New Spectrometer Designs for AVIRIS
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imaging spectrometer optical design hyperspectral ↗
Engineering topics
Mouroulis, P.
Publications and source records attributed to Mouroulis, P..
Fiber Raman and Reflectance Spectroscopy for Planetary Mineralogy
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In situ instrument mineralogy Raman spectroscopy r↗
Diffractive Optical Elements for Spectral Imaging
Diffractive optical elements fabricated on flat and non-flat substrates frequently act as dispersive elements in imaging spectrometers. We describe the design and electron-beam fabrication of blazed and computer-generated-hologram gratings for slit and tomographic imaging spectrometers.
diffractive optics gratings spectral imaging imagi↗
Prospects and Issues for Spaceborne Imaging Spectrometers that Achieve AVIRIS Levels of Performance
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imaging spectroscopy optical design↗
Pushbroom Imaging Spectrometer Design for Optimum Recovery of Spectroscopic and Spatial Information
An MTF-based optimization method is described that can extract maximum spectral and spatial uniformity of response from compact pushbroom imaging spectrometer designs.
imaging spectroscopy pushbroom imaging↗
Pushbroom Imaging Spectrometer with High Spectroscopic Data Fidelity: Experimental Demonstration
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distortion calibration↗
Spectral and Spatial Uniformity in Pushbroom Imaging Spectrometers
Two simple and compact pushbroom spectrometer forms are described that can satisfy stringent spectral and spatial uniformity requirements in terms of minimizing distortion as well as the variation of the pixel spectral and spatial response functions.
Imaging↗
Trade Studies in Multi/Hyperspectral Imaging Systems Final Report
This report is concerned with Earth-observing systems, operating in the solar reflected spectrum, and from Low Earth Orbit.
trade studies solar reflected spectrum Low Earth O↗
Atmospheric Sounder For Improving Stand-Off Surface and Near-Surface Sensing
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Spectroscopic Atmospheric Sounder Stand-Off Surfac↗
A Compact, Low-Distortion Imaging Spectrometer for Remte Sensing
We describe a pushbroom imaging spectrometer having a number of attractive features for remote sensing applications, including compact and simple form, good image quality, high effciency, and very low levels of distortion.
electron-beam lithography↗
A Compact, Low-Distortion Imaging Spectrometer for Remote Sensing Applications
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imaging spectrometer optical design diffractive el↗
Low-Distortion Imaging Spectrometer Designs Utilizing Convex Gratings
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convex electron-beam-lithography-generated grating↗
New Convex Grating Types Manufactured by Electron Beam Lithography
High-performance blazed gratings have been fabricated on convex surfaces by electron beam lithography, for use in an instrument to be flown on NASA's NM-EO1 spacecraft.
electron beam lithography high-performance blazed ↗
Low-distortion Imaging Spectrometer Designs Utilizing Convex Gratings
Several designs that are based on the Offner concentric spectrometer form, with the grating formed on the convex secondary mirror.
convex secondary mirror Convex Gratings Low-distor↗
New Convex Grating Types for Concentric Imaging Spectrometers
The properties of convex gratings fabricated by electron-beam lithography are investigated. Three grating types are shown. These gratings allow the optical designer to fully realize the considerable advantages of concentric spectrometer forms.
spectrometers concentric imaging electron beam↗
High power diode laser Master Oscillator-Power Amplifier (MOPA)
High power multiple quantum well AlGaAs diode laser master oscillator - power amplifier (MOPA) systems were examined both experimentally and theoretically. For two pass operation, it was found that powers in excess of 0.3 W per 100 micrometers of facet length were achievable while maintaining diffraction-limited beam quality. Internal electrical-to-optical conversion efficiencies as high as 25 percent were observed at an internal amplifier gain of 9 dB. Theoretical modeling of multiple quantum well amplifiers was done using appropriate rate equations and a heuristic model of the carrier density dependent gain. The model gave a qualitative agreement with the experimental results. In addition, the model allowed exploration of a wider design space for the amplifiers. The model predicted that internal electrical-to-optical conversion efficiencies in excess of 50 percent should be achievable with careful system design. The model predicted that no global optimum design exists, but gain, efficiency, and optical confinement (coupling efficiency) can be mutually adjusted to meet a specific system requirement. A three quantum well, low optical confinement amplifier was fabricated using molecular beam epitaxial growth. Coherent beam combining of two high power amplifiers injected from a common master oscillator was also examined. Coherent beam combining with an efficiency of 93 percent resulted in a single beam having diffraction-limited characteristics. This beam combining efficiency is a world record result for such a system. Interferometric observations of the output of the amplifier indicated that spatial mode matching was a significant factor in the less than perfect beam combining. Finally, the system issues of arrays of amplifiers in a coherent beam combining system were investigated. Based upon experimentally observed parameters coherent beam combining could result in a megawatt-scale coherent beam with a 10 percent electrical-to-optical conversion efficiency.
Andrews, John R.↗