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Nonclassical Features of Intra-Cavity and Transmitted Fields in a Coherently-Pumped Correlated-Emission Laser with Injected Thermal Light†

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Journal of Russian Laser Research Aims and scope

Abstract

We discuss effects of phase fluctuations and thermal light on the entanglement, squeezing, and intensity of the two-mode intra-cavity and transmitted fields generated by a coherently-pumped correlated-emission laser. The three-level atoms are initially prepared in the ground and excited states with equal probabilities, and a classical pumping field incoming from an external source via the input mirror induces the atomic coherence accountable for nonclassical features in the quantum system. In addition, the laser cavity contains a nondegenerate parametric amplifier and is seeded by a two-mode thermal light. We investigate the entanglement, applying the inseparability criterion for a continuous variable system by Duan et al. We find that the phase fluctuation significantly depletes the amount of squeezing and hence entanglement in the weak pumping regime. However, the classical pumping field completely overcomes the effect of phase fluctuations in the strong pumping regime so that the intra-cavity and transmitted entanglement and squeezing of the two-mode radiation remain strong in this regime. Moreover, the maximum achievable amount of squeezing and entanglement of transmitted fields in the weak and strong pumping regimes is unaffected by the thermal decoherence. On the other hand, phase fluctuations as well as thermal noise amplify the intensity of the intra-cavity and transmitted fields.

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Authors and Affiliations

  1. Department of Physics, Jimma University, P.O. Box 378, Jimma, Ethiopia

    Chimdessa Gashu Feyisa, Ebisa Mosisa & Abebe Tuguma

  2. Department of Physics, Madda Walabu University, P.O. Box 247, Bale Robe, Ethiopia

    Feyissa Abate

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  1. Chimdessa Gashu Feyisa
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  2. Ebisa Mosisa
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  3. Abebe Tuguma
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  4. Feyissa Abate
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Correspondence to Chimdessa Gashu Feyisa.

Additional information

†This manuscript was submitted as a regular paper but the Editorial Board of Journal of Russian Laser Research decided to publish it in this Special issue dedicated to the memory of Dr. Vladimir A. Andreev, since the manuscript contains interesting results related to Andreev’s scientific activity; this fact was also pointed out by referees, who are simultaneously the authors of this issue.

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Feyisa, C.G., Mosisa, E., Tuguma, A. et al. Nonclassical Features of Intra-Cavity and Transmitted Fields in a Coherently-Pumped Correlated-Emission Laser with Injected Thermal Light†. J Russ Laser Res 43, 104–123 (2022). https://doi.org/10.1007/s10946-022-10028-3

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  • DOI: https://doi.org/10.1007/s10946-022-10028-3

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