Abstract

We demonstrate a new technique for saturated-absorption spectroscopy by use of copropagating beams that does not have the problem of crossover resonances. The pump beam is locked to a transition, and its absorption signal is monitored while the probe beam is scanned. As the probe comes into resonance with another transition, the pump absorption is reduced and the signal shows a Doppler-free dip. We use this technique to measure hyperfine intervals in the D2 line of  85Rb with a precision of 70 kHz and to resolve hyperfine levels in the D2 line of  39K that are less than 10 MHz apart.

© 2003 Optical Society of America

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References

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  1. W. Demtröder, Laser Spectroscopy (Springer-Verlag, Berlin, 1982).
  2. A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
    [CrossRef]
  3. E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
    [CrossRef]
  4. R. Grimm J. Mlynek, Appl. Phys. B 49, 179 (1989).
    [CrossRef]
  5. U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
    [CrossRef]
  6. A. Banerjee, D. Das, and V. Natarajan, Opt. Lett. 28, 1579 (2003).
    [CrossRef] [PubMed]
  7. SAES Getters S.p.A., Viale Italia 77–1-20020, Lainate (MI), Italy.
  8. U. D. Rapol and V. Natarajan, “Doppler-free spectroscopy in driven three-level systems,” Eur. Phys. J. D (to be published).

2003

U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
[CrossRef]

A. Banerjee, D. Das, and V. Natarajan, Opt. Lett. 28, 1579 (2003).
[CrossRef] [PubMed]

2001

A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
[CrossRef]

1989

R. Grimm J. Mlynek, Appl. Phys. B 49, 179 (1989).
[CrossRef]

1977

E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
[CrossRef]

Arimondo, E.

E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
[CrossRef]

Banerjee, A.

A. Banerjee, D. Das, and V. Natarajan, Opt. Lett. 28, 1579 (2003).
[CrossRef] [PubMed]

A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
[CrossRef]

Das, D.

Demtröder, W.

W. Demtröder, Laser Spectroscopy (Springer-Verlag, Berlin, 1982).

Grimm, R.

R. Grimm J. Mlynek, Appl. Phys. B 49, 179 (1989).
[CrossRef]

Inguscio, M.

E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
[CrossRef]

Krishna, A.

U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
[CrossRef]

Mlynek, J.

R. Grimm J. Mlynek, Appl. Phys. B 49, 179 (1989).
[CrossRef]

Natarajan, V.

U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
[CrossRef]

A. Banerjee, D. Das, and V. Natarajan, Opt. Lett. 28, 1579 (2003).
[CrossRef] [PubMed]

A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
[CrossRef]

U. D. Rapol and V. Natarajan, “Doppler-free spectroscopy in driven three-level systems,” Eur. Phys. J. D (to be published).

Rapol, U. D.

U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
[CrossRef]

A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
[CrossRef]

U. D. Rapol and V. Natarajan, “Doppler-free spectroscopy in driven three-level systems,” Eur. Phys. J. D (to be published).

Violino, P.

E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
[CrossRef]

Wasan, A.

A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
[CrossRef]

Appl. Phys. B

R. Grimm J. Mlynek, Appl. Phys. B 49, 179 (1989).
[CrossRef]

Appl. Phys. Lett.

A. Banerjee, U. D. Rapol, A. Wasan, and V. Natarajan, Appl. Phys. Lett. 79, 2139 (2001).
[CrossRef]

Eur. Phys. J. D

U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
[CrossRef]

Eur. Phys. J. D

U. D. Rapol and V. Natarajan, “Doppler-free spectroscopy in driven three-level systems,” Eur. Phys. J. D (to be published).

Opt. Lett.

Rev. Mod. Phys.

E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
[CrossRef]

Other

SAES Getters S.p.A., Viale Italia 77–1-20020, Lainate (MI), Italy.

W. Demtröder, Laser Spectroscopy (Springer-Verlag, Berlin, 1982).

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Figures (4)

Fig. 1
Fig. 1

Schematic of the experiment. The pump laser is locked to a hyperfine transition in Rb, and the probe laser is scanned by double passing it through an AOM and scanning the AOM frequency. The two beams copropagate through a Rb vapor cell. The angle between them has been exaggerated for clarity. BS, beam splitter; Ms, mirrors; PD, photodiode.

Fig. 2
Fig. 2

Saturated-absorption spectrum in the D2 line of  85Rb for F=2F transitions. The underlying Doppler profile has been subtracted. The transitions are labeled with the value of F and crossover resonances with the two values of F in brackets. The upper trace is the correct spectrum, and the lower trace is obtained when the pump intensity is increased by a factor of 2, resulting in inversion of the F=1,2 peak. Probe detuning is measured from the unperturbed state.

Fig. 3
Fig. 3

 85Rb spectrum obtained with new technique. The transitions are the same as in Fig. 2, with a narrow scan around the F=1 and F=2 levels. The frequency scale on the x axis is set by the voltage-controlled oscillator driving the AOM. The Lorentzian fit (solid curve) yields a value of 29.35(7) MHz for the hyperfine interval.

Fig. 4
Fig. 4

Saturated-absorption spectrum in the D2 line of  39K. The top trace shows the probe-transmission signal for F=2F transitions in usual saturated-absorption spectroscopy. The six peaks are merged into a single peak since the hyperfine levels lie within 30 MHz, as shown in the inset. The values in the inset are the frequency offset (in megahertz) of each hyperfine level from the unperturbed state. The bottom trace is the pump-transmission signal obtained with the new technique, clearly showing the locations of the hyperfine levels.

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