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Amorphous oxide interference coatings for multi-gigashot lifetime for inertial fusion energy laser drivers

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-SC0023878
Agency Tracking Number: 272601
Amount: $200,000.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: C56-32a
Solicitation Number: N/A
Timeline
Solicitation Year: 2023
Award Year: 2023
Award Start Date (Proposal Award Date): 2023-07-10
Award End Date (Contract End Date): 2024-04-09
Small Business Information
PO BOX273251
Fort Collins, CO 80525-3251
United States
DUNS: 962222027
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Carmen Menoni
 (970) 215-9210
 csmenoni@xuvlasers.com
Business Contact
 Francey Aubuchon
Phone: (770) 654-5638
Email: faubuchon@xuvlasers.com
Research Institution
 Colorado State University
 Michael Lang
 
601 S Howes STE 500
Fort Collins, CO 80523-2002
United States

 Nonprofit College or University
Abstract

The demonstration of fusion ignition at the National Ignition Facility at Lawrence Livermore National Laboratory in December 2022 is a key milestone towards the implementation of Inertial Fusion Energy (IFE) as an inexhaustible source of clean energy. This remarkable achievement sets a path to fusion power plants in which new high repetition rate IFE laser drivers will be needed to make laser fusion practical. Different IFE driver architectures could be used for laser fusion. However, in all of these systems the ability to operate at high energy, with high average power (high repetition rate) over multi-giga-shots exposure is in part limited by the damage of coatings in critical beam transport and focusing optics. How we propose to address the problem/ situation in Phase I: XUV Lasers Inc. in collaboration with Colorado State University proposes to address the scaling in the laser damage resistance of coatings for an operational wavelength ? =355 nm; nominal pulse duration <10 nsec, through an investigation of novel amorphous oxide materials for transmissive and reflective coatings. The innovative aspects of the proposed research will be: i) in the use of amorphous oxide mixtures and nanolaminate structures deposited by sputtering which will substitute the more-prone to damage layers in the coating; and ii) in tailoring the substrate/coating interface, which plays a critical role in the coatings’ adhesion and laser damage, to enhance their lifetime. Experiments to test laser damage resistance at ? = 355 nm, with a pulse duration of ~10 ns, and over multi-shot exposure will allow us to identify the most promising coating materials and coating architectures. Commercial applications and other benefits: The knowledge developed through this project will impact the engineering of interference coatings based on amorphous oxides for applications in IFE lasers in particular and broadly for high intensity lasers being used in large and medium frame DoE laser facilities.

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

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