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TRACEABILITY OF 633 nm LASER CALIBRATION AT NIMT

Monludee Ranusawud, Ketsaya Vacharanukul, Anusorn Tonmueanwai
  • Abstract:
    The National Institute of Metrology (Thailand), NIMT, maintains the standard of length in accordance with the definition of the meter through a 633 nm iodine stabilized He-Ne laser. Its accuracy is transferred to stabilized and non-stabilized lasers regarding to beat-frequency method and direct measurement using a wavelength meter, respectively. The traceability in wavelength measurement at the NIMT is discussed here. The iodine stabilized He-Ne laser is self-calibrated using the master and slave beat frequency system. NIMT participated in APMP.L-K11 intercomparison and the results are presented. The standard uncertainty is 2.5 × 10-11.
  • Keywords:
    iodine stabilized He-Ne laser, beat frequency method, traceability
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  • DOI:
    _unreg_wc-2009.158

Event details:

  • IMEKO TC:
  • Event name:
    XIX IMEKO World Congress
  • Title:

    Fundamental and Applied Metrology

  • Place:
    Lisbon, PORTUGAL
  • Time:
    06 September 2009 - 11 September 2009