Abstract

We demonstrate high-quality FM spectra with nanosecond laser pulses. Transform-limited pulses with FM sidebands are produced by pulsed amplification of a phase-modulated cw laser. The pulses can be shifted to the UV by nonlinear mixing. We report both initial experiments on I2 and what is to our knowledge the first observation of a far-UV transition by FM spectroscopy, at 214.5 nm. Major advantages of this method include (1) spectral resolution of the order of 0.001 cm−1, (2) better-defined optical phase, and (3) a much smaller and more easily detected modulation frequency, ~500 MHz. The absorption sensitivity is ~10−4, and considerable further improvement is expected.

© 1996 Optical Society of America

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References

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1994 (3)

1986 (1)

1985 (1)

1984 (1)

1983 (1)

1982 (1)

1980 (1)

1965 (1)

S. E. Harris, M. K. Oshman, B. J. McMurty, E. O. Ammann, Appl. Phys. Lett. 7, 185 (1965).
[CrossRef]

Amit, M.

Ammann, E. O.

S. E. Harris, M. K. Oshman, B. J. McMurty, E. O. Ammann, Appl. Phys. Lett. 7, 185 (1965).
[CrossRef]

Bjorklund, G. C.

Bloch, J. C.

M. C. McCarthy, J. C. Bloch, R. W. Field, J. Chem. Phys. 100, 6331 (1994).
[CrossRef]

Evez, G.

Eyler, E. E.

Field, R. W.

M. C. McCarthy, J. C. Bloch, R. W. Field, J. Chem. Phys. 100, 6331 (1994).
[CrossRef]

Gallagher, T. F.

Gangopadhyay, S.

Gehrtz, M.

Gounard, F.

Harris, S. E.

S. E. Harris, M. K. Oshman, B. J. McMurty, E. O. Ammann, Appl. Phys. Lett. 7, 185 (1965).
[CrossRef]

Kachru, R.

Lavi, S.

Lenth, W.

Liran, Y.

Lotem, H.

McCarthy, M. C.

M. C. McCarthy, J. C. Bloch, R. W. Field, J. Chem. Phys. 100, 6331 (1994).
[CrossRef]

McMurty, B. J.

S. E. Harris, M. K. Oshman, B. J. McMurty, E. O. Ammann, Appl. Phys. Lett. 7, 185 (1965).
[CrossRef]

Melikechi, N.

Oshman, M. K.

S. E. Harris, M. K. Oshman, B. J. McMurty, E. O. Ammann, Appl. Phys. Lett. 7, 185 (1965).
[CrossRef]

Pillet, P.

Supplee, J. M.

Tran, N. H.

van Linden van den Heuvell, H. B.

Watjen, J. P.

Whittaker, E. A.

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Figures (3)

Fig. 1
Fig. 1

(a) Typical pulse after passing through an I2 cell, showing FM beats at 380 MHz superposed upon an otherwise smooth envelope. (b) Fourier spectrum of the same pulse.

Fig. 2
Fig. 2

Pulsed-laser FM absorption in an I2 cell, with 10–15% absorption at the strongest features.

Fig. 3
Fig. 3

Pulsed-laser FM absorption spectrum of the S21(7) line of the (1–0) band of the AX transition in NO. A frequency-tripled laser provides the required 214.5-nm radiation. The peak absorption of 58% is actually somewhat too large for an optimum FM signal.

Equations (1)

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[ cos ω t + M / 2 cos ( ω + ω rf ) t ] n .

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