Summary of the development of optical waveguides and components
Design, fabrication, and testing of optical waveguides and components for laser applications
WAVEGUIDE↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Input admittance of a rectangular waveguide- fed aperture antenna radiating into an inhomogeneous lossy dielectric slab
Input admittance of rectangular waveguide antenna radiating into inhomogenous lossy plasma slab and dielectric constant variations
DIELECTRIC CONSTANT↗
Mutual coupling between TEM and TE sub 01 parallel-plate waveguide apertures.
Mutual coupling between TEM and TE 01 parallel- plate waveguides calculated, using wedge diffraction techniques
TRANSVERSE WAVE↗
Cutoff frequencies of eccentric waveguides.
Point matching method, solving boundary value problem in uniform cylindrical waveguide with inserted conductor within conducting tube
CYLINDRICAL SHELL↗
A stepped mode transducer using homogeneous waveguides.
Rectangular to cylindrical waveguide transducer which couples dominant rectangular and cylindrical transverse electromagnetic modes
WAVEGUIDE↗
A spatially coherent optical waveguide detector.
Optical detector using length of single mode optical waveguide with photodetector at output for null detection
WAVEGUIDE↗
On the Calculation of Noise Temperature in Beam-Waveguide Systems
None given. Paper covers the NASA Deep Space Network (DSN) Goldstone Complex in Mojave, California, and their beam-waveguide (BWG) antenna complex. They discuss system noise temperature,its major contributor, and its correction.
deep space network antenna noise temperature Beam-↗
Compensation of Gravity-Induced Structural Deformations on a Beam- Waveguide Antenna Using a Deformable Mirror
At the NASA Deep Space Network (DSN) Goldstone Complex, a 34-meter- diameter beam-waveguide antenna, DSS-13, was constructed in 1988-1990 and has become an integral part of an advanced systems program and a test bed for technologies being developed to introduce Ka-band (32 GHz) frequencies into the DSN. A method for compensating the gravity- induced structural deformations in this large antenna is presented.
technologies DSN↗
Noise Temperature Contribution of a Dichroic Plate in a Beam-Waveguide Antenna System
A 34m diameter antenna, built for NASA/JPL in 1990 at Goldstone, California, utilizes a beam-waveguide (BWG) design. It was discovered that if a dichroic plate is installed in a BWG antenna environment, high noise temperatures can result if the receiver system passband is greater than the passband for which the plate was designed. A method is presented for accurately calculating dichroic plate noise temperature for these conditions.
Dichroic Plate Beam-Waveguide Antenna↗
A Novel Split-Waveguide Mount Design For MM and SubMM wave frequency multipliers and Harmonic Mixers
A novel split-waveguide mount for millimeter and submillimeter wave frequency multipliers and harmonic mixers is presented. It consists of only two pieces, block halves, which are mirror images of each other.
novel split-waveguide↗
Modification and Identification of the Beam Waveguide Antenna Control System Model
This work is the first step toward increasing the bandwidth of the NASA/JPL 34 meter beam waveguide (BWG) antenna position loop controller.
Beam Waveguide Antenna↗
A New Technique for Vernier Pointing of a Beam-Waveguide Antenna
This paper presents a new and simple approach for the Ka-band vernier pointing of a 34m beam-waveguide (BWG) antenna (also applicable to a 70m antenna. In this study, rotation of a BWG flat mirror, located at the elevation axis, is used to scan the beam instead of using the very large tipping structure of the antenna.
antenna pointing vernier pointing beam-waveguide K↗
Frequency Tripler with Integrated Back-to-Back Barrier -N-N(sup +) (bbBNN) Varactor Diodes in a Novel Split-Waveguide Block at 220 GHz
A frequency tripler has been developed using an integrated planar back-to-back -n-n(sup +) varactor device in a waveguide mount at 220 GHz.
frequency tripler split-waveguide block design int↗
Characteristics of the Single-Longitudinal-Mode Planar-Waveguide External Cavity Diode Laser at 1064 nm
We describe the characteristics of the planar-waveguide external cavity diode laser (PW-ECL). To the best of our knowledge, it is the first butterfly-packaged 1064 nm semiconductor laser that is stable enough to be locked to an external frequency reference. We evaluated its performance from the viewpoint of precision experiments. Using a hyperfine absorption line of iodine, we suppressed its frequency noise by a factor of up to 104 at 10 mHz. The PWECL's compactness and low cost make it a candidate to replace traditional Nd:YAG nonplanar ring oscillators and fiber lasers in applications that require a single longitudinal mode.
planar-waveguide↗
Free-Space Quantum Key Distribution with a High Generation Rate KTP Waveguide Photon-Pair Source
NASA awarded Small Business Innovative Research (SBIR) contracts to AdvR, Inc to develop a high generation rate source of entangled photons that could be used to explore quantum key distribution (QKD) protocols. The final product, a photon pair source using a dual-element periodically- poled potassium titanyl phosphate (KTP) waveguide, was delivered to NASA Glenn Research Center in June of 2015. This paper describes the source, its characterization, and its performance in a B92 (Bennett, 1992) protocol QKD experiment.
photons↗
Waveguide Modulator for Interference Tolerant Functional Near Infrared Spectrometer (fNIRS)
Many crew-related errors in aviation and astronautics are caused by hazardous cognitive states including overstress, disengagement, high fatigue and ineffective crew coordination. Safety can be improved by monitoring and predicting these cognitive states in a non-intrusive manner and designing mitigation strategies. Measuring hemoglobin concentration changes in the brain with functional Near Infrared Spectroscopy is a promising technique for monitoring cognitive state and optimizing human performance during both space and aviation operations. A compact, wearable fNIRS system would provide an innovative early warning system during long duration missions to detect and prevent vigilance decrements in pilots and astronauts. This effort focused on developing a waveguide modulator for use in a fNIRS system.
spectroscopy↗
InP-Based Ridge Waveguide Lasers for Wavelength Division Multiplexing Applications
Wavelength division multiplexed (WDM) systems place stringent requirements on the absolute wavelength and wavelength spacing of the elements in laser arrays. Ridge waveguides (RW) show excellent potential for practical implementation due to their simple fabrication with relaxed fabrication tolerances, high reliability and good performancce. An analysis of the fabrication tolerances for RW and buried heterostructure (BH) devices is performed, showing the advantages offered by the ridge design.
wavelength↗
A Novel Noncontacting Waveguide Backshort for Submillimeter Wave Frequencies
A novel noncontacting waveguide backshort has been developed which provides excellent performance. It consists of a metallic bar with rectangular or circular holes. It has the advantage of being mechanically rugged and readily fabricated using a variety of methods for frequencies up to the high submillimeter wave range.
waveguide↗