The frequency of the dark resonance in coherent population trapping experiments has been measured as a function of the degree of ellipticity and the intensity of the probe light. The results have been used to find the quantum limit of sensitivity of an optical magnetometer based on the nonlinear Faraday effect.
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We study experimentally the nonlinear mode coupling between circular polarizations in a vertical-cavity surface-emitting laser (VCSEL) device developed for spin injection. The specific experimental arrangement that includes a Faraday rotator enables laser oscillation on left-circular or right-circular polarization, by adjusting the cavity losses. We show the simultaneous oscillation of both polarizations never occurs, proving that the Lamb coupling constant is very close to 1 in this VCSEL device, a situation that is ideal for spintronic applications.
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International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
We have developed a terahertz (THz) nonlinear spectrometer at low temperatures (1.5-300 K) and under high magnetic fields (up to 10 T) by combining the laser-driven table-top intense THz source with a superconducting magnet. The strong-field THz pump pulse was generated from LiNbO3 crystal using the tilted-pulse-front technique and tightly focused into the center of the magnet by an off-axis parabolic mirror and a THz lens.
View Article and Find Full Text PDFA simple electrical circuit model for impedance spectroscopy with cochlear implant electrodes.
Hear Res
November 2024
Hannover Medical School, Department of Otolaryngology/NIFE and Cluster of Excellence "Hearing4all", Stadtfelddamm 34, Hannover 30625, Germany. Electronic address:
Article Synopsis
- Cochlear implants restore hearing but face issues like current spread and reduced frequency resolution from tissue growth around the electrodes.
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Nat Commun
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