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Diamond mirrors for high-power continuous-wave lasers.

Haig A Atikian1, Neil Sinclair1,2, Pawel Latawiec1

  • 1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 01238, USA.

Nature Communications
|May 11, 2022
PubMed
Summary

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This summary is machine-generated.

Researchers developed new diamond-based mirrors that withstand high-power continuous-wave (CW) lasers without damage. These novel optics overcome limitations of conventional mirrors, enabling advanced laser applications in industry and medicine.

Area of Science:

  • Materials Science
  • Optics
  • Laser Technology

Background:

  • High-power continuous-wave (CW) lasers are crucial for industry, medicine, communications, and defense.
  • Conventional optical components, often multi-layer dielectric coatings, are susceptible to thermal damage from high-power CW laser irradiation.
  • This damage limits laser system performance, application scope, and increases costs.

Purpose of the Study:

  • To demonstrate novel, damage-resistant monolithic mirrors for high-power CW laser applications.
  • To overcome the limitations imposed by thermal loading on conventional optics.
  • To introduce a new class of optical components capable of operating under extreme laser conditions.

Main Methods:

  • Fabrication of monolithic mirrors by etching nanostructures into single-crystal diamond surfaces.

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  • Characterization of optical properties, including reflectivity.
  • Testing mirror performance under high-power CW laser irradiation (10 kW at 1070 nm).

    • Main Results:

    • Achieved reflectivities greater than 98% with the nanostructured diamond mirrors.
    • Demonstrated damage-free operation under 10 kW CW laser illumination at 1070 nm, focused to a 750 μm spot.
    • Conventional dielectric mirrors showed significant damage under identical test conditions.

    Conclusions:

    • Single-crystal diamond mirrors with etched nanostructures offer a robust solution for high-power CW laser optics.
    • These mirrors exhibit superior performance and damage resistance compared to conventional optics.
    • This innovation paves the way for improved and novel applications of high-power lasers.