This is the first report of the use of a hand-held 1064 nm Raman spectrometer combined with red-shifted surface-enhanced Raman scattering (SERS) nanotags to provide an unprecedented performance in the short-wave infrared (SWIR) region. A library consisting of 17 chalcogenopyrylium nanotags produce extraordinary SERS responses with femtomolar detection limits being obtained using the portable in...

The recently upgraded AURIGA detector and the LIGO observatory were simultaneously acquiring data for the first time in a 2-weeks period during the LIGO S3 run. This coincidence run motivated a collaborative effort to test search methods for gravitational wave bursts on real data. The adopted method uses broad-band cross correlation for the LIGO interferometers triggered by AURIGA events in the...

Holographic interferometry with a phase-modulated reference beam is used to visualize a progressive ultrasonic wave in the interior of a transparent medium. The medium is illuminated with sheetlike light, and the light scattered from the plane of the light sheet is recorded in the hologram. The ultrasonic field on the plane is obtained from the reconstructed image, which provides the equiphase ...

[12] T. L. ,Fhang, “Limit cycles in a two-dimensional first-order digital y;lt; IEEE Trans. Circuits Syst., vol. CAS-24, pp. 15-19, Jan. + [13] A. Fettweis, “Pseudopassivity, sensitivity and stability of wave digital filters,” IEEE Trans. Circuit Theory, vol. CT-19, pp. 668673, Nov. 1972. [ 141 ?, “Realizability of digital filter networks,” Arch. Elektr. Alfred Fettweis (M’56-SM’62-F’75), for a...

A continuous-wave cavity ring-down spectrometer has been built for precise determination of absolute frequencies of Doppler-broadened absorption lines. Using a thermo-stabilized Fabry-Pérot interferometer and Rb frequency references at the 780 nm and 795 nm, 0.1 - 0.6 MHz absolute frequency accuracy has been achieved in the 775-800 nm region. A water absorption line at 12579 cm(-1) is studied t...

Solid state amplifiers are being used for linear accelerators at TRIUMF which are either being upgraded or under development. The Radioactive Ion Beam (RIB) facility at ISAC II which is being upgraded with additional 20 quarter wave superconducting bulk niobium cavities will employ twenty 141 MHz solid state amplifiers. A 650 MHz solid state amplifier for electron gun development and an 1.3 GHz...

The first direct measurement of gravitational waves by the LIGO and Virgo collaborations has opened up new avenues to explore our Universe. This white paper outlines challenges gains expected in wave searches at frequencies above LIGO/Virgo band, with a particular focus on Ultra High-Frequency Gravitational Waves (UHF-GWs), covering MHz GHz range. absence known astrophysical sources this freque...

The properties of all-optical phase-coherent frequency division by 3, based on a self-phase-locked continuous-wave ~cw! optical parametric oscillator ~OPO!, are investigated theoretically and experimentally. The frequency to be divided is provided by a diode laser master-oscillator power-amplifier system operated at a wavelength of 812 nm and used as the pump source of the OPO. Optical self-pha...

Determinations of shear wave speeds of sound and attenuation coefficients are reported for soft tissues, a silicone rubber reference material, and a gel used in manufacturing ultrasonically tissue-mimicking materials. Fresh bovine tissues were investigated, including calfskin, liver, cardiac muscle, and striated muscle. Because of the very large shear wave attenuation coefficients, reasonably a...

A simple method for imaging ultrasonic fields in clear media is introduced. A modulated laser source is used to project the ultrasonic field onto a CCD camera. By use of the source-synchronized lock-in detection scheme, 2D images of the amplitude and phase distributions can be determined simultaneously. This technique is experimentally demonstrated with a 1-MHz and a 3.5-MHz ultrasonic transduc...