Conditions for converting 3.39-µm He-Ne laser radiation to the visible in atomic cesium vapor

Vitaliy V. Slabko, A. K. Popov, V. F. Lukinykh

Vasily G. Arkhipkin, A. K. Popov, V. P. Timofeev +1 more

Frequency conversion of cw CO 2 laser radiation to the 276.8 nm ultraviolet range was achieved in a mixture of thallium and cesium vapor by parametric mixing with radiation from a rhodamine 6G dye laser. Two-photon resonance of the pump radiation with the 6 P 1/2 –7 P 3/2 forbidden transition and the proximity of the converted radiation frequency to the frequency of the 6 D 3/2 –7 P 3/2 transition in the thallium atom were utilized. Cesium vapor was used to match the refractive indices of the interacting waves.

Victor V. Krasnikov, Vladimir S Solomatin

Richard N. Watts

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.

Armen D. Sargsyan, David G. Sarkisyan

Laser-induced fluorescence (LIF) was studied in the 400–1000 nm wavelength range using narrow-band 852 nm laser radiation resonant with Cs atomic 6S1/2 → 6P3/2 transition. T-shaped cells made entirely of technical sapphire with thicknesses of L = 1 cm, 40 μm, and ~400 nm, containing cesium atomic vapor, were used. It was shown that with the cell thickness decrease (from centimeters to nanometer thicknesses), many LIF signals are suppressed due to an increase in the number of atomic collisions with the walls, leading to quenching of excited states. By recording the LIF signal, it is also possible to estimate the amount of residual Rb atomic vapor (if any exists) in the Cs-containing cell. The Cs vapor cell can serve as an efficient optical frequency converter filter and has other applications.