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Blue Laser Induced Bright Red Fluorescence in Hot Cesium Vapor

Armen D. Sargsyan, Anahit L. Gogyan, David G. Sarkisyan

Jan 1, 20240 citations

Fluorescence monitoring of laser induced population changes of 6P and 6D levels in cesium vapor

Dimitri Pappas, Nathan C. Pixley, Benjamin W. Smith +1 more

Spectrochimica Acta Part B Atomic SpectroscopySep 1, 20006 citations

Blue laser induced bright red fluorescence in hot cesium vapor

Armen D. Sargsyan, Anahit L. Gogyan, David G. Sarkisyan

We have observed laser-induced fluorescence using 456 nm laser radiation, resonant with the 6S1/2-7P3/2 transition in Cs atoms. It includes red emission lines in the range of 580-730 nm and a prominent line at 852 nm corresponding to the 6P3/2-6S1/2 transition. A T-shaped all-sapphire cell with a length of 1 cm, containing Cs atomic vapor and capable of being heated up to 500 oC, was used. The laser-induced fluorescence (LIF) power at 852 nm was investigated as a function of the cell temperature. The maximum LIF power was achieved at 130 oC, while a significant decrease was observed around 300 oC. At 130 oC, the Doppler-broadened LIF spectrum at 852 nm exhibited self-conversion, resulting in the formation of two distinct peaks within the spectrum. The LIF power at 852 nm was also studied as a function of the 456 nm radiation power. The Cs cell demonstrated potential as an efficient optical filter and down-converter, effectively transforming 456 nm radiation into 852 nm radiation.We have observed laser-induced fluorescence using 456 nm laser radiation, resonant with the 6S1/2-7P3/2 transition in Cs atoms. It includes red emission lines in the range of 580-730 nm and a prominent line at 852 nm corresponding to the 6P3/2-6S1/2 transition. A T-shaped all-sapphire cell with a length of 1 cm, containing Cs atomic vapor and capable of being heated up to 500 oC, was used. The laser-induced fluorescence (LIF) power at 852 nm was investigated as a function of the cell temperature. The maximum LIF power was achieved at 130 oC, while a significant decrease was observed around 300 oC. At 130 oC, the Doppler-broadened LIF spectrum at 852 nm exhibited self-conversion, resulting in the formation of two distinct peaks within the spectrum. The LIF power at 852 nm was also studied as a function of the 456 nm radiation power. The Cs cell demonstrated potential as an efficient optical filter and down-converter, effectively transforming 456 nm radiation into 852 nm radiation.

arXiv:2412.19081Dec 26, 20240 citations

Heating of cold cesium atoms by blue-detuned laser radiation

Basrul Bahar, J. Castellanos, Udo Hübner +1 more

Applied Physics BMar 1, 19980 citations

Towards Superfluorescence in Cesium Vapor

Gombojav O. Ariunbold, Dmitry Pestov, Hebin Li +6 more

Bulletin of the American Physical SocietyOct 19, 20070 citations

Multichannel laser-induced fluorescence in rubidium and residual cesium hot atomic vapours

Armen D. Sargsyan, Anahit L. Gogyan, David G. Sarkisyan

Abstract Laser-induced fluorescence (LIF) in the spectral range of 400–1000 nm has been investigated in rubidium vapor excited by narrowband diode laser radiation at 780 nm and 795 nm, resonant with the 5 S 1 / 2 → 5 P 1 / 2 , 3 / 2 transitions. Experiments were performed using three specially fabricated all-sapphire cells with thicknesses of L = 1 cm, 10 μ m, and 500 nm. Multiple fluorescence channels were observed, and it is shown that many LIF signals are suppressed with decreasing cell thickness due to enhanced atom–wall collisions leading to quenching of excited states. Nevertheless, for a nanocell of thickness L = 500 nm at temperatures of ∼ 300 ∘ C, blue fluorescence at 420 nm remains observable, and its intensity is compared with results available in the literature. It is further demonstrated that LIF spectroscopy enables detection and estimation of residual cesium vapor in rubidium cells via energy-transfer processes. In addition, the Rb vapor cell can operate as an efficient optical filter and frequency up-converter, converting radiation at 780 nm or 795 nm into shorter wavelengths, notably 420 nm. These results highlight the potential of broadband LIF spectroscopy in alkali vapors for applications in precision measurements, optical frequency standards, and quantum technologies.Abstract Laser-induced fluorescence (LIF) in the spectral range of 400–1000 nm has been investigated in rubidium vapor excited by narrowband diode laser radiation at 780 nm and 795 nm, resonant with the 5 S 1 / 2 → 5 P 1 / 2 , 3 / 2 transitions. Experiments were performed using three specially fabricated all-sapphire cells with thicknesses of L = 1 cm, 10 μ m, and 500 nm. Multiple fluorescence channels were observed, and it is shown that many LIF signals are suppressed with decreasing cell thickness due to enhanced atom–wall collisions leading to quenching of excited states. Nevertheless, for a nanocell of thickness L = 500 nm at temperatures of ∼ 300 ∘ C, blue fluorescence at 420 nm remains observable, and its intensity is compared with results available in the literature. It is further demonstrated that LIF spectroscopy enables detection and estimation of residual cesium vapor in rubidium cells via energy-transfer processes. In addition, the Rb vapor cell can operate as an efficient optical filter and frequency up-converter, converting radiation at 780 nm or 795 nm into shorter wavelengths, notably 420 nm. These results highlight the potential of broadband LIF spectroscopy in alkali vapors for applications in precision measurements, optical frequency standards, and quantum technologies.

Laser PhysicsAug 17, 20260 citations

Blue laser induced bright red fluorescence in hot cesium vapor

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Blue laser induced bright red fluorescence in hot cesium vapor

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