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Search Publications by: John H. Lehman (Fed)

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Displaying 151 - 163 of 163

Comparison of Optical-Power Meters Between the NIST and the PTB

October 1, 2000
Author(s)
Igor Vayshenker, Holger Haars, John H. Lehman, David J. Livigni
We describe the results of a comparison of optical-power meters undertaken by the National Institute of Standards and Technology (NIST, USA) and the Physikalisch-Technische Bundesanstalt (PTB, Germany) at nominal wavelengths of 1300 nm and 1550 nm. Both

Optical Tunnel-Trap Detector for Radiometric Measurements

October 1, 2000
Author(s)
John H. Lehman, Christopher L. Cromer
We have designed and evaluated an optical trap detector that is simple to fabricate and convenient to use. The trap geometry is a triangular tube similar to a kaleidoscope, with two photodiodes in place of a mirror on each side. One version incorporates

Domain-Engineered Pyroelectric Radiometer

December 1, 1999
Author(s)
John H. Lehman, George P. Eppeldauer, J A. Aust, M. Racz
We built a large-area domain-engineered pyroelectric radiometer with high spatial and spectral response uniformity that is an excellent primary transfer standard for measurements in the near- and the mid-infrared wavelength regions.

Cool It!

March 1, 1988
Author(s)
John H. Lehman

Development of a miniature radiation pressure-measuring microscale

Author(s)
Ivan Ryger, Alexandra B. Artusio-Glimpse, Paul A. Williams, Nathan A. Tomlin, Michelle S. Stephens, Matthew T. Spidell, John H. Lehman
Traditional methods for accurate measurement of high-power lasers involve total absorption of the laser light [1]. Our method, however, measures photon pressure exerted on a mirror without obstruction of the laser beam. The technique enables in situ

Feedback control of a nonlinear electrostatic force transducer

Author(s)
Ivan Ryger, Stefan Chamraz, Richard Balogh, Alexandra B. Artusio-Glimpse, Michelle S. Stephens, John H. Lehman, Paul A. Williams
In this article, we document a design process for a feedback controller for a nonlinear electrostatic transducer that exhibits a strong unloaded resonance. This is being used for precision optical power measurement by means of a photon force measurement
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