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What is a Neutral Density Filter?

A neutral density or ND optical filter reduces or modifies the intensity of all wavelengths or colors of light equally, therefore providing for no changes in the hue of the color rendition. Neutral density filters can be colorless or clear, or they can be grey in...

Hot Mirror vs. Cold Mirror

Hot and cold mirrors “heat control filters” are types of dichroic filters used to remove unwanted energy from a light emitting source. Hot Mirror A hot mirror is a dichroic filter that reflects 90% of near infrared (NIR) and infrared (IR) light while transmitting up...

Metallic Mirror Coatings

Abrisa Technologies can deposit a wide variety of precious and non-precious metals onto glass substrates depending upon the application requirement. Metal mirror coatings are often used in systems where a very broadband reflector or beam splitter is needed. Metal...

What is a Thin Film Optical Coating?

Thin film optical coatings are applied to optical substrates such as glass to alter or change its optical properties. The coating is applied in extremely thin layers to the surface and the number of coatings and the thickness of the coating is done to effect a...