High-performance near- and mid-infrared crystalline coatings
By G. Cole, Wei Zhang, B. Bjork, D. Follman, P. Heu, C. Deutsch, L. Sonderhouse, J. Robinson, C. Franz, A. Alexandrovski and 4 more. 2016
139 citations recorded by the source corpus.
Substrate-transferred crystalline coatings have recently emerged as a groundbreaking new concept in optical interference coatings. Building upon our initial demonstration of this technology, we have now realized significant improvements in the limiting optical performance of these novel single-crystal $GaAs/Al_{x}Ga_{1-x}As$ multilayers. In the near-infrared (NIR), for coating center wavelengths spanning 1064 to 1560 nm, we have reduced the excess optical losses (scatter + absorption) to levels as low as 3 parts per million, enabling the realization of a cavity finesse exceeding $3\times 10^{5}$ at the telecom-relevant wavelength range near 1550 nm. Moreover, we demonstrate the direct measurement of sub-ppm optical absorption at 1064 nm. Concurrently, we investigate the mid-IR (MIR) properties of these coatings and observe exceptional performance for first attempts in this important wavelength region. Specifically, we verify excess losses at the hundred ppm level for wavelengths of 3300 and 3700 nm. Taken together, our NIR optical losses are now fully competitive with ion beam sputtered multilayer coatings, while our first prototype MIR optics have already reached state-of-the-art performance levels for reflectors covering this portion of the fingerprint region for optical gas sensing. Mirrors fabricated with our crystalline coating technique exhibit the lowest mechanical loss, and thus the lowest Brownian noise, the highest thermal conductivity, and, potentially, the widest spectral coverage of any "supermirror" technology in a single material platform. Looking ahead, we see a bright future for crystalline coatings in applications requiring the ultimate levels of optical, thermal, and optomechanical performance
Subfields: Atomic and Molecular Physics, and Optics, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/84ab1007ebf4809e77cd5d872336f33e693bce32
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- A cryogenic silicon interferometer for gravitational-wave detection (2020, background): “AlAs:GaAs is not lattice matched to silicon so must be grown on a GaAs substrate and then lifted off [51] and affixed to the silicon test mass face, a technique yet to be demonstrated for 30 cm diameter coating stacks.”
- Photonic microwave signals with zeptosecond-level absolute timing noise (2016, unknown): “Longer or cryogenic reference cavities 26,27 with crystalline coatings 28 or spectral hole-burning stabilization 29 could lower the phase-noise limit by one order of magnitude.”