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Optics Letters

Optics Letters


  • Vol. 26, Iss. 19 — Oct. 1, 2001
  • pp: 1507–1509

Frequency-dependent optical pumping in atomic Λ-systems

J. Kitching, L. Hollberg, S. Knappe, and R. Wynands  »View Author Affiliations

Optics Letters, Vol. 26, Issue 19, pp. 1507-1509 (2001)

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We consider the effects of optical pumping on the conversion of laser-frequency modulation into intensity modulation by an atomic absorption line in a vapor of alkali atoms driven in a Λ-configuration. It is found that, due to optical pumping in combination with the excited-state hyperfine structure, the absorption line shape is distorted substantially as the Fourier frequency of the FM is changed. The most significant effect of the distortion is a shift of the apparent line center, which depends on how the frequency of the modulation compares with the optical pumping rate. This shift has implications for locking lasers to atomic transitions and also for FM–AM noise conversion in atomic vapors.

[Optical Society of America ]

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.3690) Atomic and molecular physics : Line shapes and shifts
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(270.1670) Quantum optics : Coherent optical effects
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6420) Spectroscopy : Spectroscopy, nonlinear

J. Kitching, L. Hollberg, S. Knappe, and R. Wynands, "Frequency-dependent optical pumping in atomic Λ-systems," Opt. Lett. 26, 1507-1509 (2001)

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