
Proceedings Paper
External and common-cavity high spectral density beam combining of high power fiber lasersFormat | Member Price | Non-Member Price |
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Paper Abstract
Spectral beam combining (SBC) has been extensively used for power scaling of laser systems. SBC is an incoherent
technique of combining laser radiation from multiple sources with offset wavelengths into a single near-diffractionlimited
beam with increased energy brightness. SBC by means of volume Bragg gratings (VBGs) recorded in photo-thermo-
refractive (PTR) glass has been shown to be a simple and robust technique for combining high-power laser
radiation. High-efficiency large-aperture VBGs were fabricated in PTR glass wafers. While being photosensitive in the
UV, PTR glass offers high transmittance in the near-IR and visible parts of spectrum. Excellent mechanical properties
and refractive index independent of temperature enable VBGs in PTR glass to withstand high-power laser radiation,
making them ideal elements for high-power SBC. We report spectral combination of five randomly polarized fiber
lasers with 0.5 nm spectral separation between channels around 1064 nm using reflecting VBGs in PTR glass.
Maximum output power of the system is 773 W, corresponding to 91.7% combining efficiency. It is shown that VBGs
introduce no significant beam distortions under high-power operation. Additionally, a common-cavity configuration for
SBC with automatic wavelength control of sources by intra-cavity VBGs is suggested. Two fiber lasers are combined
using this technique and automatic wavelength control is demonstrated. We show how simple power scaling allows
obtaining multi-kW near-diffraction-limited laser radiation via SBC with volume Bragg gratings in PTR glass.
Paper Details
Date Published: 17 March 2008
PDF: 8 pages
Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 687314 (17 March 2008); doi: 10.1117/12.769586
Published in SPIE Proceedings Vol. 6873:
Fiber Lasers V: Technology, Systems, and Applications
Jes Broeng; Clifford Headley, Editor(s)
PDF: 8 pages
Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 687314 (17 March 2008); doi: 10.1117/12.769586
Show Author Affiliations
Oleksiy Andrusyak, The College of Optics and Photonics, Univ. of Central Florida (United States)
Igor Ciapurin, OptiGrate (United States)
Vadim Smirnov, OptiGrate (United States)
Igor Ciapurin, OptiGrate (United States)
Vadim Smirnov, OptiGrate (United States)
George Venus, The College of Optics and Photonics, Univ. of Central Florida (United States)
Nikolai Vorobiev, The College of Optics and Photonics, Univ. of Central Florida (United States)
Leonid Glebov, The College of Optics and Photonics, Univ. of Central Florida (United States)
Nikolai Vorobiev, The College of Optics and Photonics, Univ. of Central Florida (United States)
Leonid Glebov, The College of Optics and Photonics, Univ. of Central Florida (United States)
Published in SPIE Proceedings Vol. 6873:
Fiber Lasers V: Technology, Systems, and Applications
Jes Broeng; Clifford Headley, Editor(s)
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