Upper-laser-level lifetime measurement of rear earth dopant in active fiber

Tunable Rare-Earth Doped Fiber Laser

A Multi-Functional Fiber Laser Lidar for Earth Science & Exploration

A multi-pixel laser altimeter using pseudo-randomnoise-modulated fiber lasers has been developed for Climate Change research and Exploration. The architecture supports a wide set of operational parameters (range resolution, range ambiguity interval, temporal update rate) without modifications to the hardware. These parameters can be changed dynamically, based on mission operational needs. The i...

Lifetime measurement of the 9s level of atomic francium.

We use two-photon resonant excitation and time-correlated single-photon counting techniques on a sample of 210Fr atoms confined and cooled in a magneto-optical trap to measure the lifetime of the 9s excited level. Direct measurement of the decay through the 7P(3/2) level at 851 nm yields a lifetime of 107.53 +/- 0.80 ns.

Lifetime measurement of the 6s level of rubidium

We present a lifetime measurement of the 6s level of rubidium. We use a time-correlated single-photon counting technique on two different samples of rubidium atoms, a vapor cell with variable rubidium density, and a sample of atoms confined and cooled in a magneto-optical trap. The 5P1/2 level serves as the resonant intermediate step for the two-step excitation to the 6s level. We detect the de...

Optical Fiber Drawing and Dopant Transport

Abstract. Optical fibers are made of glass with different refractive indices in the (inner) core and the (outer) cladding regions. The difference in refractive index arises due to a rapid transition in the concentration of a dopant across the boundary between these two regions. Fibers are normally drawn from a heated glass preform, and the different dopant concentrations in the two regions will...