Optical: systems and elements – Optical amplifier
Reexamination Certificate
2005-06-01
2009-08-18
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
C359S341100, C372S006000
Reexamination Certificate
active
07576909
ABSTRACT:
The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect spatial beam-quality can be ensured by exciting the fundamental mode in the multi-mode fibers with appropriate mode-matching optics and techniques. The loss of spatial beam-quality in the multi-mode fibers along the fiber length can be minimized by using multi-mode fibers with large cladding diameters. Near diffraction-limited coherent multi-mode amplifiers can be conveniently cladding pumped, allowing for the generation of high average power. Moreover, the polarization state in the multi-mode fiber amplifiers can be preserved by implementing multi-mode fibers with stress producing regions or elliptical fiber cores. These lasers find application as a general replacement of Nd: based lasers, especially Nd:YAG lasers. Particularly utility is disclosed for applications in the marking, micro-machining and drilling areas.
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Fermann Martin E.
Harter Donald J.
Hellner Mark
IMRA America, Inc.
Sughrue & Mion, PLLC
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