Atomic clocks and coherent population trapping: Experiments for undergraduate laboratories
نویسندگان
چکیده
We demonstrate how to construct and operate a simple and affordable apparatus for producing coherent effects in atomic vapor and for investigating their applications in time-keeping and magnetometery. The apparatus consists of a vertical cavity surface emitting diode laser directly current-modulated using a tunable microwave oscillator to produce multiple optical fields needed for the observation of coherent population trapping. This effect allows very accurate measurement of the transition frequency between two ground state hyperfine sublevels, which can be used to construct a coherent population trapping-based atomic clock.
منابع مشابه
Modulation-induced frequency shifts in a coherent-population-trapping-based atomic clock
We investigate systematic errors associated with a common modulation technique used for phase-sensitive detection of a coherent-population-trapping (CPT) resonance. In particular, we show that modification of the CPT resonance line shape due to the presence of off-resonant fields leads to frequency shifts that may limit the stability of CPT-based atomic clocks. We also demonstrate that an alter...
متن کاملModulation induced frequency shifts in a CPT-based atomic clock
We investigate systematic errors associated with a common modulation technique used for phase sensitive detection of a coherent population trapping (CPT) resonance. In particular, we show that modification of the CPT resonance lineshape due to the presence of off-resonant fields leads to frequency shifts which may limit the stability of CPT-based atomic clocks. We also demonstrate that an alter...
متن کاملStudy of lin ‖ lin CPT for application in vapour cell atomic
1 Abstract We evaluate the use of Coherent Population Trapping (CPT) excited with parallely polarized laser fields in vapour cell atomic clocks. We study the resonance shape, the discriminator slope and signal-to-noise ratio as a function of relevant parameters such as the laser frequency detuning and the applied magnetic field. We show that a stability of 6 · 10 −12 τ −1/2 may be reached in a ...
متن کاملVCSELs for Atomic Clock Demonstrators
Miniaturized atomic clocks (MACs) [1] are key elements for many applications such as communication systems, remote sensing, and global positioning. Such clocks use the principle of all-optical coherent population trapping (CPT) excitation which does not require a microwave cavity and VCSELs are the ideal light sources. They must feature strictly polarization-stable single-mode emission, have a ...
متن کاملQuantum state engineering and precision metrology using state-insensitive light traps.
Precision metrology and quantum measurement often demand that matter be prepared in well-defined quantum states for both internal and external degrees of freedom. Laser-cooled neutral atoms localized in a deeply confining optical potential satisfy this requirement. With an appropriate choice of wavelength and polarization for the optical trap, two electronic states of an atom can experience the...
متن کامل