Broadband Near IR Laser Hazard Filters
Abstract
Ocular protection against laser radiation and ballistic fragments is required for military aviators and ground personnel. Protection against laser radiation in several laser hazard and threat wavelength regions is required to prevent ocular injury from existing potentially hazardous systems. The laser hazard and threat wavelengths extend from the ultraviolet through the near infrared. There is potential for a cost effective protection against fixed wavelength threats utilizing narrow-band holographic reflection filters for the visible portion of the spectrum. The IR portion of the spectrum can also be fully protected, by using the broad-band holographic filters that were being developed and tested during the first year of this program. POC's concept of broad-band near IR reflection filter fabrication in based on volume Bragg holography using photopolymers and dichromated gelatins. The successful performance of broad-band IR filters depends upon the survivability of their optical material (in this case, photopolymer or dichromated gelatin or a modified and/or composite graft of gelatin and polymer). As a result, chemical modifications to dichromated gelatin (DCG) through synthesis and chemical wet processing, can produce DCG based broad-band filters which are very stable to environmental changes of temperature, pressure, sunlight, etc.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 10, 1992
- Accession Number
- ADB171686
Entities
People
- Gajendra Savant