Title :
Heterodyne interferometer with subnanometer accuracy
Author :
Haddad, Darine ; Seifert, Frank ; Schlamminger, Stephan ; Chao, Leon S. ; Newell, David B. ; Pratt, Jon R.
Author_Institution :
Joint Quantum Inst., Univ. of Maryland, Gaithersburg, MD, USA
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 the 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.
Keywords :
angular measurement; balances; coils; displacement measurement; frequency multipliers; laser frequency stability; light interferometers; light sources; neodymium; optical harmonic generation; wattmeters; yttrium compounds; National Institute of Standards and Technology; Nd:YAG; Planck constant; angular measurement; heterodyne interferometer; induction coil; iodine-stabilized frequency-doubled Nd:YAG laser; laser interferometer system; light source; subnanometer nonlinearity error; vertical displacement measurement; watt balance experiment; wavelength 532 nm; Adaptive optics; Frequency modulation; Laser beams; Measurement by laser beam; Optical fibers; Optical interferometry; Planck constant; heterodyne interferometry; non-linearity errors; unit of mass; watt balance;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898299
