Laser phase fluctuations in a four-level atomic system in N-configuration |
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Authors: | N Singh R D’Souza QV Lawande BN Jagatap |
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Institution: | 1. Homi Bhabha National Institute, Bhabha Atomic Research Centre, 400 085, Mumbai, India 2. Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, 400 085, Mumbai, India
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Abstract: | We discuss here the effect of laser phase fluctuations on coherent spectroscopy of four-level N-system interacting with a trichromatic radiation field of frequencies Ω i , (i = 1?3). The laser phase variables are described by the Wiener-Levy diffusion process to specify the bandwidths (Γ i ) and cross-correlations (Γ ij ) that may exist between pairs of laser fields. A general formalism based on the master equation and theory of multiplicative stochastic processes is developed and used to study three-photon and (2+1)-photon absorptive resonances in model N-system of 40Ca+ ion. It is observed that the resonances are suppressed or broadened by all Γ i ,(i = 1?3), while their revival is dependent only on Γ 12 and Γ 23, and yet the revival is only partial even when the relevant fields are critically correlated. In contrast Γ 13 is observed to deteriorate the absorptive resonances. The distinctive features of the steady state and time dependent behavior of the system under three-photon and (2 + 1)-photon resonance conditions and for fluctuating fields are discussed. |
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