Accession Number : ADA254394


Title :   Broadband Laser Filter


Descriptive Note : Final rept. 15 Aug 1988 -15 Feb 1989


Corporate Author : BROWN (JOHN A) ASSOCIATES INC BERKELEY HEIGHTS NJ


Personal Author(s) : Brown, John A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254394.pdf


Report Date : 15 Feb 1989


Pagination or Media Count : 25


Abstract : There is a growing need to provide eye protection to military personnel at risk from laser beams, many of which have the ability to blind a person by burning the retina. This program has taken a new approach to protective filters: an optical interference filter that blocks the entire visible spectrum except for three narrow transmission bands, one in the red, one in the green and one in the blue. The new filter blocks all of the currently- identified threat wavelengths as well as some that have not (yet) been identified as threats. The total light transmission is only 6%; and yet, since the wavelengths passed are essentially the primary colors of human vision, vision through the filter is bright and clear and in full natural color. In highway testing behind the wheel of an automobile, visual acuity was excellent; red lights were red; the yellow line was yellow; the blue sky was blue; and white cars were white. But laser threat wavelengths could not be seen.


Descriptors :   *LASER BEAMS , *EYE SAFETY , *WINDSHIELDS , *PROTECTIVE COATINGS , MILITARY PERSONNEL , RISK , HUMANS , ACUITY , LIGHT , LASERS , COMBUSTION , COLORS , BROADBAND , LIGHT TRANSMISSION , INTERFERENCE , SAFETY , PROTECTION , PERSONNEL , RETINA , VISION , EYE , SKY , FILTERS , PASSENGER VEHICLES , HIGHWAYS , VISUAL ACUITY , OPTICAL FILTERS


Subject Categories : Anatomy and Physiology
      Lasers and Masers


Distribution Statement : APPROVED FOR PUBLIC RELEASE