A5028876471- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Photonic and Optical Devices
- Cosmology and Gravitation Theories
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Geophysics and Sensor Technology
- Astrophysics and Cosmic Phenomena
- High-pressure geophysics and materials
- Photorefractive and Nonlinear Optics
- Atomic and Subatomic Physics Research
- Semiconductor Lasers and Optical Devices
- Statistical and numerical algorithms
- Seismic Waves and Analysis
- Astronomical Observations and Instrumentation
- Photonic Crystals and Applications
- Radio Astronomy Observations and Technology
- earthquake and tectonic studies
- Advanced Fiber Optic Sensors
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Magnetic confinement fusion research
- Superconducting Materials and Applications
Louisiana State University
2017-2024
California Institute of Technology
2023-2024
Louisiana State University Agricultural Center
2022
California State University, Fullerton
2017-2018
University of Glasgow
1984-1989
Quantum noise imposes a fundamental limitation on the sensitivity of interferometric gravitational-wave detectors like LIGO, manifesting as shot and quantum radiation pressure noise. Here, we present first realization frequency-dependent squeezing in full-scale detectors, resulting reduction both noise, with broadband detector enhancement from tens hertz to several kilohertz. In LIGO Hanford detector, reduced amplitude by factor 1.6 (4.0 dB) near 1 kHz; Livingston was 1.9 (5.8 dB). These...
A pump–probe Mach–Zehnder interferometer was used to investigate the nonlinear-optical properties of CdSxSe1-x-doped glass channel waveguides. The technique is in situ and may be determine suitability material under investigation for all-optical switching. saturation dynamical are readily determined by using technique, as thermal effects. Semiconductor-plasma theory predict nonlinear optical properties, reasonable agreement with experiment obtained.
Fluence-induced changes in absorption of a semiconductor-doped-glass directional coupler have resulted nonlinear optical switching on picosecond time scale. The functional dependence the incident fluence confirms that is dominated by saturation.
The properties of planar waveguides and directional couplers fabricated by potassium/sodium ion exchange in semiconductor-doped glasses are described.
We show that large changes are introduced into the operational characteristics of nonlinear directional couplers by both loss and saturation nonlinearity, especially latter. Specific numerical examples given.
Precision measurements of space and time, like those made by the detectors Laser Interferometer Gravitational-wave Observatory (LIGO), are often confronted with fundamental limitations imposed quantum mechanics. The Heisenberg uncertainty principle dictates that position momentum an object cannot both be precisely measured, giving rise to apparent limitation called Standard Quantum Limit (SQL). Reducing noise below SQL in gravitational-wave detectors, where photons used continuously measure...
We have measured nonlinear-optical effects in ion-exchanged channel waveguides fabricated semiconductor-doped glass. The nonlinearity is manifested as optically induced saturable absorption displaying a resonant enhancement. relaxation time of the was found to be tens picoseconds. also exhibited wavelength dependence. Waveguide transmission and pulse-probe experiments using picosecond mode-locked dye laser were used carry out these measurements.
Optical switching was observed within a pulse train during prism coupling into nonlinear potassium-ion-exchanged semiconductor-doped-glass waveguide with modified composition. An interpretation of the phenomenon is given in terms slow (probably thermal) nonlinearity.
Quantum mechanics places noise limits and sensitivity restrictions on physical measurements. The balance between unwanted backaction the precision of optical measurements imposes a standard quantum limit (SQL) interferometric systems. In order to realize below SQL, it is necessary leverage evading measurement technique, reduce thermal level backaction, exploit cancellations any excess contributions at detector. Many proof principle experiments have been performed, but only recently has an...
Modern interferometers such as LIGO have achieved sensitivities limited by quantum noise, comprising radiation pressure and shot noise. To mitigate this a static system is employed that minimizes the noise within measurement band. However, since gravitational wave inspiral signals are single frequency changing over time, only at chirp needs to be minimized. Here we demonstrate proof-of-principle experiment of dynamically tracking target signal using an optical spring, resulting in increased...
Single-mode optical Y junctions have been fabricated using silver-ion exchange in glass. Radiation losses are given for several different input conditions to the branch arms when junction is used as an power combiner. A minimum radiation loss of 3 dB has measured only one arm excited.
Metrology experiments can be limited by the noise produced laser involved via small fluctuations in laser's power or frequency. Typically, active stabilization schemes consisting of an in-loop sensor and a feedback control loop are employed. Those fundamentally shot coupling at sensor. In this Letter, we propose to use optical spring effect passively stabilize classical beam. proof principle experiment, show that relative is stabilized from approximately 2 × 10-5 Hz-1/2 minimum value 1.6...
Gravitational waves from merging neutron stars are expected to be observed in the next 5 years. We explore potential impact of matter effects on gravitational double neutron-star binaries. If star binaries exist with chirp masses less than roughly 1 solar mass and typical radii larger 14 km, or if 15-16 km for galactic binaries, then will have a significant effectiveness point-particle-based search at Advanced LIGO design sensitivity (roughly 5% additional loss signals). In configuration...
The saturated nonlinear refractive-index change in a CdSxSe1−x semiconductor-doped glass channel waveguide was measured with picosecond pump-probe Mach–Zehnder interferometer at photon energies below the band gap. configuration permitted resolution of competing thermal and electronic nonlinearities. significance results for all-optical switching is discussed.
An interferometric technique for measuring with picosecond resolution the time evolution of real and imaginary components optical nonlinearities in channel waveguides is described. Characteristics are illustrated measurements band-filling CdS(x)Se(1-x)-doped glass waveguides.
Gravitational-wave detectors are ultimately limited by quantum fluctuations induced light reflecting off the interferometer mirrors. A new experiment explores one way to remove this backaction and improve detector sensitivity.
The GQuEST (Gravity from the Quantum Entanglement of Space-Time) experiment uses tabletop-scale Michelson laser interferometers to probe for fluctuations in space-time. We present an interferometer design featuring a novel photon counting readout method that provides unprecedented sensitivity, as it is not subject interferometric standard quantum limit. evaluate potential this measure space-time motivated by recent `geontropic' gravity models. accelerated accrual statistical power offered...
Modern interferometers such as LIGO have achieved sensitivities limited by quantum noise, comprised of radiation pressure and shot noise. To mitigate this a static system is employed that minimizes the noise within measurement band. However, since gravitational wave inspiral signals are single frequency changing over time, only at chirp needs to be minimized. Here we demonstrate dynamically tracking target signal using an optical spring, resulting in increased ratio (SNR). We report on SNR...
The radiation-pressure driven interaction of a coherent light field with mechanical oscillator induces correlations between the amplitude and phase quadratures light. These result in squeezed -- quantum noise lower than shot some quadratures, higher others. Due to this uncertainty, can be used improve sensitivity precision measurements. In particular, sources based on nonlinear optical crystals are being gravitational wave (GW) detectors. For optomechanical squeezers, thermally fluctuations...
We present a design for new microresonator whose geometry is optimized to maximize sub-Standard Quantum Limit (SQL) performance. The predicted have thermal noise well below the SQL across broad range of frequencies when operated at 10K. performance this designed will allow it serve as test-bed quantum non-demolition measurements, and open regimes precision measurement that are relevant many practical sensing applications, including advanced gravitational wave detectors.
A large (n 2 ~ 10 -13 - -14 m /W) and fast (less than 16 ps) third-order optical susceptibilities has recently been identified in semiconductor doped glasses. Low-loss channel waveguides have made these glasses used the fabrication of integrated nonlinear devices such as coherent coupler which may be able to operate an all-optical logic gate.