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Optics Letters

Optics Letters


  • Vol. 28, Iss. 20 — Oct. 15, 2003
  • pp: 1912–1914

Saturated-absorption spectroscopy: eliminating crossover resonances by use of copropagating beams

Ayan Banerjee and Vasant Natarajan  »View Author Affiliations

Optics Letters, Vol. 28, Issue 20, pp. 1912-1914 (2003)

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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

OCIS Codes
(020.2930) Atomic and molecular physics : Hyperfine structure
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6460) Spectroscopy : Spectroscopy, saturation

Ayan Banerjee and Vasant Natarajan, "Saturated-absorption spectroscopy: eliminating crossover resonances by use of copropagating beams," Opt. Lett. 28, 1912-1914 (2003)

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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).
  3. E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977).
  4. R. Grimm J. Mlynek, Appl. Phys. B 49, 179 (1989).
  5. U. D. Rapol, A. Krishna, and V. Natarajan, Eur. Phys. J. D 23, 185 (2003).
  6. A. Banerjee, D. Das, and V. Natarajan, Opt. Lett. 28, 1579 (2003).
  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).

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