Improvement of spectral resolution by using the excitation dependence of dipole–dipole interaction in a dense atomic gas

• Published in: Applied physics. B, Lasers and optics Vol. 91; no. 2; pp. 229 - 231
• Main Authors: Li, H., Varzhapetyan, T.S., Sautenkov, V.A., Rostovtsev, Y.V., Chen, H., Sarkisyan, D., Scully, M.O.
• Format: Journal Article
• Language: English; Russian
• Published: Berlin/Heidelberg Springer-Verlag 01.05.2008; Springer
• Subjects: Collisional broadening; Dielectrics; Engineering; Excitation; Hyperfine structure; Lasers; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Pumps; Quantum Optics; Reflection; Rubidium; Pump Laser; Electromagnetically Induce Transparency; Dipole Interaction; Atomic Density; 87Rb
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-008-3006-6

We have studied the selective reflection from the interface between a dense rubidium (Rb) atomic vapor and a transparent dielectric. A remarkable narrowing of the spectrum, which can be used to improve the resolution of spectroscopy of dense media, has been demonstrated. This narrowing results from the reduction of the dipole–dipole interaction between atoms when the Rb vapor is excited by a strong pump laser. By using this technique, we have resolved the hyperfine structure of the Rb D 2 line, which is hidden by collisional broadening.