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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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A distance meter using a terahertz intermode beat in an optical frequency comb.

Shuko Yokoyama1, Toshiyuki Yokoyama, Yuki Hagihara

  • 1Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan. yokoyama@sml.me.es.osaka-u.ac.jp

Optics Express
|November 13, 2009
PubMed
Summary

This study introduces a novel terahertz frequency comb distance meter for high-resolution absolute distance measurements. The innovative multiheterodyne cross-correlation detection achieves precise measurements with micrometer accuracy.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Terahertz Technology

Background:

  • Accurate distance measurement is crucial in various scientific and industrial applications.
  • Traditional methods face limitations in resolution and dynamic range for absolute measurements.
  • Optical frequency combs offer precise frequency standards for metrology.

Purpose of the Study:

  • To develop a high-resolution, high dynamic range absolute distance measurement system.
  • To utilize terahertz (THz) frequency combs for advanced metrology.
  • To demonstrate a novel detection method for enhanced measurement precision.

Main Methods:

  • Implementation of a distance meter employing intermode beats from a terahertz optical frequency comb.
  • Development and application of multiheterodyne cross-correlation detection.
  • Optical mixing of two detuned optical frequency combs using a nonlinear optical crystal to down-convert THz beat frequencies to radio frequencies.

Main Results:

  • Achieved a 1.056 THz intermode beat frequency.
  • Demonstrated a distance resolution of 0.820 micrometers through phase measurement.
  • Performed absolute distance measurements within a 10 mm range with a precision of 0.688 micrometers using 1.056 THz and 8.187 GHz beats.

Conclusions:

  • The proposed terahertz frequency comb distance meter enables high-resolution and high dynamic range absolute distance measurements.
  • Multiheterodyne cross-correlation detection is an effective method for precise metrology in the terahertz domain.
  • The system shows significant potential for applications requiring accurate length metrology.