Subnatural linewidth in room-temperature Rb vapor using a control laser

Journal Article · Thu May 01 04:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.053802· OSTI ID:20636414

Rapol, Umakant D; Wasan, Ajay; Natarajan, Vasant ^[1]

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1. Department of Physics, Indian Institute of Science, Bangalore 560 012 (India)

We demonstrate two ways of obtaining subnatural linewidth for probe absorption through room-temperature Rb vapor. Both techniques use a control laser that drives the transition from a different ground state. The coherent drive splits the excited state into two dressed states (Autler-Townes doublet), which have asymmetric linewidths when the control laser is detuned from resonance. In the first technique, the laser has a large detuning of 1.18 GHz to reduce the linewidth to 5.1 MHz from the Doppler width of 560 MHz. In the second technique, we use a counterpropagating pump beam to eliminate the first-order Doppler effect. The unperturbed probe linewidth is about 13 MHz, which is reduced below 3 MHz (0.5{gamma}) at a detuning of 11.5 MHz.

• OSTI ID: 20636414
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ASYMMETRY
CONTROL
DOPPLER EFFECT
EXCITED STATES
GHZ RANGE
GROUND STATES
LASER RADIATION
LINE WIDTHS
MHZ RANGE
OPTICS
PHOTON-ATOM COLLISIONS
PROBES
QUANTUM MECHANICS
RESONANCE
RUBIDIUM
STARK EFFECT
VAPORS