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Full-Text Articles in Physics
Continuous Phase Amplification With A Sagnac Interferometer, David J. Starling, P. Ben Dixon, Nathan S. Williams, Andrew N. Jordan, John C. Howell
Continuous Phase Amplification With A Sagnac Interferometer, David J. Starling, P. Ben Dixon, Nathan S. Williams, Andrew N. Jordan, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
We describe a phase-amplification technique using a Sagnac interferometer. We monitor the relative phase between two paths of a precisely misaligned interferometer by measuring the average position of a split-Gaussian mode in the dark port. Although we monitor only the dark port, we show that the signal varies linearly with phase and that we can obtain similar sensitivity to balanced homodyne detection. We derive the source of the amplification using classical wave optics.
Optimizing The Signal-To-Noise Ratio Of A Beam-Deflection Measurement With Interferometric Weak Values, David J. Starling, P. Ben Dixon, Andrew N. Jordan, John C. Howell
Optimizing The Signal-To-Noise Ratio Of A Beam-Deflection Measurement With Interferometric Weak Values, David J. Starling, P. Ben Dixon, Andrew N. Jordan, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
The amplification obtained using weak values is quantified through a detailed investigation of the signal-to-noise ratio for an optical beam-deflection measurement. We show that for a given deflection, input power and beam radius, the use of interferometric weak values allows one to obtain the optimum signal-to-noise ratio using a coherent beam. This method has the advantage of reduced technical noise and allows for the use of detectors with a low saturation intensity. We report on an experiment which improves the signal-to-noise ratio for a beam-deflection measurement by a factor of 54 when compared to a measurement using the same beam …
Ultrasensitive Beam Deflection Measurement Via Interferometric Weak Value Amplification, P. Ben Dixon, David J. Starling, Andrew N. Jordan, John C. Howell
Ultrasensitive Beam Deflection Measurement Via Interferometric Weak Value Amplification, P. Ben Dixon, David J. Starling, Andrew N. Jordan, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
We report on the use of an interferometric weak value technique to amplify very small transverse deflections of an optical beam. By entangling the beam’s transverse degrees of freedom with the which-path states of a Sagnac interferometer, it is possible to realize an optical amplifier for polarization independent deflections. The theory for the interferometric weak value amplification method is presented along with the experimental results, which are in good agreement. Of particular interest, we measured the angular deflection of a mirror down to 400
All Optical Waveguiding In A Coherent Atomic Rubidium Vapor, Praveen K. Vudyasetu, David J. Starling, John C. Howell
All Optical Waveguiding In A Coherent Atomic Rubidium Vapor, Praveen K. Vudyasetu, David J. Starling, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
We demonstrate an all optical waveguide imprinted by a low power Laguerre Gaussian control laser beam using a coherent Raman process in warm atomic rubidium vapor. We show that the signal beam propagates with a small spot size over several diffraction lengths. We also show that the coupling efficiency of the signal beam into the waveguide varies linearly with the signal power.
Realization Of An All-Optical Zero To Cross-Phase Modulation Jump, Ryan M. Camacho, P. Ben Dixon, Ryan T. Glasser, Andrew N. Jordan, John C. Howell
Realization Of An All-Optical Zero To Cross-Phase Modulation Jump, Ryan M. Camacho, P. Ben Dixon, Ryan T. Glasser, Andrew N. Jordan, John C. Howell
Mathematics, Physics, and Computer Science Faculty Articles and Research
We report on the experimental demonstration of an all-optical π cross-phase modulation jump. By performing a preselection, an optically induced unitary transformation, and then a postselection on the polarization degree of freedom, the phase of the output beam acquires either a zero or π phase shift (with no other possible values). The postselection results in optical loss in the output beam. An input state may be chosen near the resulting phase singularity, yielding a π phase shift even for weak interaction strengths. The scheme is experimentally demonstrated using a coherently prepared dark state in a warm atomic cesium vapor.