Vol. 22 No. 2 (2012)
Papers

Precision Frequency Measurement for He-Ne/ I<SUB>2</SUB> Laser Emission with kHz- Accuracy

Le Huu Thang
Vietnam Metrology Institute – Ministry of Science and Technology
Bui Quoc Thu
Vietnam Metrology Institute – Ministry of Science and Technology
Vu Khanh Xuan
Vietnam Metrology Institute – Ministry of Science and Technology
Ho Suhng Suh
Korea Research Institute of Standards and Science

Published 01-08-2012

Keywords

  • Primary standard of length,
  • He-Ne/I$_{2 }$laser,
  • frequency stabilized laser,
  • heterodyne beat,
  • Hyperfine structure.

How to Cite

Thang, L. H., Thu, B. Q., Xuan, V. K., Suh, H. S., & Hoi, P. V. (2012). Precision Frequency Measurement for He-Ne/ I<SUB>2</SUB> Laser Emission with kHz- Accuracy. Communications in Physics, 22(2), 161. https://doi.org/10.15625/0868-3166/22/2/1615

Abstract

An accurate and precise frequency measurement of S.I. unit traceability is essential not only in the field of frequency metrology but also in many fundamental scientific researches, because an accurate and precise frequency will be able to provide stable reference frequency related quantities like length and time -- the two important elements of physics. In this paper we present our frequency measurement for laser emission of the He-Ne/I2 laser system at the kHz accuracy and precision level. A frequency beat measurement of the laser under test with the standard frequency from a frequency optical comb is conducted. The second measurement method based on the heterodyne technique, where the beats between the hyperfine frequencies of 127I2 isotope at frequency of 474 THz and the testing He-Ne laser frequency recorded. The measurement data from different measurement techniques show a good consistency and therefore the given data are reliable.

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