Phase-shifting interferometry to determine the absolute diameter of a silicon sphere using a frequency-tunable diode laser

Xuejian Wu, Yan Li, Haoyun Wei, Jitao Zhang

Research output: Contribution to conferencePaperpeer-review

Abstract

In order to redefine the kilogram, the Avogadro constant is determined by means of the X-ray crystal density method, where the lattice constant, density and mean molar mass of a single crystal silicon sphere are absolutely measured [1]. The density of the silicon sphere, whose diameter and mass are approximately 93.6 mm and 1 kg respectively, is obtained by the accurate diameter and mass. To measure the absolute diameter, laser interferometry is the most promising method with nanometer resolutions and traceable measurement results. However, the 2π ambiguity range limits the measurement range. In this contribution, a chain of temporal synthetic wavelengths, generated by use of a frequency-tunable diode laser calibrated by an optical frequency comb, is used to measure the absolute diameter with an accuracy of 3 nm in air, where the fractional interference phase is measured by phase-shifting interferometry.

Original languageEnglish (US)
DOIs
StatePublished - 2013
Externally publishedYes
Event2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013 - Munich, Germany
Duration: May 12 2013May 16 2013

Conference

Conference2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013
Country/TerritoryGermany
CityMunich
Period5/12/135/16/13

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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