Beam-combinable high-power fiber laser sources for directed energy applications

Roger Holten; Angel Flores; Thomas Ehrenreich; Brian Anderson; Iyad Dajani

doi:10.1117/12.3013096

11 April 2024 Beam-combinable high-power fiber laser sources for directed energy applications

Roger Holten, Angel Flores, Thomas Ehrenreich, Brian Anderson, Iyad Dajani

Proceedings Volume 12939, High-Power Laser Ablation VIII; 129390E (2024) https://doi.org/10.1117/12.3013096
Event: SPIE High-Power Laser Ablation, 2024, Santa Fe, New Mexico, United States

Abstract

We discuss methods and lessons learned during the integration and testing of five individual kW-class fiber amplifiers seeded with pseudorandom phase-modulated light, using a 1x5 Diffractive Optical Element (DOE). Each amplifier is capable of producing approximately 1.2 kW of near diffraction-limited output power (M2 <1.1). Low power samples from each amplifier are used for active polarization control. Phase control of each amplifier was accomplished using a low power combined beam sample and AFRL’s Locking of Optical Coherent via Single-detector Electronic-frequency Tagging (LOCSET) control system. Approximately 5 kW of signal output was achieved with a combined efficiency of 82%. Losses in the system arise from DOE efficiency limitations, Amplified Spontaneous Emission (ASE), polarization errors, uncorrelated wavefront errors, optical path length mismatches, and beam misalignments. We discuss the impact of recent amplifier developments and how these developments impact this beam combining method.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Roger Holten, Angel Flores, Thomas Ehrenreich, Brian Anderson, and Iyad Dajani "Beam-combinable high-power fiber laser sources for directed energy applications", Proc. SPIE 12939, High-Power Laser Ablation VIII, 129390E (11 April 2024); https://doi.org/10.1117/12.3013096

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available