Description
High-performance supermirrors are employed in a variety of applications in optics and photonics: They are a key element for stable optical cavities, which are routinely used to narrow the linewidth of continuous-wave lasers, thereby creating optical references for frequency comb stabilization and precision spectroscopy. Furthermore, they are a vital component for optical interferometers, which enable scientific discovery in fields as seemingly unrelated as microcavity sensing and gravitational wave detection.Especially at mid-infrared wavelengths, emerging applications in chemical sensing, discrete imaging, ultracold chemistry, and even fundamental physics will benefit immediately from high-performance mirrors. Therefore, the development of low-loss mirrors in this wavelength range is a long-standing goal. However, traditional techniques for the fabrication of high-reflectivity mirrors fail to match the performance readily accessible in the visible and near-infrared wavelength range.
In recent years, substrate-transferred monocrystalline supermirrors have emerged as a promising technology to overcome these limitations. Originally developed as a means to overcome the Brownian-noise limit in precision near-infrared interferometry, crystalline mirrors also exhibit extremely low absorption and scatter losses over their entire transparency window (0.87 µm to 10 µm). This enables supermirror-level reflectivity at mid-infrared wavelengths.
In this highlight talk we will take a look at the key features and wide range of applications of these crystalline Bragg reflector mirrors. Building on this framework, I will also present our achievements in precision characterization and design improvements, including the recent demonstration of unprecedentedly high-reflectivity mirrors at 4.45 µm. Finally, I will give an outlook on ongoing and future efforts.
Period | 21 Oct 2022 |
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Event title | VDSP Science Day |
Event type | Other |
Location | Wien, AustriaShow on map |
Degree of Recognition | Regional |
Keywords
- Spectroscopy
- Materials Science
- Physics
- Optics
- Photonics
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Publications
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High-Accuracy Measurement of Mid-IR Refractive Indices of GaAs/AlGaAs in Thin-Film Multilayers
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High-Performance Mid-Infrared Crystalline Bragg Mirrors at 4.5 µm
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Progress Towards a > 100,000 Finesse Optical Cavity at 4.5 µm
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High-Performance Mid-Infrared Crystalline Bragg Mirrors at 4.5 µm
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High-Performance Mid-Infrared Crystalline Bragg Mirrors at 4.5 µm
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High-Accuracy Measurement of Mid-IR Refractive Indices of GaAs/AlGaAs in Thin-Film Multilayers
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Mid-Infrared Crystalline Supermirrors for Optical Cavities with 231 000 Finesse
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Progress towards a 100 000 finesse optical cavity in the mid-infrared
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Mid-infrared supermirrors with finesse exceeding 400 000
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Mid-infrared interference coatings with excess optical loss below 10 ppm
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Substrate-transferred stacked optical coatings
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Broadband Reflectance and Transmittance Characterization of Crystalline Supermirrors
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Simultaneous measurement of mid-infrared refractive indices in thin-film heterostructures: Methodology and results for GaAs/AlGaAs
Publications: Contribution to journal › Article › Peer Reviewed
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Activities
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2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC 2023)
Activity: Academic events › Participation in ...
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Ultrahigh finesse mid-IR cavities exceeding 400,000 at 4.5 μm for trace gas sensing
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VDSP Science Day
Activity: Academic events › Participation in ...
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Mid-Infrared Crystalline Supermirrors for Optical Cavities with 231 000 Finesse
Activity: Talks and presentations › Talk or oral contribution › Science to Science
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Laser World of Photonics 2023
Activity: Academic events › Participation in ...
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High-Accuracy Measurement of Refractive Indices in GaAs/AlGaAs Thin-Film Heterostructures
Activity: Talks and presentations › Talk or oral contribution › Science to Science
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Projects
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Christian Doppler Laboratory for Mid-IR Spectroscopy and Semiconductor Optics
Project: Research cooperation
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Press/Media
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Kristalline Superspiegel zur Spurengasdetektion in Medizin und Umweltwissenschaften
Press/Media: Public Engagement Activities