NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Heterodyne interferometer with subnanometer accuracy
Published
Author(s)
Darine El Haddad, Frank C. Seifert, Stephan Schlamminger, Leon S. Chao, David B. Newell, Jon R. Pratt
Abstract
This paper gives a brief description of the laser interferometer system designed for the next generation watt balance experiment aimed to realize the unit of mass by direct link to Planck constant at the National Institute of Standards and Technology. The light source is an iodine-stabilized frequency-doubled Nd:YAG laser at λ=532nm. Three heterodyne interferometers with subnanometer non-linearity errors measure the angular and the vertical displacements of the induction coil.
Proceedings Title
CPEM 2014 Digest
Conference Dates
August 24-29, 2014
Conference Location
Rio de Janeiro
Conference Title
Conference on Precision Electromagnetic Measurements
El, D.
, Seifert, F.
, Schlamminger, S.
, Chao, L.
, Newell, D.
and Pratt, J.
(2014),
Heterodyne interferometer with subnanometer accuracy, CPEM 2014 Digest, Rio de Janeiro, -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915347
(Accessed October 11, 2025)