The generation of photon-number squeezed states or sub-Poissonian light using semiconductor devices is especially attractive because of its simple experimental configuration, small energy consumption, and the possibil...
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The generation of photon-number squeezed states or sub-Poissonian light using semiconductor devices is especially attractive because of its simple experimental configuration, small energy consumption, and the possibility of large amplitude noise reduction by using high quantum efficiency devices. Recently, 3 dB squeezing at liquid nitrogen temperature and 80 MHz (3 dB roll-off bandwidth) squeezing at room temperature were reported by using a light-emitting diode. In this paper, we demonstrate over 200 MHz squeezing at 48 K.
In nondegenerate FWM (NDFWM) experiments employing spectrally narrower pulses, we can limit the FWM processes to specific ones. Thus, NDFWM measurements will give new insights on the excitonic dynamics. In our previou...
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In nondegenerate FWM (NDFWM) experiments employing spectrally narrower pulses, we can limit the FWM processes to specific ones. Thus, NDFWM measurements will give new insights on the excitonic dynamics. In our previous study using spectrally-resolved DFWM techniques on a self-organized quantum-well material, (C/sub 6/H/sub 13/NH/sub 3/)/sub 2/PbI/sub 4/, it has been shown that two exciton states, including biexciton and weakly interacting two-exciton state, play an important role in FWM processes. However, the signals arising from various two-exciton states overlapped spectrally with each other in DFWM experiments. In this study, we have employed NDFWM techniques on (C/sub 6/H/sub 13/NH/sub 3/)/sub 2/PbI/sub 4/ to observe the contributions of two-exciton states separately.
Dipole resonant x-ray scattering from ordered Mn 3d orbitals in LaMnO3 has been observed near the Mn K-absorption edge. The polarization of the scattered photons is rotated from σ to π′ and the azimuthal angle depe...
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Dipole resonant x-ray scattering from ordered Mn 3d orbitals in LaMnO3 has been observed near the Mn K-absorption edge. The polarization of the scattered photons is rotated from σ to π′ and the azimuthal angle dependence shows a characteristic twofold symmetry. A theory for the resonant scattering mechanism has been developed by considering the splitting of the Mn 4p levels due to the Mn 3d orbital ordering. The order parameter of the orbital ordering decreases above the Néel temperature ( TN=140K) and disappears at TO=780K, concomitant with a structural phase transition.
Summary form only given. Among a variety of schemes for nonclassical light generation, the generation of sub-Poissonian photon-states with semiconductor lasers or light-emitting-diodes (LEDs) has been attracting much ...
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Summary form only given. Among a variety of schemes for nonclassical light generation, the generation of sub-Poissonian photon-states with semiconductor lasers or light-emitting-diodes (LEDs) has been attracting much attention, primarily from engineering point of view. In this talk, we shall present our experimental results, manifesting substantial noise suppression of output photon fluxes below standard quantum limit (SQL) level from a single LED surprisingly without recourse to high-impedance circuit at room temperature. The observed squeezing is interpreted semiquantitatively in terms of our new model including effects of microscopic backward pump process.
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