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Multiphoton Upconversion Emission from Diamond Single Crystals.

Yunfeng Wang1, Wenfei Zhang2, Chao-Nan Lin3

  • 1Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong , China.

ACS Applied Materials & Interfaces
|May 18, 2018
PubMed
Summary
This summary is machine-generated.

Diamond single crystals exhibit room-temperature upconversion emission via eight-photon absorption for the first time. This demonstrates their potential for high-power deep ultraviolet applications due to unique nonlinear optical properties.

Keywords:
diamond single crystalsnonlinear optical absorptionnonlinear opticsphotoluminescenceupconversion emission

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Solid State Physics

Background:

  • Diamond's unique properties make it a candidate for advanced optical applications.
  • Understanding nonlinear optical phenomena in diamond is crucial for harnessing its potential.

Purpose of the Study:

  • To demonstrate room-temperature upconversion emission in diamond single crystals.
  • To investigate the nonlinear optical properties of diamond under multiphoton excitation.
  • To explore diamond's suitability for high-power deep ultraviolet applications.

Main Methods:

  • Femtosecond laser excitation was used to induce upconversion emission.
  • Open-aperture Z-scan technique was employed to measure nonlinear optical properties.
  • Photon absorption coefficients were determined for three-, five-, and eight-photon absorption.

Main Results:

  • Room-temperature upconversion emission up to eight-photon absorption was observed for the first time.
  • The emission is supported by free excitons at 235 nm, attributed to low defect concentration.
  • Nonlinear optical coefficients for three-, five-, and eight-photon absorption were quantified.

Conclusions:

  • Diamond single crystals exhibit significant multiphoton absorption capabilities.
  • Their robust physical properties and demonstrated nonlinear optical behavior position them as versatile materials.
  • Diamond is suitable for high-power deep ultraviolet applications under multiphoton excitation.