We have performed spectroscopy of a superconducting charge qubit coupled nonresonantly to a single mode of an on-chip resonator. The strong coupling induces a large ac Stark shift in the energy levels of both the qubit and the resonator. The dispersive shift of the resonator frequency is used to nondestructively determine the qubit state. Photon shot noise in the measurement field induces qubit...

Previous theoretical analysis [1] of mode conversion of fast Alfv6n waves (FAW) to ion-Bernstein waves (IBW) neglected poloidal variations of the fields and magnetic shear. Full-wave codes show incident FAW fields focused into multiple poloidal modes near the ion-ion hybrid resonance (IHR)[2]. A new mode conversion model has been constructed including poloidal wavenumbers and poloidal magnetic ...

A typical confocal resonator for THz radiation produced by an FEL will have a waist that is larger than the gap of the undulator. Hence waveguiding is required. Here we consider a resonator consisting of two spherical mirrors and a cylindrical waveguide in between. The radii of curvature for the mirrors are chosen to image the ends of the waveguide onto themselves. We discuss the properties of ...

A typical confocal resonator for THz radiation produced by an FEL will have a waist that is larger than the gap of the undulator. Hence waveguiding is required. Here we consider a resonator consisting of two spherical mirrors and a cylindrical waveguide in between. The radii of curvature for the mirrors are chosen to image the ends of the waveguide onto themselves. We discuss the properties of ...

Evanescent mode cavity resonators are desirable for use in tunable filters due to their tuning sensitivity and high quality factors. This paper proposes a system for monitoring and controlling their resonant frequency and examines the effect of the system on resonator performance. The proposed system controls the resonator over a range from 600 to 700 MHz with unloaded quality factors as high a...

A Hemispherical Resonator Gyro (HRG) is the Coriolis Vibratory Gyro (CVG) that measures rotation angle or angular velocity using Coriolis force acting the vibrating mass. A HRG can be used as a rate gyro or integrating gyro without structural modification by simply changing the control scheme. In this paper, differential control algorithms are designed for a 2-piece HRG. To design a precision c...

We present a new high frequency resonator using a high order mode shape of an annular structure. The basic concept of an annular high frequency resonator (AHFR) is presented and the AHFR is fabricated by using a standard surface micromachining technology. Using theoretical analysis, the resonant frequency of the AHFR was expressed in a simple form. On this basis, a theoretical formula for the A...

We report the direct observation of lasing action from a dynamically localized mode in a microdisk resonator with rough boundary. In contrast to microlasers based on stable ray trajectories, the performance of our device is robust with respect to the boundary roughness and corresponding ray chaos, taking advantage of Anderson localization in angular momentum. The resonator design, although demo...

California Institute of Technology, Pasadena, California 91125. Received 28 June 1975. A simple expression for the beam divergence from a laser oscillating in a high order Gaussian mode can be derived from the properties of the mathematical expressions for these modes.' For simplicity, we first consider a symmetric confocal resonator of spacing b, which contains a laser medium of diameter 2a, a...