The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics

, Volume 28, Issue 3, pp 317–322

Doppler-free spectroscopy in driven three-level systems


DOI: 10.1140/epjd/e2003-00319-x

Cite this article as:
Rapol, U.D. & Natarajan, V. Eur. Phys. J. D (2004) 28: 317. doi:10.1140/epjd/e2003-00319-x


We demonstrate two techniques for studying the features of three-level systems driven by two lasers (called control and probe), when the transitions are Doppler broadened as in room-temperature vapor. For \(\Lambda\)-type systems, the probe laser is split to produce a counter-propagating pump beam that saturates the transition for the zero-velocity atoms. Probe transmission then shows Doppler-free peaks which can even have sub-natural linewidth. For V-type systems, the transmission of the control beam is detected as the probe laser is scanned. The signal shows Doppler-free peaks when the probe laser is resonant with transitions for the zero-velocity group. Both techniques greatly simplify the study of three-level systems since theoretical predictions can be directly compared without complications from Doppler broadening and the presence of multiple hyperfine levels in the spectrum.

Copyright information

© Springer-Verlag Berlin/Heidelberg 2004

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of ScienceBangaloreIndia