Showing papers by "Jeffrey H. Shapiro published in 1987"
TL;DR: It is shown that squeezed-state light is generated through forward four-wave mixing in sodium vapor as verified by homodyne detection and optical phase-sensitive noise with a minimum falling 4% below the shot-noise limit was observed.
Abstract: We have generated squeezed-state light through forward four-wave mixing in sodium vapor as verified by homodyne detection. Optical phase-sensitive noise with a minimum falling 4% below the shot-noise limit was observed.
123 citations
TL;DR: Monostatic radar equations are reported for laser-transceiver sensors that employ coherent optical detection over a linear-array photodetector that employs transmitter and receiver antenna patterns on the heterodyne mixing efficiency achieved by each detector element.
Abstract: Monostatic radar equations are reported for laser–transceiver sensors that employ coherent optical detection over a linear-array photodetector. Explicit results are presented illustrating the impact of transmitter and receiver antenna patterns on the heterodyne mixing efficiency achieved by each detector element.
21 citations
TL;DR: In this paper, the authors describe their efforts to observe squeezing, and related nonclassical effects, in three forward four-wave mixing experiments using sodium vapor as a nonlinear medium.
Abstract: We describe our efforts to observe squeezing, and related nonclassical effects, in three forward four-wave mixing experiments using sodium vapor as a nonlinear medium. In a single-beam experiment with homodyne detection, we found optically phase-sensitive noise, which was radio-frequency phase insensitive, in a cw dye-laser beam that had propagated through sodium vapor. The minima of the phase-sensitive noise were always at or above the coherent-state value. In our forward four-wave mixing experiment with probe–conjugate-beam direct detection and correlation, we found that the sodium-vapor interaction produced positive noise correlation between the probe and conjugate beams. The correlation, however, did not exceed the excess noises on these beams, so that a nonclassical behavior was not demonstrated. Finally, our forward four-wave mixing experiment with probe–conjugate-beam combination and homodyne detection did demonstrate the generation of squeezed-state light in our setup. Optically phase-sensitive noise with a minimum falling 4% below the coherent-state level was observed.
16 citations
TL;DR: A theoretical study of the carrier- to-noise ratio and signal-to- noise ratio for an autodyne transceiver is presented and experimental results, obtained with a cw autodyn transceiver, are reported.
Abstract: Optical autodyne detection is a direct detection procedure for measuring relative Doppler frequency shifts using a laser transceiver. A theoretical study of the carrier-to-noise ratio and signal-to-noise ratio for an autodyne transceiver is presented. Experimental results, obtained with a cw autodyne transceiver, are reported. The relative merits of optical autodyne vs optical heterodyne detection are discussed.
13 citations