Religionswissenschaft

Kippenberg, Hans G.

doi:10.1007/978-3-476-05332-9_20

Cited by 1 publication

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One interesting example is the demonstration of epitaxial Bragg mirrors based on GaAs/Ba x Ca 1-x F 2 [42]. Recent work on single-crystal fluoride-based whispering-gallery mode resonators has shown the potential for ultralow optical losses in such materials for wavelengths out to 5 µm [43]. Even in the absence of background contamination in the epitaxial growth process, the ultimate long wavelength limit will be set by optical phonon absorption in the crystal structure, which leads to significant losses in the so-called reststrahlen band beyond about 20 µm in GaAs [44].…”

Section: Mid-infrared Crystalline Coatingsmentioning

confidence: 99%

High-performance near- and mid-infrared crystalline coatings

Cole¹,

Zhang²,

Bjork³

et al. 2016

Optica

141

View full text Add to dashboard Cite

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 3×10 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.

show abstract

Section: Mid-infrared Crystalline Coatingsmentioning

confidence: 99%