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Mid-infrared interference coatings with excess optical loss below 10 ppm.

G Winkler1, L W Perner1, G-W Truong2,3

  • 1Christian Doppler Laboratory for Mid-IR Spectroscopy and Semiconductor Optics, Faculty Center for Nano Structure Research, Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.

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We developed new single-crystal GaAs/AlGaAs mirrors with record-low optical loss (<10 ppm) using a novel microfabrication process. These high-reflectivity mirrors enable advanced mid-infrared applications.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Traditional amorphous multilayers produced via physical vapor deposition (PVD) exhibit limitations in optical loss.
  • Achieving ultra-low optical loss is critical for high-performance optical resonators and sensitive measurements.

Purpose of the Study:

  • To present high-reflectivity substrate-transferred single-crystal GaAs/AlGaAs interference coatings.
  • To demonstrate a novel microfabrication process for achieving record-low optical loss.
  • To explore the potential of these coatings for mid-infrared applications.

Main Methods:

  • Fabrication of single-crystal GaAs/AlGaAs interference coatings using a novel microfabrication process.
  • Optical loss characterization using cavity ring-down, transmittance spectroscopy, and direct absorption tests.
  • Investigation of polarization-orientation-dependent loss mechanisms.

Main Results:

  • Achieved record-low excess optical loss below 10 parts per million (ppm) at a 4.54 micrometer center wavelength.
  • Demonstrated reduced scatter loss due to low surface and interfacial roughness.
  • Observed a unique polarization-orientation-dependent loss attributed to elastic anisotropy.

Conclusions:

  • The novel microfabrication process enables high-performance mirrors with significantly reduced optical loss compared to PVD methods.
  • These mirrors are suitable for developing optical resonators with finesse exceeding 100,000 in the mid-infrared.
  • Potential applications include high-resolution spectroscopy, laser stabilization, and ultrasensitive light-matter interaction measurements.