Notch Filters

Often referred to as "negative bandpass filters", Notch Filters provide a relatively narrow band of high reflection within a relatively wide band of high transmission. These filters can perform a number of different functions, but the most common usage is the removal of unwanted laser light. Whether deployed in a laser lab to protect laser technicians and scientists or on a battlefield to protect soldiers from laser rangefinder beams, notch filters effectively reflect the unwanted and often dangerous laser energy away from the user's eyes while allowing them to maintain good visibility of their surroundings.

Notch filters can be manufactured using many different thin-film designs. The specific design that will be utilized will largely depend upon the desired bandwidth (or notch width) required for the application. In most cases, the design will also be directed toward achieving the most realistic color rendition of the environment.

To discuss your specific requirements, please call 508-528-4411 to speak directly to one of our Technical Sales Engineers, or email us at

We design and manufacture custom notch filters and coatings for many different OEM applications including laser safety coatings for Argon, Nd:YAG, Ruby, and other lasers.

Laser Safety