A5010047027- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Semiconductor Quantum Structures and Devices
- Advanced Fiber Laser Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- Laser-Matter Interactions and Applications
- Schizophrenia research and treatment
- Terahertz technology and applications
- Photorefractive and Nonlinear Optics
- Radio Frequency Integrated Circuit Design
- Force Microscopy Techniques and Applications
- Solid State Laser Technologies
- Near-Field Optical Microscopy
- Global Health Care Issues
- Economic Growth and Productivity
- Laser Design and Applications
- Advanced Photonic Communication Systems
- Advanced Neuroimaging Techniques and Applications
- Gyrotron and Vacuum Electronics Research
- Microwave Engineering and Waveguides
- Functional Brain Connectivity Studies
- Optical Network Technologies
- Advanced Optical Sensing Technologies
- Mechanical and Optical Resonators
- Treatment of Major Depression
Georgia State University
2025
University of Washington
2021-2024
Douglas Mental Health University Institute
2001-2023
Harvard University
1985-2023
Harvard Global Health Institute
2009-2022
National Bureau of Economic Research
1991-2021
McGill University Health Centre
2021
McGill University
1985-2020
University of Göttingen
2020
University of Hohenheim
2020
In a double-blind study, 135 inpatients with diagnosis of chronic schizophrenia were randomly assigned to 8 weeks treatment one six parallel treatments: risperidone (a new central 5-hydroxytryptamine2 and dopamine D2 antagonist), 2, 6, 10, 16 mg/day; haloperidol, 20 or placebo, after single-blind placebo washout period. Doses increased in fixed increments up maintenance dose reached 1 week. On the Clinical Global Impression-Severity Illness Improvement, all active medications superior except...
Direct electrooptic sampling is a noncontact optical-probing technique for measuring with picosecond time resolution the voltage waveforms at internal nodes within GaAs integrated circuits. The factors contributing to system bandwidth, sensitivity, spatial resolution, and circuit perturbation are discussed, as requirements realistic testing of analog digital devices. Measurements high-speed circuits presented, including time-domain waveform timing measurements frequency-domain transfer...
Heterodyne detection of the light from two slave lasers injection locked to FM sidebands a modulated master laser is used generate narrowband microwave signal at 10.5 GHz.
A new type of light modulator, the deformable grating based on electrically controlling amplitude a micromachined phase is described. Mechanical motion one quarter wavelength sufficient for switching in this device. The small mechanical allows use structures with high resonance frequencies. We have developed modulator bandwidth 1.8 MHz and voltage 3.2 V demonstrated modulation 16 dB contrast. Smaller devices bandwidths as much 6.1 predicted voltages less than 10 were also fabricated.
Operation of a new nonlinear backward-wave optical device which produces the conjugate an arbitrary incident wave front is demonstrated. Good-quality reconstructed images are obtained through phase distorting media.
The 0.25 Hz-25 kHz pulse timing fluctuations of a Nd:YAG CW-mode-locked laser are reduced from 20.6 ps to less than 0.30 rms by an electronic phase-lock loop. Stabilizer design considerations include the phase control characteristics, detector additive noise, and spurious detection amplitude noise loop detector. Applications synchronization multiple picosecond pulsed lasers, lasers signal sources in physical measurements.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This Letter is the first report of observation amplified reflection and self-oscillation produced by degenerate optical four-wave mixing using a resonantly enhanced Kerr nonlinearity in atomic sodium vapor. Phase-conjugated reflected waves with intensities 100 times greater than input-signal were achieved only 40-kW/cm2 pump intensity.
Ankyloglossia has been associated with a variety of infant-feeding problems. Frenotomy commonly is performed for relief ankyloglossia, but there lack convincing data to support this practice.Our primary objective was determine whether frenotomy infants ankyloglossia improved maternal nipple pain and ability breastfeed. A secondary the length breastfeeding.Over 12-month period, neonates who had difficulty breastfeeding significant were enrolled in randomized, single-blinded, controlled trial...
Reconstructed images have been obtained by direct wave-front conjugation in atomic sodium vapor using a cw tunable dye laser. With pump power of only 15 mW conversion efficiency 0.2% has observed.
The validity of research results depends on the reliability analysis methods. In recent years, there have been concerns about that uses diffusion-weighted MRI (dMRI) to understand human brain white matter connections in vivo, part based methods used this field. We defined and assessed three dimensions dMRI-based tractometry, an technique assesses physical properties pathways: (1) reproducibility, (2) test-retest reliability, (3) robustness. To facilitate we provide software automates...
Cross-sectional studies have linked differences in white matter tissue properties to reading skills. However, past reported a range of, sometimes conflicting, results. Some suggest that act as individual-level traits predictive of skill, whereas others skill and develop function an individual's educational experience. In the present study, we tested two hypotheses: a) diffusion reflect stable brain characteristics relate individual ability or b) is dynamic system, with learning over time. To...
We present a new technique for measuring the intensity I(t) of optical pulses using temporal system. A diffraction grating pair followed by microwave-driven, phase modulator configured as time lens is used to uniquely map pulse shape from domain frequency domain, allowing measurement with spectrometer. discuss theory operation and experimental results illustrating 3 ps resolution.
The grating light valve (GLV) technology is a micromechanical phase grating. By providing controlled diffraction of incident light, GLV device will produce bright or dark pixels in display system. With pulse width modulation, precise gray-scale color variations. Built using micro electromechanical system technology, and designed to be manufactured mainstream IC fabrication the can made both small inexpensively. A variety systems built each benefiting form high contrast ratio, fill brightness...
This is the first reported demonstration of cw wavefront conjugation by degenerate four-wave mixing in a solid. Conversion efficiencies 3% for conjugate-wave generation were obtained ruby crystal using argon-ion laser.
In the letter we report development and characterisation of a planar-structure GaAs Schottky-barrier photodiode whose response to mode-locked laser pulse 600 nm wavelength has full-width half-maximum 5.4 ps 3 dB bandwidth 100 GHz.
Introduction. Let SL(n, q) denote the group of n by matrices determinant 1 over field GF(c7) q elements ; let PSL(n, be equal to modulo its center.The subgroups PSL(2, were determined Dickson [12].Those PSL(3, for odd Mitchell [19], using geometric methods.(The results even are given Hartley [18].)In this paper we show that more modern group-theoretic methods can used a new determination q), at least when is odd.(For result relevant case q, see Suzuki [28].)Our major Theorem 1.1.Let q=pa...