Mari Maeda - Academia.edu (original) (raw)
Related Authors
Guru Angad Dev Veterinary And Animal Sciences University
Uploads
Papers by Mari Maeda
Physical Review A, 1984
The suitability of degenerate four-wave mixing (DFWM) as a source of squeezed-state (twophoton co... more The suitability of degenerate four-wave mixing (DFWM) as a source of squeezed-state (twophoton coherent state) light is investigated, both theoretically and experimentally. In previous semiclassical theory, which neglected pump quantization and loss in the nonlinear medium, Yuen and Shapiro [Opt. Lett. 4, 334 (1979)] showed that such states would be generated by 50%-50% combination of the transmitted probe (TP) and the phase-conjugate (PC) output beams of DFWM. Here the effects of quantum fluctuations in the amplitudes and phases of the pump beams are calculated in a traveling-wave finite-interaction-length DFWM configuration. It is shown that in the limit of strong pump beams and weak nonlinear coupling, the classical-pumps assumption of Yuen and Shapiro is valid. With use of this assumption, loss in the nonlinear medium is incorporated into the model by coupling the interacting modes to a set of reservoir modes. It is shown that loss presents an absolute limit on the degree of squeezing that can be achieved with DFWM. Also, for comparison with experimental work, the photoelectron statistics of the TP, PC, and 50%-50% combination modes are calculated for lossy DFWM; significant deviations are found from the predictions for lossless operation. Quantum-noise measurements on the PC and TP beams generated in sodiumvapor DFWM are described. The mixer is pumped and probed by the nearly transform-limited pulses produced by a continuous-wave-oscillatorpulse-amplifier chain dye laser at 589 nm wavelength. The normalized second-factorial moment g2 of the PC and TP beams is determined from photoelectron-counting measurements. Inability to simultaneously achieve high DFWM reflectivity and acceptably low scattered-plus-fluorescent background, coupled with low photomultiplier quantum efficiency, restrict the experiment to a DFWM regime wherein theory predicts Poisson statistics. Experimental g2 values corroborate this prediction, indicating that systematic and excess noises have been eliminated. No attempt was made to measure the quantum statistics of the 50%-50% combination mode.
Coherence and Quantum Optics V, 1984
Degenerate four-wave mixing (DFWM) has been identified by Yuen and Shapiro1 as a possible way to ... more Degenerate four-wave mixing (DFWM) has been identified by Yuen and Shapiro1 as a possible way to generate two-photon coherent state (TCS) light. Their model, although quantum mechanically consistent, quantized only the probe waves; the pump waves and the medium were treated classically. Furthermore, other real effects that sometimes hamper DFWM experiments, such as loss and self focusing, were ignored. Because the key non-classical characteristic of TCS light, its quadrature noise squeezing, is destroyed by excessive loss and fluctuations, it is desirable to include these effects in analyzing a DFWM TCS-generation experiment. In this paper, we extend the model of Yuen and Shapiro to include the effects of pump quantum noise, and loss in the four-wave mixer. The two problems will be treated separately.
Physical Review A, 1985
We have observed optical phase-sensitive noise in homodyne detection of a cw light beam which has... more We have observed optical phase-sensitive noise in homodyne detection of a cw light beam which has propagated through sodium vapor near the D lines. Although at present the minimum noise is at or above the vacuum-state quantum limit due to zero-point fluctuations, nevertheless its phase behavior is like that of a squeezed state. Our observations are consistent both with the predictions of the quantum-mechanical theory of degenerate four-wave mixing and the theory of multiatom resonance fluorescence in. the forward direction.
Physical Review A, 1984
The suitability of degenerate four-wave mixing (DFWM) as a source of squeezed-state (twophoton co... more The suitability of degenerate four-wave mixing (DFWM) as a source of squeezed-state (twophoton coherent state) light is investigated, both theoretically and experimentally. In previous semiclassical theory, which neglected pump quantization and loss in the nonlinear medium, Yuen and Shapiro [Opt. Lett. 4, 334 (1979)] showed that such states would be generated by 50%-50% combination of the transmitted probe (TP) and the phase-conjugate (PC) output beams of DFWM. Here the effects of quantum fluctuations in the amplitudes and phases of the pump beams are calculated in a traveling-wave finite-interaction-length DFWM configuration. It is shown that in the limit of strong pump beams and weak nonlinear coupling, the classical-pumps assumption of Yuen and Shapiro is valid. With use of this assumption, loss in the nonlinear medium is incorporated into the model by coupling the interacting modes to a set of reservoir modes. It is shown that loss presents an absolute limit on the degree of squeezing that can be achieved with DFWM. Also, for comparison with experimental work, the photoelectron statistics of the TP, PC, and 50%-50% combination modes are calculated for lossy DFWM; significant deviations are found from the predictions for lossless operation. Quantum-noise measurements on the PC and TP beams generated in sodiumvapor DFWM are described. The mixer is pumped and probed by the nearly transform-limited pulses produced by a continuous-wave-oscillatorpulse-amplifier chain dye laser at 589 nm wavelength. The normalized second-factorial moment g2 of the PC and TP beams is determined from photoelectron-counting measurements. Inability to simultaneously achieve high DFWM reflectivity and acceptably low scattered-plus-fluorescent background, coupled with low photomultiplier quantum efficiency, restrict the experiment to a DFWM regime wherein theory predicts Poisson statistics. Experimental g2 values corroborate this prediction, indicating that systematic and excess noises have been eliminated. No attempt was made to measure the quantum statistics of the 50%-50% combination mode.
Coherence and Quantum Optics V, 1984
Degenerate four-wave mixing (DFWM) has been identified by Yuen and Shapiro1 as a possible way to ... more Degenerate four-wave mixing (DFWM) has been identified by Yuen and Shapiro1 as a possible way to generate two-photon coherent state (TCS) light. Their model, although quantum mechanically consistent, quantized only the probe waves; the pump waves and the medium were treated classically. Furthermore, other real effects that sometimes hamper DFWM experiments, such as loss and self focusing, were ignored. Because the key non-classical characteristic of TCS light, its quadrature noise squeezing, is destroyed by excessive loss and fluctuations, it is desirable to include these effects in analyzing a DFWM TCS-generation experiment. In this paper, we extend the model of Yuen and Shapiro to include the effects of pump quantum noise, and loss in the four-wave mixer. The two problems will be treated separately.
Physical Review A, 1985
We have observed optical phase-sensitive noise in homodyne detection of a cw light beam which has... more We have observed optical phase-sensitive noise in homodyne detection of a cw light beam which has propagated through sodium vapor near the D lines. Although at present the minimum noise is at or above the vacuum-state quantum limit due to zero-point fluctuations, nevertheless its phase behavior is like that of a squeezed state. Our observations are consistent both with the predictions of the quantum-mechanical theory of degenerate four-wave mixing and the theory of multiatom resonance fluorescence in. the forward direction.