Scientific Results

Dark-state resonances observed on the D2 line of potassium

Year: 2017

Authors: Krasteva A., Gateva S., Andreeva C., Alzetta G., Gozzini S., Moi L., Sarkisyan D., Nasyrov K., Cartaleva S.

Autors Affiliation: Institute of Electronics, BAS, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria; Istituto
Nazionale di Ottica del CNR – SS Pisa, Via Moruzzi 1, 56124 Pisa, Italy; Institute for Physical Research, NAS of Armenia, Ashtarak-2, 0203 Armenia; Institute of Automation and Electrometry SB RAS, Novosibirsk, Russia

Abstract: We report the first observation of sub-natural-width dark resonances of enhanced transparency on the D2 line of
potassium, contained in an optical cell with reduced (8mm) dimensions and buffered by 30Torr of Ne. The Potassium
vapours are irradiated by a frequency modulated DFB diode laser light (with λ = 766.7nm and 2MHz bandwidth), and
are placed in orthogonal to the light magnetic field scanned around zero value. Very good signal-to-noise ratio and
narrow (~20kHz) dark resonances are observed and studied in unshielded laboratory environment. The dark resonance
formation is related to coherent superposition of the ground-state Zeeman sublevels by respective components of the frequency-modulated light


Volume: 10226      Pages from: 102260L-1  to: 102260L-8

More Information: doi: 10.1117/12.2264223
KeyWords: dark state; sub-natural-width optical resonances;