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Substrate-transferred crystalline coatings have recently emerged as agroundbreaking new concept in optical interference coatings. Building upon ourinitial demonstration of this technology, we have now realized significantimprovements in the limiting optical performance of these novel single-crystal$GaAs/Al_{x}Ga_{1-x}As$ multilayers. In the near-infrared (NIR), for coatingcenter wavelengths spanning 1064 to 1560 nm, we have reduced the excess opticallosses (scatter + absorption) to levels as low as 3 parts per million, enablingthe realization of a cavity finesse exceeding $3\times 10^{5}$ at thetelecom-relevant wavelength range near 1550 nm. Moreover, we demonstrate thedirect measurement of sub-ppm optical absorption at 1064 nm. Concurrently, weinvestigate the mid-IR (MIR) properties of these coatings and observeexceptional performance for first attempts in this important wavelength region.Specifically, we verify excess losses at the hundred ppm level for wavelengthsof 3300 and 3700 nm. Taken together, our NIR optical losses are now fullycompetitive with ion beam sputtered multilayer coatings, while our firstprototype MIR optics have already reached state-of-the-art performance levelsfor reflectors covering this portion of the fingerprint region for optical gassensing. Mirrors fabricated with our crystalline coating technique exhibit thelowest mechanical loss, and thus the lowest Brownian noise, the highest thermalconductivity, and, potentially, the widest spectral coverage of any"supermirror" technology in a single material platform. Looking ahead, we see abright future for crystalline coatings in applications requiring the ultimatelevels of optical, thermal, and optomechanical performance

High-performance near- and mid-infrared crystalline coatings