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Laser protection system with thermally fixed hidden gratings

Award Information
Agency: Department of Defense
Branch: Navy
Contract: M67854-11-C-0228
Agency Tracking Number: N111-001-1652
Amount: $80,000.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: N111-001
Solicitation Number: 2011.1
Solicitation Year: 2011
Award Year: 2011
Award Start Date (Proposal Award Date): 2011-09-17
Award End Date (Contract End Date): N/A
Small Business Information
6F Gill Street
Woburn, MA -
United States
DUNS: 114584175
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Jingwen Zhang
 Sr. Staff Scientist
 (781) 935-2800
Business Contact
 Yingyin Zou
Title: President
Phone: (781) 935-2800
Research Institution

This project aims at developing a non focal plane laser protection system consisted of single crystal plates with hidden phase gratings, which can be revealed with exposure to strong laser pulse, and a novel optical shutter based device that follows. The protection system is large in aperture, broad in transparent window (400 nm to 2000 nm) and in field of view, and wavelength-insensitive. The protection system is capable of changing from a high transmission state (60%) to a very low transmission state (35 C 40 dB) to block light pulse within short time scale (subnanosecond). Combining phase gratings and charge compensation technique, the unique protection system has ample transmission of ambient visible light and of high optical quality in off-state, without notably degrading normal (human) vision. In the entire interesting visible waveband in this topic, even higher transmittance is anticipated with efforts on deposition of AR coatings. When harmful radiation is no longer incident, the device can recover to a high transmission state in a short time scale (microseconds) so that the users vision is not interrupted or significantly degraded after exposure. The BATis expertise in ultrafast optics, photorefraction and material fabricating and processing will meet or exceed the requirements in performance of the proposed work.

* Information listed above is at the time of submission. *

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