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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Method with a phase object for measurement of optical nonlinearities.

Junyi Yang1, Xueru Zhang, Yuxiao Wang

  • 1School of Physical Science and Technology, Soochow University, Suzhou 215006, China.

Optics Letters
|August 18, 2009
PubMed
Summary

A novel method simplifies the measurement of nonlinear optical properties. This technique allows for convenient determination of nonlinear absorption and refraction using a phase object and transmittance measurements.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Nonlinear optical (NLO) properties are crucial for advanced optical devices.
  • Accurate characterization of NLO coefficients, including nonlinear absorption and refraction, is essential.
  • Existing techniques can be complex or require specialized equipment.

Purpose of the Study:

  • To introduce a new, simple, and convenient technique for investigating nonlinear optical properties.
  • To enable the simultaneous determination of nonlinear absorption coefficient and nonlinear refraction index.
  • To demonstrate the technique's efficacy using Zinc Selenide (ZnSe) as a test material.

Main Methods:

  • A phase object is incorporated into the optical measurement system.
  • The transmittance of the sample is measured.
  • The nonlinear absorption coefficient and nonlinear refraction index are calculated from the transmittance data.
  • Pulsed laser excitation at 532 nm with 19 ps pulse duration was used.

Main Results:

  • The developed technique allows for convenient measurement of both nonlinear absorption and refraction.
  • The nonlinear optical properties of ZnSe were successfully investigated using this method.
  • The simplicity of the technique facilitates routine characterization.

Conclusions:

  • The presented technique offers a straightforward and efficient approach for characterizing nonlinear optical properties.
  • This method is suitable for determining key NLO parameters like nonlinear absorption and refraction.
  • The technique is validated by its application to ZnSe, showing its practical utility.