Assessment of the In-House Laboratory Independent Research at the Army's Research, Development, and Engineering Centers (2020) / Chapter Skim
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9 Physics
9 Physics
Pages 96-107
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From page 96... ...
During each presentation the panel engaged in question-and-answer sessions with the presenter, and a general discussion with RDEC staff after the panel had formulated initial impressions and developed additional questions during its closed-session deliberations, conducted after the RDEC staff had concluded their presentations. AVIATION AND MISSILE RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER Project: Collision Broadening and Hyperfine State-Changing Collisions at Very Low Densities in Atomic Vapor Cells This research is directed toward noninvasive diagnostics of atomic vapor cells for improving accuracy of rubidium (Rb)
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From page 97... ...
A careful description of the dynamics of the bound and free electrons includes a detailed treatment of linear and nonlinear dispersions at the interface and inside the volume. Using an in-house developed pulse propagation method at the interface of the medium with the vacuum leads to a number of predictions, involving in particular nonlocal effects, second-harmonic generation, third harmonic generation, the onset of plasmon oscillations, plasma frequency redshifts, and
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From page 98... ...
The EBIC technique has long been used (starting with early studies of silicon devices) to characterize carrier transport, in addition to the imaging of electrically active material defects and integrated circuit failure analysis.
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From page 99... ...
Electrochemical deposition from an acidic aqueous bath was used to deposit the wide-gap II-VI semiconductor ZnTe as a surface passivation layer on narrow-gap III-V IR detector structures with InAslike surfaces exhibiting surface leakage current. The work explored important practical questions: Can a high-quality, semi-insulating ZnTe layer be electrodeposited on relevant III-V IR detector materials?
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From page 100... ...
Such an approach is needed because it eliminates the bias of human vision and interpretation (i.e., soldier testing) and is very important when nonlinear optical transfer or imaging is encountered, due to atmospheric turbulence, image distortion optics, dust clouds, or visual impairment.
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From page 101... ...
NATICK SOLDIER RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER Project: Atomic-Scale Quantum Rectification The major goal of this project is to study the potential of nonlinear metamaterials for optical rectification of visible and IR radiation and, more generally, to study the potential of metal-insulator-metal (MIM) and memristor diodes to act as platforms for nonlinear metamaterials.
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From page 102... ...
The ultimate goal of the research is to develop improved understandings to allow the reduction of the drag and noise. The researcher provided an excellent introduction to the basic physical phenomena and demonstrated a solid understanding of the problem.
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From page 103... ...
The research involves developing atmospheric turbulence measurement instrumentation that will be useful to interpret and even control a high-energy laser beam system propagating through atmospheric turbulence, dust, and haze near the ground. The researchers studied and compared two techniques, which are the metric-based adaptive optics system that optimizes a bright spot and the Shack–Hartmann wavefront sensor that measures the fundamental optical wavefront so that more precise correction can be made during the freeze or decorrelation time of the atmosphere.
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From page 104... ...
Project: Direct Diode High-Energy Laser Research This project plans to identify combinations of present and emerging diode laser technologies and approaches and leverage investments and progress made on a master oscillator power amplifier (MOPA) for an innovative direct diode phased array system with coherent beam combining methods, as well as a spectral combination method using on-chip photonics pioneered in the telecommunications industry for high-density, robust, spectral beam combining of the thousands of emitters.
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From page 105... ...
However, the researchers need to pay serious attention to the thermal management issues, which have been funded under several Small Business Innovation Research programs to small industrial organizations. Project: Hybrid Diode-Pumped Rare Gas Laser Research Gas lasers have reached hundreds of kilowatts using monolithic aperture beam paths at high beam quality but have historically relied on hazardous gases like iodine, fluorine, and oxygen or highly corrosive alkali metal vapor.
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From page 106... ...
Sometimes it is valid that the criteria for project selection be just to build research knowledge at the basic research level within a given center. A small number of ILIR programs do seem to build research knowledge at the basic level within its center, and this is excellent.
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From page 107... ...
CERDEC, NSRDEC, and SMDC all had projects that could have included more metrics used to gauge technical progress in their research. Recommendation: CERDEC, NSRDEC, and SMDC should specify metrics used to gauge technical progress in their research.
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