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Electronics

Optoelectronics

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Displaying 276 - 300 of 389

Accurate color measurement methods for medical displays

February 15, 2007
Author(s)
Anindita Saha, Hongye Liang, Aldo Badano, Edward F. Kelley
We report on the characterization of two novel probes for measuring display color without contamination from other screen areas or off-normal emissions. The probes are characterized using a scanning slit method and a moving laser and LED arrangement. The

Reflections on Sunlight-or Daylight-Readability

January 1, 2007
Author(s)
Edward F. Kelley
Trade magazine discussion of the need for better sunlight-readability measurement methods based upon ambient contrast measurements. Diffuse reflectance measurements and directed illumination measurements are combined and scaled to daylight levels to

Quantum dot single photon sources studied with superconducting single photon detectors

November 1, 2006
Author(s)
Martin J. Stevens, Robert Hadfield, Robert E. Schwall, Sae Woo Nam, Richard P. Mirin
We report the observation of photon antibunching from a single, self-assembled InGaAs quantum dot (QD) at temperatures up to 135 K. The second-order intensity correlation, g(2)(0), is less than 0.260 ± 0.024 for temperatures up to 100 K. At 120 K, g(2)(0)

Improved Thermal Detector Coatings for Laser Radiometry at NIST

February 27, 2006
Author(s)
John H. Lehman
Nearly all of the radiometric standards for laser power and energy measurements at NIST and elsewhere in the world are based on thermal detectors. These detectors usually rely on a thermal absorber coating to enhance the detector responsivity. Ideally the

The Next Generation of Laser Radiometry at NIST

February 27, 2006
Author(s)
John H. Lehman, Christopher L. Cromer, Marla L. Dowell
High accuracy laser radiometry is on the verge of significant improvements just as new laser technologies are evolving. Our present tasks are directed toward anticipating and meeting the measurement needs in two areas; higher power and shorter wavelengths

Application of carbon nanotube coatings for laser measurements

October 17, 2005
Author(s)
John H. Lehman, Paul Rice, Natalia Varaksa, Chaiwat Engtrakul, Anne Dillon
We have demonstrated coatings based on carbon nanotubes (CNTs) on a variety of detector platforms for laser power and energy measurement standards. These coatings must be resistant to damage and aging while maintaining desirable optical and thermal

Importance of Display Metrology in a Competitive World

April 26, 2005
Author(s)
Edward F. Kelley
How do contrast, brightness, viewing angle, and other parameters affect the quality of a display? Do the specifications always tell you what you want to know? Is specsmanship a problem? Why is a solid bedrock of display metrology important for the highly
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