Dr. Frederick K. Knight Profile

Dr. Frederick K. Knight

at MIT Lincoln Lab

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 17 September 2007 Paper

Radiation effects in two InGaAs focal plane arrays

Frederick Knight, Matthew Waldon, Brian Greensmith, Michael Mattei, Lado Tonia, Nicholas Gould

Proceedings Volume 6690, 66900E (2007) https://doi.org/10.1117/12.730646

KEYWORDS: Staring arrays, Readout integrated circuits, Indium gallium arsenide, Radiation effects, Electronics, Cameras, Mars, Sensors, Mercury cadmium telluride, Gamma radiation

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Proceedings Article | 22 April 1993 Paper

Time-resolved beam profiler for pulsed lasers

David Klick, Frederick Knight

Proceedings Volume 1834, (1993) https://doi.org/10.1117/12.143864

KEYWORDS: Streak cameras, Imaging systems, Fiber optics, Pulsed laser operation, Spatial resolution, Picosecond phenomena, Cameras, Diffraction, Laser beam diagnostics, Image resolution

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Proceedings Article | 1 January 1993 Paper

Applications of a streak-camera-based imager with simultaneous high space and time resolution

David Klick, Frederick Knight

Proceedings Volume 1801, (1993) https://doi.org/10.1117/12.145768

KEYWORDS: Streak cameras, Imaging systems, Fiber optics, Spatial resolution, Pulsed laser operation, Image resolution, 3D image processing, 3D acquisition, Picosecond phenomena, Sensors

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A high-speed imaging device has been built that is capable of recording several hundred images over a time span of 25 to 400 ns. The imager is based on a streak camera, which provides both spatial and temporal resolution. The system's current angular resolution is 16 X 16 pixels, with a time resolution of 250 ps. It was initially employed to provide 3-D images of objects, in conjunction with a short-pulse (approximately 100 ps) laser. For the 3-D (angle-angle-range) laser radar, the 250 ps time resolution corresponds to a range resolution of 4 cm. In the 3-D system, light from a short-pulse laser (a frequency-doubled, Q-switched, mode-locked Nd:YAG laser operating at a wavelength of 532 nm) flood-illuminates a target of linear dimension approximately 1 m. The returning light from the target is imaged, and the image is dissected by a 16 X 16 array of optical fibers. At the other end of the fiber optic image converter, the 256 fibers form a vertical line array, which is input to the slit of a streak camera. The streak camera sweeps the input line across the output phosphor screen so that horizontal position is directly proportional to time. The resulting 2-D image (fiber location vs. time) at the phosphor is read by an intensified (SIT) vidicon TV tube, and the image is digitized and stored. A computer subsequently decodes the image, unscrambling the linear pixels into an angle-angle image at each time or range bin. We are left with a series of snapshots, each one depicting the portion of target surface in a given range bin. The pictures can be combined to form a 3-D realization of the target. Continuous recording of many images over a short time span is of use in imaging other transient phenomena. These applications share a need for multiple images from a nonrepeatable transient event of time duration on the order of nanoseconds. Applications discussed for the imager include (1) pulsed laser beam diagnostics -- measuring laser beam spatial and temporal structure, (2) reflectivity monitoring during pulsed laser annealing of microelectronics, and (3) detonics or shock wave research, especially microscopic studies of shocks produced by laser pulses.

SPIE Journal Paper | 1 January 1991

Visible laser radar: range tomography and angle-angle-range detection

Frederick Knight, David Klick, Danette Ryan-Howard, Joseph Theriault

OE, Vol. 30, Issue 01, (January 1991) https://doi.org/10.1117/12.10.1117/12.55773

KEYWORDS: Sensors, Tomography, Streak cameras, Target detection, 3D acquisition, Fiber optics, LIDAR, 3D image processing, Reflectivity, Calibration

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