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MLD TECHNOLOGIES LLC
Map2672 Bayshore Pkwy.
Suite 701
Mountain View, CA 94043
United States
Phone: +1 650-938-4485
Fax: +1 650-938-3113

Atomic Layer Deposition

Photonics Buyers' GuideAtomic Layer DepositionOptical coatings made by Atomic Layer Deposition possess a unique combination of properties. Like IBS coatings, each layer is stoichiometric and has a fully dense micro-structure. But ALD is also a conformal process, resembling conventional CVD, only with greater thickness control due to the nature of the film growth. ALD can be used to coat optics of any shape with metal oxide multilayer stacks or single-layer protective coatings. MLD has developed ALD systems to address the market need for conformal, highly precise and chemical resistant optical coatings.

Our Atomic Layer Deposited coatings may be applied to optics ranging from 5 mm to 800 mm in diameter. Single layer thickness varies less than ± 1% over the entire surface. Total loss is typically less than 50 ppm. Because ALD films are grown one monolayer at a time from the chemical reaction of gas-phase precursors, pin-hole free coverage is achieved with every film layer. Thus ALD interference coatings double as a barrier for certain environments.

MLD can also produce hybrid coatings, comprised of IBS layers in combination with ALD layers. These hybrid coatings are critical, for example, when fabricating high-energy laser mirrors or other precision optics which may be exposed to harsh chemical or corrosive environments.

CHARACTERISTICS
   •  Conformal
   •  Fully dense films
   •  Stoichiometric films

BENEFITS
   •  Pinhole free
   •  Survive wet or corrosive environments
   •  Moisture and/or chemical barrier
   •  Coat optics up to 800 mm diameter
   •  Negligible VAC-AIR shift
   •  Ultra precise layer thickness control

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