Laser Induced Blue Fluorescence in Cs Atomic Vapor Caused by 852 nm Radiation

Using laser radiation with a wavelength of 852 nm, which is in resonance with Cs atoms, the bright laser-induced fluorescence (LIF) on the blue lines of 456 and 459 nm (transitions 6S_1/2 → 7P_3/2 and 6S_1/2 → 7 P_1/2) was studied by the transition 6S_1/2 → 6P_3/2. A 1 cm long T-shaped sapphire cell containing Cs atomic vapors was used. The LIF power was investigated as a function of the cell temperature. A linear dependence of the LIF power on the pump radiation was observed. The LIF reached a maximum at 100°C. It is shown that the Cs cell can serve as an effective optical up-converter filter of radiation with a wavelength of 852 nm to radiation with a wavelength of 456 nm.