Characterization of frequency stability in electromagnetically induced transparency-based atomic clocks using a differential detection scheme

Abstract

We investigate a recently proposed scheme for differential detection of the magneto-optical rotation effect and its application to electromagnetically induced transparency (EIT) atomic clocks [1]. This scheme utilizes a linearly polarized bichromatic laser field that is EIT-resonant with alkali atoms. The results of our study reveal that the suppression of the laser noise can substantially improve the signal-to-noise ratio in EIT atomic clocks. Our preliminary results demonstrate an order of magnitude improvement in clock stability under some conditions when incorporating the differential detection scheme.

Electromagnetically induced transparency in Λ-systems of 87Rb atom in magnetic field

“…The electromagnetically induced transparency (EIT), a quantum interference phenomenon, is related to increase in the transmission of a weak probe beam in presence of a strong coupling beam [1,2]. Since the conception of EIT, several applications of this phenomenon have attracted attention of researchers which include applications in optical communication network [3], optical switching devices [4,5], manipulation of group velocity of light and light storage [6][7][8][9][10], tight laser frequency locking [11], high resolution spectroscopy [12,13], atomic clocks [14], quantum information processing [15,16], highly sensitive magnetometery [17][18][19][20][21][22], velocimetry [23], etc.…”

Electromagnetically induced absorption scheme for vapor-cell atomic clock

“…At the contrary of the CPT or EIT [30] approaches involving the detection of dark resonances, the exploitation of coherently driven bright resonances has been rarely explored for the development of atomic clocks. In [31], a bright three-photon N-type resonance has been used on the Rb D 1 line for the demonstration of an atomic clock.…”

Observation of dual electromagnetically induced transparencies in cold $^{87}Rb$ atoms

“…EIT is an effect of quantum interference that modifies the optical property of an atomic medium for a weak probe field in presence of another strong coupling field [1]. The fascinating applications of EIT includes slow light propagation [2][3][4], optical switching [5,6], precise atomic clocks [7], tight laser frequency locking [8,9], precise measurement of optical frequency [10], non-linear optical process [11,12], etc. The basic atomic systems that can exhibit EIT effect are Λ- [13][14][15][16], ladder- [17][18][19] and vee-system [20,21].…”