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Effects of field fluctuations, losses, and aberrations on the sensitivity of a Michelson GW antenna using squeezed radiation (Articolo in rivista)

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Effects of field fluctuations, losses, and aberrations on the sensitivity of a Michelson GW antenna using squeezed radiation (Articolo in rivista) (literal)

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Fiorentino, M.; Maddalena, P.; Man'ko, M.A.; Man'ko, V.I.; Porzio, A.; Romano, R.; Solimeno, S.; Zaccaria, F. (1998)
Effects of field fluctuations, losses, and aberrations on the sensitivity of a Michelson GW antenna using squeezed radiation
in Journal of Russian laser research; Plenum Press, New York (Stati Uniti d'America)
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Fiorentino, M.; Maddalena, P.; Man'ko, M.A.; Man'ko, V.I.; Porzio, A.; Romano, R.; Solimeno, S.; Zaccaria, F. (literal)

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1. Univ Naples Federico II, Dipartimento Sci Fis, Naples, Italy 2. Ist Nazl Fis Mat, Unita Napoli, Complesso Univ Monte St Angelo, Naples, Italy 3. Russian Acad Sci, PN Lebedev Phys Inst, Moscow 117924, Russia 4. Ist Nazl Fis Nucl, Sez Napoli, Complesso Univ Monte St Angelo, I-80126 Naples, Italy 5. VIRGO Project, I-80126 Naples, Italy (literal)

Titolo

Effects of field fluctuations, losses, and aberrations on the sensitivity of a Michelson GW antenna using squeezed radiation (literal)

Abstract

The sensitivity of an interferometric gravitational wave (GW) antenna operating above a few hundred Hertz is shot-noise limited. Sub-shot-noise sensitivity can be achieved by superimposing squeezed light on the laser field. The benefits of this approach are reduced in nonideal interferometers having fringe visibility less than unity, as pointed out by Gea-Banacloche and Leuchs and recently discussed by Chickarmane. Here, we consider an interferometer described by a set of coefficients V-l((k)), V-sq((k)), V-lsq((k)) depending on the misalignment, mismatching, and aberrations of the optical systems, as well as on the asymmetry of the beam splitter and the two-arm losses. Due to the presence of terms proportional to the product of laser times squeezed fields, we have taken into account the amplitude fluctuations of a(l). A simple model of the squeezed vacuum light, produced by a degenerate optical parametric oscillator (OPO), is used for calculating the dependence of the spectral density of the output of a GW antenna on the fluctuations of the OPO-cavity resonance frequency, the pump amplitude fluctuation, and the nonlinear-crystal-temperature drift. A set of figures eta(sq+/-) and r(lsq+/-)((2)) are introduced for describing the effects of the amplitude fluctuations and the relative linewidth gamma(la) on the spectral density of the quadrature phase operator X = a(l)a(sq)dagger + h.c. (literal)

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