ohtsu, �??Highly sensitive detection of molecular absorption using a high finesse optical cavity,�?? Opt. Commun. 107, 369�??372 (1994).
[CrossRef]

Opt. Lett. (1)

Phys. Rev. Lett. (3)

T. Udem, J. Reichert, R. Holzwarth, and T. W. Hansch, �??Absolute optical frequency mesurement of the Cesium D1 line with a modelocked laser,�?? Phys. Rev. Lett. 82, 3568�??3571 (1998).
[CrossRef]

S. A. Diddams, D. J. Jones, J. Ye, S. T. Cundiff, J. L. Hall, J. K. Ranka, R. S. Windeler, R. Holzwarth, T. Udem, and T. W. Hansch, �??Direct link between microwave and optical frequencies with a 300 THz femtosecond laser comb,�?? Phys. Rev. Lett. 84, 5102�??5105 (2000).
[CrossRef]

J. Reichert, M. Niering, R. Holzwarth, M. Weitz, T. Udem, and T. W. Hansch, �??Phase coherent vacuum�??ultraviolet to radio frequency comparison with a modelocked laser,�?? Phys. Rev. Lett. 84, 3232�??3235 (2000).
[CrossRef]

Proc. SPIE (1)

J. Ye, L. Ma, and J. Hall, �??Cavity�??enhanced frequency modulation spectroscopy : Advancing optical detection sensitivity and laser frequency stabilization,�?? Proc. SPIE 3270, 85�??96 (1998).

Rev. Sci. Instrum. (1)

R. Engeln, G. Berden, R. Peeters, and G. Meijer, �??Cavity enhanced absorption and cavity enhanced magnetic rotation spectroscopy,�?? Rev. Sci. Instrum. 69, 3763�??3769 (1998).
[CrossRef]

Science (1)

D. J. Jones, S. A. Diddams, J. K. Ranka, A. Stentz, R. S. Windeler, J. L. Hall, and S. T. Cundi., �??Carrier-envelope phase control of femtosecond mode�??locked lasers and direct optical frequency synthesis,�?? Science 288, 635�??639 (2000).
[CrossRef]

Spectrochimica Acta Rev. (1)

A. Campargue, F. Stoeckel, and M. Chenevier, �??High sensitivity intracavity laser spectroscopy: Applications to the study of overtone transitions in the visible range,�?? Spectrochimica Acta Rev. 13, 69�??88 (1990).

Other (1)

D. Romanini, �??Cavity ring down spectroscopy versus intra cavity laser absorption spectroscopy,�?? in Cavity�??Ringdown Spectroscopy �?? A New Technique for Trace Absorption Measurements (K. W. Busch and M. A. Busch, eds.), (Washington, DC, American Chemical Society, 1998).

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