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Crystalline Mirrors

High-reflectivity optical coatings are key components in a wide variety of laser-based applications. With continued advancement in laser performance, state-of-the-art optical coatings have now become a major limitation, particularly in the areas of laser-based manufacturing and precision optical metrology and instrumentation.

Substrate-transferred crystalline coatings represent a game-changing technology that enables the integration of single-crystal films onto arbitrary, including curved, optical substrates. For the first time, the unique properties of monocrystalline semiconductor materials can be exploited for the construction of high-performance laser optics. This technological breakthrough enables new performance metrics for existing optical systems, as well as enabling the development of radically new application areas in communications, sensing, and manufacturing.

The merger of advanced microfabrication techniques with bulk optical technology has culminated in the development of “Semiconductor Supermirrors” with 3 key performance advantages:
=>> 10X LOWER Brownian noise
=>> 10X LOWER mid-IR absorption
=>> 30X thermal resistivity

1. Xtal custom
- Fully customized solutions for direct-bonded components
- Example materials: Fused silica, Si, GaAs, Sapphire, SiC, Diamond, YAG, YVO4, Ti:Sapphire, etc.
- Surface quality requirements: Micro-roughness < 1 nm; bow/warp < 10 μm: P-V height variation < 100 nm
- Size: <5mm =>> 200mm
- Thickness: >1um =>> 30mm
- Radius of Curvature: Thickness dependent, ≥1 cm

2. Xtal stable
- Ultralow-loss and ultrastable coatings, 10 × lower Brownian noise
- Center wavelength: 900 ~ 2000 nm
- Optical absorption: < 1 ppm
- Optical scatter: < 5 ppm
- Radius of Curvature: >10 cm

3. Xtal mir
- Ultralow-loss single-crystal coatings, 10 × lower mid-infrared absorption
- Center wavelength: 2 ~ 5+ μm
- Optical losses: < 10 ppm (scatter + absorption)
- Bandwidth : 200 ~ 400 nm FWHM

4. Xtal therm
- Thermally optimized optics, 30 × lower thermal resistivity
- Semiconductor films bonded to high thermal conductivity substrates
- Center wavelength: 900 ~ 5000 nm (Other specifications)
- Optical losses: < 5 ppm (scatter + absorption)
- Coating thermal conductivity: > 30 Wm-1K-1