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Application of an atomic magnetometer based on nonlinear magneto-optical rotation(NMOR) was studied. We have observed the NMOR signals in 87Rb D1 line using the the Rb vapor cell coated with paraffin. The paraffin coated vapor cell lead to double structured features in the NMOR signal which have different slope value of 0.193 mrad/mG and 2.23 mrad/mG with laser power 400 muW, respectively.
Chinese area positioning system (abbreviated as CAPS) has its own special system time called CAPST (China area positioning system time). To realize the function of time service, CAPST must be precisely traceable to UTC (NTSC). The very important process when CAPS is to be traced to UTC (NTSC) is that the transmission delay of one pulse per second (1 pps) though phase stable cable from the UTC (NTSC)...
The success in cooling and trapping atomic gases to the point of quantum degeneracy has prompted a quest to create ultracold molecular gases. Atomic techniques can not be applied to molecular gases due to their richer internal structure. Effort has been applied to converting ultracold atoms to ultracold molecules. This should be done without the use of spontaneous decay to attain the coldest possible...
In our experiment, we study and intend to manipulate the interaction between the two species viz. rubidium (Rb) and caesium (Cs) at ultracold temperatures. We propose to explore the world of many body physics and small particle physics by inserting a few Cs atoms into a Rb condensate. Our experimental set up consists of a double MOT system, with a magnetic trap in the QUIC configuration. The Rb atoms...
We present the quadrature and polarization squeezing generated by a sub-threshold optical parametric oscillator (OPO) resonant to rubidium D1 line and pumped by a frequency-doubled diode laser. We demonstrate here a technique to eliminate the effects of laser phase noise on quadrature squeezing. The technique uses cavity stabilization of the laser frequency, in combination with a carefully chosen...
In this work, the authors proposed a novel state selective atom localization and patterning scheme named subwavelength localization via adiabatic passage (SLAP) that consists in coupling two partially overlapping and spatially structured laser fields to three internal levels of the matter wave yielding state-selective localization at those positions where the adiabatic passage process does not occur...
The aim of this paper is to realize excitation in a small volume, development of diagnostic methods for cold Rydberg atoms, spectroscopy of the microwave transitions between Rydberg states in the presence of the magneto-optical trap (MOT) quadrupole magnetic field, as well as observation of dipole-dipole interaction of a small number of Rydberg atoms.
An atom-cavity composite formed by one atom coupled to a single high-Q mode of a cavity is one of the essential systems in the study of cavity quantum electrodynamics, with applications in quantum information processing. This system is also of a considerable interest for the study of non-Hermitian Hamiltonian and quasi-eigenmode topology such as the existence of an exceptional point; the atom-cavity...
The authors report on the direct observation of a higher-order dressed state in the transmission spectrum of an optical cavity QED system. A single trapped rubidium atom is coupled to the mode of a high-finesse optical resonator. When the system is probed at low input power, only single photon transitions are driven and the transmission spectrum shows the normal modes. By increasing the probe power,...
This work considers an atom-light interface consisting of pulses of polarized light that interacts with an ensemble of 106 cold 87Rb in dipole trap. Measurements of polarization changes in the light is used in probing the atomic state. In such polarization-based atom-light interface, a Hamiltonian nonlinear in the Stokes operators can be produced through optical nonlinearities. This work investigates...
This study experimentally demonstrates laser cooling of rubidium atoms subjected to 500 bar of buffer gas pressure based on the collisional redistribution of fluorescence. The frequent collisions in the ultradense gas transiently shift a far red detuned laser beam into resonance, while spontaneous decay occurs close to the unperturbed atomic resonance frequency. In a proof of principle experiment,...
The results on accurate measurement of the absolute frequency of the 87Rb hyperfine ground-state transition in the NPL Rb fountain frequency standard is presented.To decrease the density-dependent shifts by an order of magnitude, it is proposed to operate the fountain in the velocity-chirped quasi-continuous regime, which combines the ideas of the juggling and the quasi- continuous fountains.
Shimizu et al. demonstrated an alternative of the usual six beam magneto-optical trap (MOT), using four independent beams in a tetrahedral configuration. This paper demonstrates a novel version of the four beam MOT using a triplet of mirrors to split and steer an incoming beam into three parts such that all four beams cross in the correct configuration. In the usual pyramid configuration, the MOT...
This work presents a progress on the interaction of cold Rb atoms with magnetic fields from domain walls in nanowires. Micromagnetic simulations show that nanowires can be utilized to create atom traps with MHz-regime frequencies. In addition, this study explores the use of domain walls in nanowires to create an atom mirror that can be switched on and off under pulsing external fields.
We report the results of mathematical modeling the frequency stability for three types of rubidium gas cell frequency standards : with continuous and pulse laser pumping and with coherent population trapping (CPT). A critical point for using laser pumping in RFS which defines essentially the frequency stability is the influence of laser emission's frequency fluctuations. The effect of these fluctuations...
This paper presents the achievement of the dual atom clock operation of the FO2 double fountain at LNE-SYRTE with both Cs and Rb atoms launched simultaneously. We describe how it works, metrological characteristics and results of the first Rb/Cs frequency measurement campaign performed with FO2 as a dual atom clock, among which a new absolute frequency determination of the 87Rb hyperfine frequency.
In this paper, a unique physics package using slotted-tube cavity for rubidium atomic frequency standard has been described, including its structure, characteristics and performances. Due to the advantages of high cavity Q factor, large microwave filling factor, stable light intensity and so on, the physics package has obtained a high signal-to-noise ratio. The test results suggest that RAFS using...
We present an atomic clock based on the interrogation of magnetically trapped 87Rb atoms. Two photons, in the microwave and radiofrequency domain excite the clock transition. At a magnetic field of 3.23 G the clock transition from |F=1, mF=-1rang to |F=2, mF=1rang is 1st order insensitive to magnetic field variations. Long Ramsey interrogation times can thus be achieved, leading to a projected clock...
Numerous commercial and military applications utilize precision quartz oscillators and/or atomic frequency standards to generate super-accurate frequencies and time signals crucial to system performance. Examples where precise time and frequency is essential are telecommunications, drilling for natural resources, synchronizing railroads, satellite ground stations, laboratory standards and various...
We characterize the diffusion and redistribution processes that Rb atoms undergo on the inner silica surface of hollow-core photonic bandgap fibers by investigating the dynamics of fiber-transmission and light-induced atomic desorption.
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