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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation.

Wijayanti Dwi Astuti1,2, Hiraku Matsukuma1, Masaru Nakao1

  • 1Precision Nanometrology Laboratory, Department of Finemechanics, Tohoku University, Sendai 980-8579, Japan.

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Summary
This summary is machine-generated.

This study introduces a novel optical angle measurement technique using femtosecond laser pulses and lithium niobate crystals. The method achieves a wide measurement range of 10,000 arc-seconds for precise angular detection.

Keywords:
angle measurementfrequency-domain angle measurementmode-locked laserparabolic mirrorsecond harmonic generation

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Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Laser Physics

Background:

  • Accurate angle measurement is crucial in various scientific and industrial applications.
  • Existing methods may have limitations in range or precision.
  • Femtosecond lasers offer unique properties like high peak power and broad spectral bandwidth for advanced optical techniques.

Purpose of the Study:

  • To develop a new optical angle measurement method in the optical frequency domain.
  • To leverage the characteristics of femtosecond laser pulses for enhanced measurement capabilities.
  • To achieve a wide measurable range for angle determination.

Main Methods:

  • Utilizing second harmonic generation (SHG) with a mode-locked femtosecond laser source.
  • Performing theoretical calculations to select optimal nonlinear optical crystals, identifying LiNbO3 (Lithium Niobate).
  • Demonstrating the experimental validity of a parabolic mirror to address chromatic aberration issues in SHG localization.

Main Results:

  • Successful experimental demonstration of the proposed optical angle measurement method.
  • Achieved a wide measurable range of 10,000 arc-seconds.
  • Validated the use of LiNbO3 crystal and parabolic mirror for effective SHG-based angle measurement.

Conclusions:

  • The proposed method offers a robust and precise approach for optical angle measurement.
  • Femtosecond laser-based SHG provides a viable pathway for extending the measurable range in angular detection.
  • This technique has potential applications in fields requiring high-precision angular metrology.