NASA Scientific and Technical Aerospace Reports

36
LASERS AND MASERS
Includes lasing theory, laser pumping techniques, maser amplifiers, laser materials, and the assessment of laser and maser outputs.
For cases where the application of the laser or maser is emphasized see also the specific category where the application is treated. For
related information see also 76 Solid-State Physics.
20040050721 Yale Univ., New Haven, CT
P-N Junction Diode Ultra-Violet Lasers with Directional Emission from Non-Circular Optical Cavities for Bio Sensing
Chang, Richard K.; Nov. 2003; 7 pp.; In English
Contract(s)/Grant(s): F49620-00-1-0182; Proj-2305
Report No.(s): AD-A421018; AFRL-SR-AR-TR-04-0156; No Copyright; Avail: CASI; A02, Hardcopy
The objectives of the past 12 months has been directed toward greater understanding of the laser emission from the spiral
structure and achieving for the first time, electrically pumped spiral micro-lasers. Another objective was to develop
micro-amplifiers which could increase the output emission. During the October 2002 site visit of Lt. Col. John Carrano of
DARPA and program manager of the SUVOS program, it became apparent that the low scale collaboration between Yale and
PARC was so successful and providing exciting possibilities, that Lt. Col. Carrano stepped up the funding for PARC to
increase their collaboration efforts with Yale. Therefore, besides just providing samples for us in our optical pumping
approach, as was the case in the past, PARC began to actively investigate the electrical pumping approach with close
collaboration with the Yale group.
DTIC
Detection; Junction Diodes; Optical Resonators; P-N Junctions; Semiconductor Lasers; Ultraviolet Lasers
20040050763 Air Force Inst. of Tech., Wright-Patterson AFB, OH
Model and Design of a Constant Modulation Current Bias Circuit for Measuring the Small Signal Response of
Semiconductor Lasers
Vap, Jason C.; May 2004; 99 pp.; In English
Report No.(s): AD-A421079; AFIT-CI04-136; No Copyright; Avail: CASI; A05, Hardcopy
The goal of this thesis was to design a constant modulation current bias circuit for measuring the single-pole, small-signal
optical response of a semiconductor laser between 1MHz and 10Hz. The results of this design will be used to conduct carrier
lifetime measurements with the impedance independent optical response technique essential for determining the carrier density
in the active region of the semiconductor laser, and extracting the A, B, and C coefficients of the spontaneous recombination
rate equation.
DTIC
Bias; Circuits; Models; Modulation; Semiconductor Lasers
37
MECHANICAL ENGINEERING
Includes mechanical devices and equipment; machine elements and processes. For cases where the application of a device or the host
vehicle is emphasized see also the specific category where the application or vehicle is treated. For robotics see 63 Cybernetics,
Artificial Intelligence, and Robotics; and 54 Man/System Technology and Life Support.
20040045252 Science Applications International Corp., Moffett Field, CA, USA
Air-Cooled Design of a Temperature-Swing Adsorption Compressor for Closed-Loop Air Revitalization Systems
Mulloth, Lila M.; Affleck, Dave L.; Rosen, Micha; LeVan, M. Douglas; Wang, Yuan; Cavalcante, Celio L.; [2004]; 1 pp.; In
English; 34rd International Conference on Environmental Systems Meeting, 19-22 Jul. 2004, Colorado Springs, CO, USA
Contract(s)/Grant(s): 131-20-10; No Copyright; Avail: Other Sources; Abstract Only
The air revitalization system of the International Space Station (ISS) operates in an open loop mode and relies on the
resupply of oxygen and other consumables from earth for the life support of astronauts. A compressor is required for delivering
the carbon dioxide from a removal assembly to a reduction unit to recover oxygen and thereby closing the air-loop. We have
a developed a temperature-swing adsorption compressor (TSAC) for performing these tasks that is energy efficient, quiet, and
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