Lamb-Dicke spectroscopy of atoms in a hollow-core photonic crystal fibre

Abstract

Unlike photons, which are conveniently handled by mirrors and optical fibres without loss of coherence, atoms lose their coherence via atom–atom and atom–wall interactions. This decoherence of atoms deteriorates the performance of atomic clocks and magnetometers, and also hinders their miniaturization. Here we report a novel platform for precision spectroscopy. Ultracold strontium atoms inside a kagome-lattice hollow-core photonic crystal fibre are transversely confined by an optical lattice to prevent atoms from interacting with the fibre wall. By confining at most one atom in each lattice site, to avoid atom–atom interactions and Doppler effect, a 7.8-kHz-wide spectrum is observed for the 1S0−3P1(m=0) transition. Atoms singly trapped in a magic lattice in hollow-core photonic crystal fibres improve the optical depth while preserving atomic coherence time.

Alcohol sensing over O+E+S+C+L+U transmission band based on porous cored octagonal photonic crystal fiber

“…At the beginning time, PCF has limited applications areas. Now PCF is used in fields of THz telecommunications [13], nonlinear optics [14], bio sensing [15], chemical sensing [16,17], spectroscopy [18], optical chromatography [19], and fuel adulteration detection [20]. In medical science, it is becoming more and more popular for bio-photonics [21] and neurophotonics [22].…”

Semi-analytical model for hollow-core anti-resonant fibers

“…Hollow-core optical fibers can be used as hosts for light [1], matter [2], and their interactions [3,4]. In a piece of hollow-core fiber (HCF), the large overlap of laser light and studied matter leads to significant advantages in applications known as lab-on-a-fiber.…”

Feasibility of an optical fiber clock

“…Taking (e k · e B ) = 1, ∆ξ ∼ π∆n λL · L ≪ 1, where ∆n is the difference of the refractive indexes for two orthogonal polarizations and L is the length of the atomic cloud inside the fiber, one can estimate the vector polarizability induced frequency shift uncertainty as δν v,mF ∼ π λL m F ∆nL · 0.22 Hz. For m F = 9/2, ∆n ∼ 10 −7 [21], δν v 9 2 = 3.1 Hz · L λ U ER · 10 −7 . For L = 8.13 cm, U = 10 E R , δν v 9 2 = 0.3 Hz.…”

“…The residual buffer gas pressure in the experiments with cold atoms inside the hollow core fiber [21,51] is P bg ∼ 10 −6 Pa. The collisions of cold Hg atoms with molecular nitrogen N 2 at buffer gas pressure P N2 = 10 −6 Pa, temperature T N2 = 293 K and trapping potential depth U = 180 µK results in a Hg loss rate γ loss = 0.53 1/s.…”

“…Here we analyze the feasibility of a "fiber clock"-a device that holds interrogated clock atoms inside a hollow core optical fiber. The atoms are optically trapped, avoiding collisions with the wall surface [21]. The "fiber clock" is a natural extension of optical lattice clocks [22], which recently reached record levels of estimated fractional inaccuracy at the ≈ 6 × 10 −18 level [23].…”