A5102964890- Plasma Diagnostics and Applications
- Electrohydrodynamics and Fluid Dynamics
- Spacecraft Design and Technology
- Spacecraft and Cryogenic Technologies
- Radiation Effects in Electronics
- Astro and Planetary Science
- Rocket and propulsion systems research
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Space Satellite Systems and Control
- Microfluidic and Capillary Electrophoresis Applications
- Advanced MEMS and NEMS Technologies
- Spacecraft Dynamics and Control
- Semiconductor Quantum Structures and Devices
- Planetary Science and Exploration
- Diamond and Carbon-based Materials Research
- 3D IC and TSV technologies
- Mass Spectrometry Techniques and Applications
- Satellite Communication Systems
- Catalytic Processes in Materials Science
- Advanced materials and composites
- Cryptographic Implementations and Security
- Microwave-Assisted Synthesis and Applications
- Fullerene Chemistry and Applications
- Advanced Surface Polishing Techniques
Oerlikon (Germany)
2023
Jet Propulsion Laboratory
2000-2021
California Institute of Technology
1995-2020
Carl Zeiss (Germany)
2020
Tesat-Spacecom (Germany)
2009
Siemens (Germany)
2006
OSRAM (Germany)
1999-2003
TU Dortmund University
2000
RWTH Aachen University
1999
Pennsylvania State University
1989-1990
A 5.6 Gbps optical communication link has been verified in-orbit. The intersatellite uses homodyne BPSK (binary phase shift keying) and allows to transmit data with a duplex rate of bit error better than 10-9 between two LEO satellites, NFIRE (U.S.) TerraSAR-X (Germany). We report on the terminal design performance during measurement campaign. As an outlook we flight units adapted LEO-to-GEO links that TESAT currently builds plans study GEO-to-ground links.
PVD technologies, including vacuum arc evaporation and DC-magnetron sputtering, have been utilized in industrial settings since the early 1980s for depositing protective coatings. These coatings encompass a range of materials such as metal nitrides, carbonitrides, oxides, oxynitrides, DLC, serving diverse applications cutting forming tools, automotive components, decoration. Vacuum generates highly energized ionized particle flux toward substrate, while “classical” gas-ion-dominated direct...
This paper describes the results of our development a leak-tight piezoelectric microvalve, operating at extremely high upstream pressures for microspacecraft applications. The device is normally closed microvalve assembled and fabricated primarily from micromachined silicon wafers. consists custom-designed stack actuator bonded onto valve components (such as seat, boss, tether) with entire assembly contained within stainless steel housing. seat configurations include narrow-edge seating...
The design and fabrication of a newly proposed vaporizing liquid micro-thruster concept i s described. intended purpose this thruster is for use as an attitude control device o n new generations very small spacecraft envisioned by the National Aeronautics Space Administration (NASA), ranging in mass between 1-20 kg. heavily relies on microfabrication techniques to achieve order magnitude reductions both size weight fit limits microspacecraft. Attention was focused thermal aspects limit power...
Miniaturized ion thrusters are attractive for precision formation flying and many other future space missions. Their potential high-efficiency low-noise operation provides the mission designer with a uniquely option in mN thrust range. Caltech JPL have designed tested small, 3 cm diameter thruster that demonstrates propellant efficiency > 80% Isp 3100s using cathode generated xenon discharge. These investigations shown desirable discharge confinement is possible reasonably sized magnets,...
A micro-ion thruster assembly with a characteristic diameter of 3-cm has been developed at JPL for testing and optimization various system parameters.
Formation flying and microspacecraft constellation missions pose new propulsion requirements. Formationflying spacecraft, due to the tight positioning pointing control requirements, may need thrust within 1- 20 uN an accuracy of 0.1 for LISA ST-7, example. Future have extended ranges into sub - mN range. However, all do require high specific impulses (>500 sec) long required thruster firings.
In this communication we report on the performance characteristics of Bookham's latest generation 915-990 nm broad area single emitter (BASE) laser diodes with around 90 μm wide aperture. Representative high power devices in wavelength range 950-960 nm, mounted p-side down onto expansion matched assemblies using our highly reliable AuSn-solder technology, reveal a slope efficiency 1.05 W/A during CW operation at 25°C heat sink temperature. Coupling into multi-mode fiber 0.15 or 0.22...
Europa is the primary target of Astrobiology in our Solar System because its ocean has all necessary ingredients (water, chemicals, energy) to support extant life. Reaching Europa's requires penetrating through up 30km partially cryogenic ice, salts, and frozen sulphuric acid. There are two methods ice: mechanical thermal. Each these unique advantages disadvantages but neither sufficient reach independently. SLUSH Drill (Search for Life Using Submersible Heated Drill) a hybrid drilling...
The high NA=0.55 EUV scanner has an obscuration in the pupil. This led to choice expand aberration wave-front not Zernikes anymore, but other, orthogonal, basis-functions instead. reasons for this and description of will be discussed.
Future microspacecraft will require significant propulsive capability in order to accomplish the wide array of missions currently envisioned. The development candidate propulsion systems including cold gas, chemical and ion thrusters be necessary fulfill maneuvering requirements. This study focuses on design considerations associated with scaling for use microspacecraft. Scaling issues that affect device performance as well limitations are presented. General presented nozzle flows,...
Recent advances in the development of several micropropulsion components for microspacecraft applications are reported. These include a vaporizing liquid micro-thruster, micro ion engine, micro-isolation valve, micro-piezo and micro-solenoid valve. envisioned to be integrated with chip-based driver power conditioning electronics into highly integrated, compactly configured modules, reducing overall system weight size as well cost complexity propulsion integration. Proof-of-concept...
The development and fabrication of microfabricated propulsion components at the Jet Propulsion Laboratory is reviewed. These include a vaporizing liquid micro-thruster, which vaporizes propellant to produce thrust. Thrust performances 32 (mu) N for an input power 0.8 W were measured. Miniature solenoid latch valves are being developed by Moog, Inc. in collaboration with JPL.
AlGaAs/InGaAs based high power pump laser diodes with wavelength of around 980 nm are key products within erbium doped fiber amplifiers (EDFA) for today's long haul and metro-communication networks, whereas InGaAsP/InP 14xx emission relevant advanced, but not yet widely-used Raman amplifiers. Due to the changing industrial environment cost reduction becomes a crucial factor in development new, modules. Therefore, chips were aggressively optimized terms conversion thermal stability, which...
Reliable power scaling by stretching the cavity length of laser bars ranging from 1.2 mm to 3.6 at constant filling factor 50% is demonstrated. While a relatively short allows for thermally limited CW output powers in excess 180 W, extremely high 325 W 420 A (CW, 16°C) have been achieved leveraging enhanced thermal properties on standard micro-channel coolers. electro-optical conversion efficiency 62% and 51% respectively attributed low internal losses an optimized waveguide design excellent...
We discuss the performance and reliability of oxide confined VCSELs optimized for datacom applications. The devices are employed in Siemens PAROLI/sup TM/ high parallel optical link. This link provides 12 channels with a total bandwidth exceeding Gbit/s. VCSEL threshold current is approximately 3 mA. variation within array less than 50 /spl mu/A. electrical series resistance about Omega/. emission wavelength 850 nm matches specification common standards like HIPPI 6400. Life times several...
This paper presents a leak-tight piezoelectric microvalve, operating at extremely high upstream pressures for microspacecraft applications. The device is normally-closed microvalve fabricated mostly by the micromachining of silicon wafers. consists custom-designed stack actuator bonded onto valve components, such as seat, boss and tether, in stainless steel housing. Major seating configurations include narrow edge rings tensile-stressed tethers that contribute to desired operation....