Spectroscopy of Rb atoms in hollow-core fibers

Coupling Thermal Atomic Vapor to Slot Waveguides

“…Currently, various strategies exist to interface atoms with confined light fields, for example, atoms in hollow waveguides (ARROWs) [1,2], hollow core fibers [3,4], and tapered nanofibers [5][6][7]. A further scheme has recently been demonstrated by combining chip-based solid core waveguides [8][9][10], MachZehnder interferometers [8], and ring resonators [11,12] with thermal atomic vapor.…”

Cladding defects in hollow core fibers for surface mode suppression and improved birefringence

“…fiber optic gyroscopes and gas spectroscopy [1,2]. Even though they offer unique properties, like very high optical depth [3] and low non-linearity, they also show some limitations. One of the drawbacks of HC-PBG is the presence of surface modes (SMs), i.e.…”

Continuous generation of rubidium vapor in hollow-core photonic bandgap fibers

“…A drawback for the warm Rb-filled PBGF platform has been the short time scales of operation, ranging from about a few seconds to a minute. Furthermore, the system requires an extended duration (> 3 hrs) to re-establish high OD operation [9,13,22]. Theories have been proposed to understand the dynamics of Rb atoms inside the fiber core and their interaction with the inner walls of the core [9].…”

“…We fit the probe absorption data to a Voigt profile (red curve) which takes into account both the homogenous (Lorentzian) and inhomogenously Doppler broadened (Gaussian) line shapes. Since the Rb atoms are confined to a 6-µm core, the interaction time with the optical mode is limited to the time it takes for the atoms to move across the beam and leads to transit-time broadening of the absorption lines, which we take into account while simulating the Voigt function [22,26]. The temperature of the Rb atoms inside the core is inferred to be T ∼ 500 K from the Voigt function fit in Fig 2(a)-(b).…”

“…Typically for our experiments exploring nonlinear interactions with Rb vapor, we choose a vapor generation beam wavelength of 805 nm, since it is far away from both the Rb D 1 and D 2 lines and hence would not lead to any resonant interaction with Rb vapor or cause significant AC stark shifting of its hyperfine levels at high intensities [22]. Additionally, it is easy to separate a probe tuned to any Rb transition from the vapor generation beam using a The curve in red shows the transmission data of the fiber and defines its band-gap [27].…”