A5105085008- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Optical Wireless Communication Technologies
- Space Satellite Systems and Control
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Solid State Laser Technologies
- Astronomy and Astrophysical Research
- Spacecraft Dynamics and Control
- Photonic Crystal and Fiber Optics
- Laser-induced spectroscopy and plasma
- Space Science and Extraterrestrial Life
- Optical Network Technologies
- Spectroscopy and Laser Applications
- Satellite Communication Systems
- Laser-Matter Interactions and Applications
- Particle Detector Development and Performance
- Calibration and Measurement Techniques
- Superconducting and THz Device Technology
- Advanced Frequency and Time Standards
- Spacecraft Design and Technology
- Advanced Semiconductor Detectors and Materials
- Photorefractive and Nonlinear Optics
- Electrocatalysts for Energy Conversion
University of California, Santa Barbara
2014-2024
University of Glasgow
2024
Arizona State University
2024
Boeing (United States)
2018
Jet Propulsion Laboratory
2018
Nikon (United States)
2018
Goddard Space Flight Center
2018
Optical Sciences (United States)
2018
University of Arizona
2018
While terahertz (THz) communication systems, operating from 100 GHz to 1 THz, have the potential exploit wide swaths of unused spectrum for ultra-high bitrate communication, there are significant challenges. Particularly, strong absorption water vapor can result in very high atmospheric attenuation. We modeled a ground geostationary satellite link and found that using large aperture THz stations, patterned after 12.5 m Atacama Large Microwave Array dish 3.5 Herschel Space Observatory optics,...
Abstract We investigate various short-warning mitigation scenarios via fragmentation for a hypothetical impact of asteroid 2023 NT1, near-Earth object (NEO) that was discovered on July 15, two days after its closest approach to Earth 13. The passed by within ∼0.25 lunar distances, with ∼1 × 10 5 km and velocity 11.27 s −1 . Its size remains largely uncertain, an estimated diameter range 26–58 m most probable estimate 34 (JPL Sentry, September 15; weighted the NEO frequency distribution). If...
We present results of optical simulations for a laser phased array directed energy system. The consists individual elements in square or hexagonal array. In multi-element array, the far-field beam pattern depends on both mechanical pointing stability and phase relationships between elements. simulation incorporates realistic errors. Pointing error components include systematic offsets to simulate manufacturing assembly variations. also includes time-varying errors that structural vibrations,...
On 15 February 2013, a previously unknown ~20 m asteroid struck Earth near Chelyabinsk, Russia, releasing kinetic energy equivalent to ~570 kt TNT. Detecting objects like the Chelyabinsk impactor that are orbiting is difficult task, in part because such spend much of their own orbits direction Sun when viewed from Earth. Efforts aimed at protecting future impacts will rely heavily on continued discovery. Ground-based optical observatory networks and Earth-orbiting spacecraft with infrared...
A downlink for the return of scientific data from space probes at interstellar distances is studied. The context moving relativistic speed using a terrestrial directed-energy beam propulsion, necessitating very-low mass probes. Achieving simultaneous communication swarm launched regular intervals to target distance Proxima Centauri addressed. analysis focuses on fundamental physical and statistical limitations performance rather than concrete implementation. Transmission time/distance probe...
For interstellar missions, directed energy is envisioned to drive wafer-scale spacecraft relativistic speeds. Spacecraft propulsion provided by a large array of phase-locked lasers, either in Earth orbit or stationed on the ground. The directed-energy beam focused spacecraft, which includes reflective sail that propels craft reflecting beam. Fluctuations and asymmetry will create rotational forces sail, so geometry must possess an inherent, passive stabilizing effect. A hyperboloid shape...
Asteroids and comets that cross Earth's orbit pose a credible risk of impact, with potentially severe disturbances to Earth society. Numerous mitigation strategies have been described, most involving dedicated missions threatening object. We propose an orbital planetary defense system capable heating the surface hazardous objects vaporization point as feasible approach impact mitigation. call DE-STAR for Directed Energy System Targeting exploRation. is modular phased array kilowatt class...
Abstract This paper presents a study for the realization of space mission which employs nanosatellites driven by an external laser source impinging on optimized lightsail, as valuable technology to launch swarms spacecrafts into Solar System. Nanosatellites propelled can be useful heliosphere exploration and planetary observation, if suitably equipped with sensors, or adopted establishment network systems when placed specific orbits. By varying area-to-mass ratio (i.e. between sail area...
Molecular composition of distant stars is explored by observing absorption spectra. The star produces blackbody radiation that passes through the molecular cloud vaporized material surrounding star. Characteristic lines are discernible with a spectrometer, and investigated comparing spectral observations known profiles. Most objects in solar system—asteroids, comets, planets, moons—are too cold to be interrogated this manner. clouds around consist primarily volatiles, so bulk cannot probed....
Directed energy phased array (DEPA) systems have been proposed for novel applications such as beaming optical power electrical use on remote sensors, rovers, spacecraft and future moon bases, well planetary defense against asteroids photonic propulsion up to relativistic speeds. All scenarios involve transmission through atmosphere beam perturbations due turbulence which must be quantified. Numerical propagation feedback control simulations were performed using an algorithm optimized...
The design of a downlink communication system for returning scientific data from an interstellar flyby probe is reviewed in this tutorial white paper. It its assumed that the ballistic, and downloaded during period following encounter with target star exoplanet(s). Performance indices interest to investigators include total launch-to-completion latency volume reliably recovered. Issues considered interaction between speed mass duration transmission. Optical using pulse-position modulation...
Arrays of phase-locked lasers have been developed for numerous directed-energy applications.Phased-array designs are capable producing higher beam intensity than similar sized multi-beam emitters, and also allow steering profile manipulation.In phased-array designs, individual emitter phases must be controllable, based on suitable feedback.Most current control schemes sample phases, such as with an array-wide splitter, compare to a master phase reference.Reliance global splitter limits...
We describe the requirements and associated technology development plan for communications data link from low mass interstellar probes. This work is motivated by several proposed deep space missions with an emphasis on Breakthrough Starshot project. The project effort to send first probes nearby star systems transmit back scientific acquired during system transit within time scale of a human lifetime. about 104-fold increase in distance stars compared outer planets our solar requires new...
We evaluate the feasibility of implementing a polarization diverse scheme to facilitate beacon based phase locking long baseline laser phased array.
We evaluate the performance of a 10 W CW Ytterbium doped fiber amplifier system operating at 1064 nm suitable for use in laser phased array directed energy system. The is optimized beacon based topology.
We have developed an ultra-low noise 94 GHz MMIC amplifier using InGaAs/InAlAs/InP transistor technology. The designs incorporate a single stage with input and output matching networks as well gate drain bias networks. Two MMICs been incorporated into housing providing 10 dB of gain. At room temperature, the integrated has measured 365 K at GHz. Cryogenic measurements performed direct detection total power radiometer all amplification provided by amplifiers. figure for entire to be 78 K....
Effective transfer of beamed optical energy to a spacecraft requires that the source have sufficiently small angular divergence contain beam within area collector. Such directed system could be achieved by coherently combining many sources distributed throughout large-scale array. The fundamental unit such is master oscillator power amplifier (MOPA) which consists frequency stabilized laser trees in A challenge long baseline coherent combination each combined with sub-wavelength accuracy...
To probe the molecular composition of a remote target, laser is directed at spot on where melting and evaporation occur. The heated serves as high-temperature blackbody source, ejected substance creates plume surface materials in front spot. Bulk material investigated by using spectrometer to view through plume. proposed method distinct from current stand-off approaches analysis, such Laser-Induced Breakdown Spectroscopy (LIBS), which atomizes ionizes target observes emission spectra...
The long standing approach to space travel has been incorporate massive on-board electronics, probes and propellants achieve exploration. This led many great achievements in science, but will never help explore the interstellar medium. Fortunately, a paradigm shift is upon us how spacecraft constructed propelled. paper describes mission concept get our Sun’s Gravity Lens at 550AU less than 10 years. It be done by using DE-STAR, scalable solar-powered phased-array laser Earth Orbit, as...
Lasers are commonly used in high-precision measurement and profiling systems. Some laser systems based on interferometry principles, others active triangulation, depending requirements of the application. This paper describes an triangulation system for a specific application wherein relative position two fixed, rigid mechanical components is to be measured dynamically with high precision six degrees freedom (DOF). Potential applications include optical feedback control vibration, such as...
Abstract A balloon‐born stabilized platform has been developed for the remotely operated altitude‐azimuth pointing of a millimetre wave telescope system. This paper presents development and implementation model reference adaptive control (MRAC) azimuth‐pointing system platform. The primary goal controller is to achieve RMS better than 0.1°. Simulation results indicate that MRAC can 0.01°. Ground test show 0.03°. Data from first flight at National Scientific Balloon Facility (NSBF),...