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Chalcogenide-based Mid-Infrared High-Efficiency Broadband Diffraction Gratings

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: FA9451-22-P-A005
Agency Tracking Number: F221-0006-0086
Amount: $149,993.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: AF221-0006
Solicitation Number: 22.1
Solicitation Year: 2022
Award Year: 2022
Award Start Date (Proposal Award Date): 2022-09-27
Award End Date (Contract End Date): 2023-06-30
Small Business Information
44 Hunt Street
Watertown, MA 02472-1111
United States
DUNS: 073804411
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Oleg Maksimov
 (617) 668-6934
Business Contact
 Martin Waters
Phone: (617) 668-6851
Research Institution

Development of ultra-short pulse laser (USPL) system operating in the mid-infrared (MIR) region is an important priority towards the advancement of Directed Energy (DE) applications within the US military. However, to realize the MIR USPL system for DE applications, there is a need to achieve a laser pulse compression below 100 femtoseconds for a laser > 10 mJ power in the 3-5 µm frequency range. This can be accomplished with a broadband diffraction grating with high efficiency in the MIR frequencies, however such gratings are yet to be demonstrated successfully on a manufacturing scale. This is attributed to lack of reliable fabrication technique using the material systems suitable for MIR frequency range. RMD Inc. proposes to address this problem by exploring the design, fabrication, and manufacturability of a special class of broadband high-efficiency diffraction gratings based on metasurfaces- hereafter referred to as “metagratings”. A critical innovation that will enable metagratings for the MIR frequency is the conformal coating of high refractive index chalcogenide layers grown by Atomic Layer Deposition (ALD). Our choices of the material, device design and processing route are uniquely defined by the performance targets specified in the call and present a technical solution that can scaled to other wavelengths, device architectures, and optical functions.

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