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Search Publications by: John R. Lawall (Fed)

Displaying 51 - 75 of 99

Fabry-Perot Metrology for Displacements up to 50 mm

October 16, 2008

Author(s)

John R. Lawall

A system designed to apply Fabry-Perot interferometry to the measurement of displacements is described. Two adjacent modes of a Fabry-Perot cavity are probed, and both the absolute optical frequencies and their difference are used to determine

Laser Doppler vibrometer employing active frequency feedback

September 17, 2008

Author(s)

Akobuije D. Chijioke, John R. Lawall

We present a heterodyne Michelson interferometer for vibration measurement in which feedback is used to obviate the need to unwrap phase data. The Doppler shift of a vibrating target mirror is sensed interferometrically and compensated by means of a

Emission spectrum of a dressed exciton-biexciton complex in a semiconductor quantum dot

July 10, 2008

Author(s)

Andreas Muller, Wei Fang, John R. Lawall, Glenn S. Solomon

The photoluminescence spectrum of a single quantum dot was recorded as a secondary resonant laser optically dressed either the vacuum-to-exciton or the exciton-to-biexciton transitions. High-resolution polarization-resolved measurements using a scanning

The NIST Advance Measurement Laboratory: At the Leading Edge of Measurement Science and Technology

September 20, 2006

Author(s)

C Londono, John R. Lawall, Michael T. Postek, Jack A. Stone Jr., John R. Stoup

The National Institute of Standards and Technology as the U.S. National Metrology Institute has the fundamental responsibility to continuously push the limits of measurement science (metrology) to promote U.S. innovation and industrial competitiveness. In