Conical fluorescence emission from sodium vapor excited with tunable femtosecond light pulses
- Laser Research Center, Vilnius University, Sauletekio 10, Vilnius LT-10223 (Lithuania)
An experimental and theoretical investigation is made of the angular spectrum of a near-resonant femtosecond laser pulse propagating through sodium vapor. A directional fluorescence emission corresponding to single-photon sodium transition 3S{yields}3P{sub 1} at {sub {approx}}{sub sol{approx}} at {sub 2,3} at {sub {approx}}{sub sol{approx}} at {sub 2} has been registered for the pump wavelength ranging from 540 to 605 nm. It is found that such emission can be detected under the conditions of single-photon (enhanced by two-photon) resonance of pump frequency with relevant atomic states. Theoretical treatment of the field-matter interaction by means of the nonperturbative (semiclassical) approach revealed conical components of the cylindrically symmetric beam spectrum originating both from the fluorescence induced by coherent atomic polarization and four-wave mixing.
- OSTI ID:
- 20982399
- Journal Information:
- Physical Review. A, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevA.75.033808; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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