Browsing by Author "RETAMAL, JC"

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    DIFFUSION-PROCESSES ASSOCIATED TO A LASER MODEL
    (AMER INST PHYSICS, 1992) REBOLLEDO, R; RETAMAL, JC; SAAVEDRA, C
    A diffusion process is constructed as a model for the electromagnetic field in a laser. The process is characterized by means of a Martingale problem of Nelson's type, under a finite entropy assumption.
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    EFFECT OF FINITE ATOMIC LIFETIMES ON THE GENERATION OF NONCLASSICAL STATES IN MICROMASERS
    (1993) ROA, L; RETAMAL, JC; SAAVEDRA, C
    We study the effect of finite atomic lifetimes on a micromaser from temporal evolution. A stream of finite-lifetime two-level atoms is injected inside a cavity in a coherent superposition of their upper and lower levels. We study the effect of the atomic decay on the generation of quasipure states of the inner electromagnetic field. First, we study the stationary photon number distribution when the atoms are injected in their upper level. We compare our results with previous calculations by Zhu, Wang, and Fearn [Phys. Rev. A 44, 737 (1991)]. We find that quasinumber states can be generated for a long time, in a range of physical parameters that allows their experimental realization. Second, we investigate the effect of finite atomic lifetimes on the generation of cotangent states, and we study their squeezing properties.
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    GENERATION OF HIGHLY SQUEEZED STATES IN A 2-PHOTON MICROMASER
    (1992) ORSZAG, M; RAMIREZ, R; RETAMAL, JC; ROA, L
    We consider a lossless two-photon micromaser with atomic polarization. We find that for particular values of the atomic flight time, the field evolves to a pure state which can be made of a superposition of even-photon-number states or odd-number states. These states approach to a perfectly squeezed state as the upper limit of the "trap" increases.
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    PHOTON NUMBER NOISE-REDUCTION IN A 2-PHOTON MICROMASER
    (1990) ORSZAG, M; RETAMAL, JC
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    PHOTON STATISTICS IN THE POLARIZATION CEL
    (1991) ORSZAG, M; RETAMAL, JC
    In this work we find the photon statistics for the polarization CEL. The master equation, which couples diagonal and off diagonal matrix elements due to the initial atomic coherence, is solved by using the well known Scully-Lamb ansatz. The possible solutions and stability of the steady state photon number are investigated. Typical bistability behavior is found for a small range of the atomic coherence parameter.
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    REDUCTION OF PHOTON-NUMBER FLUCTUATIONS IN 2-PHOTON LASERS
    (1991) ORSZAG, M; RETAMAL, JC
    We analyze the effects of pump statistics on degenerate and nondegenerate two-photon lasers. We find that, although the steady-state mean photon numbers are not affected by pump statistics, there is an interesting reduction in the photon-number fluctuations, both in degenerate and nondegenerate two-photon lasers when the pump statistics is regular (p = 1), as compared to the Poissonian case (p = 0).
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    TRAPPING STATES IN A 3-LEVEL LAMBDA-SYSTEM
    (1992) RETAMAL, JC; ROA, L; SAAVEDRA, C
    We study the temporal evolution and the stationary regime of an electromagnetic-field mode interacting with three-level LAMBDA-type atoms in a lossless microwave cavity. We find that under certain conditions the field evolves to the recently defined tangent or cotangent states [J. J. Slosser and P. Meystre, Phys. Rev. A 41, 3867 (1990)]. In particular, in this system number states can be generated for any value of the atomic-upper-level population. In addition, a strong squeezing in the quadrature fluctuations is found.