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Proceedings Paper

High-average-power diode-pumped Yb:YAG lasers
Author(s): Raymond J. Beach; Eric C. Honea; Steven B. Sutton; Camille M. Bibeau; Jay A. Skidmore; Mark A. Emanuel; Stephen A. Payne; Petras V. Avizonis; R. S. Monroe; Dennis G. Harris
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Paper Abstract

A scaleable diode end-pumping technology for high-average- power slab and rod lasers has been under development for the past several years at Lawrence Livermore National Laboratory (LLNL). This technology has particular application to high average power Yb:YAG lasers that utilize a rod configured gain element. Previously, this rod configured approach has achieved average output powers in a single 5 cm long by 2 mm diameter Yb:YAG rod of 430 W cw and 280 W q-switched. High beam quality (M2 equals 2.4) q-switched operation has also been demonstrated at over 180 W of average output power. More recently, using a dual rod configuration consisting of two, 5 cm long by 2 mm diameter laser rods with birefringence compensation, we have achieved 1080 W of cw output with an M2 value of 13.5 at an optical-to-optical conversion efficiency of 27.5%2. With the same dual rod laser operated in a q-switched mode, we have also demonstrated 532 W of average power with an M2 less than 2.5 at 17% optical-to-optical conversion efficiency. These q-switched results were obtained at a 10 kHz repetition rate and resulted in 77 nsec pulse durations. These improved levels of operational performance have been achieved as a result of technology advancements made in several areas that will be covered in this manuscript. These enhancements to our architecture include: (1) Hollow lens ducts that enable the use of advanced cavity architectures permitting birefringence compensation and the ability to run in large aperture-filling near-diffraction-limited modes. (2) Compound laser rods with flanged-nonabsorbing-endcaps fabricated by diffusion bonding. (3) Techniques for suppressing amplified spontaneous emission (ASE) and parasitics in the polished barrel rods.

Paper Details

Date Published: 3 April 2000
PDF: 15 pages
Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); doi: 10.1117/12.380891
Show Author Affiliations
Raymond J. Beach, Lawrence Livermore National Lab. (United States)
Eric C. Honea, Lawrence Livermore National Lab. (United States)
Steven B. Sutton, Lawrence Livermore National Lab. (United States)
Camille M. Bibeau, Lawrence Livermore National Lab. (United States)
Jay A. Skidmore, Lawrence Livermore National Lab. (United States)
Mark A. Emanuel, Lawrence Livermore National Lab. (United States)
Stephen A. Payne, Lawrence Livermore National Lab. (United States)
Petras V. Avizonis, Boeing Co. (United States)
R. S. Monroe, Boeing Co. (United States)
Dennis G. Harris, Boeing Co. (United States)

Published in SPIE Proceedings Vol. 3889:
Advanced High-Power Lasers
Marek Osinski; Howard T. Powell; Koichi Toyoda, Editor(s)

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