Axicons for mode conversion in high peak power, higher-order mode, fiber amplifiers
نویسندگان
چکیده
منابع مشابه
Mode competition in high power fiber amplifiers.
Using a beam propagation model of Yb3+ doped, CW fiber amplifiers we show that gain saturation by a strong fundamental mode significantly suppresses the growth of higher order modes with parallel polarization, but enhances the growth of higher order modes with perpendicular polarization. We quantify this effect in straight and bent fibers, with full core or restricted area doping.
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For powers exceeding a sharp threshold in the vicinity of several hundred watts the beam quality from some narrow bandwidth fiber amplifiers is severely degraded. We show that this can be caused by transverse thermal gradients induced by the amplification process.
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We numerically model the performance of highpower 977-nm fiber lasers and amplifiers pumped at 915 nm, in which the Yb is doped in a ring inside the core of a high-ordermode (HOM) fiber. Light in the spatially coherent LP07 mode is amplified in the fiber, and then coupled to the LP01 mode by longperiod gratings. For the laser, it is found that parasitic oscillation on the 1023-nm four-level tra...
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We present a simple theoretical model of transverse mode instability in high-power rare-earth doped fiber amplifiers. The model shows that efficient power transfer between the fundamental and higher-order modes of the fiber can be induced by a nonlinear interaction mediated through the thermo-optic effect, leading to transverse mode instability. The temporal and spectral characteristics of the ...
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1 Abstract We have tested a series of Ytterbium doped large core fibers operating near 10Kpps and producing pulses of approximately 1ns. We have achieved 850μJ/pulse resulting in peak powers in excess of 2MW with 0.4ns pulses and near diffraction limited beams. In another fiber, we have achieved over 1.5mJ/pulse with pulses of 900ps corresponding to 1.65MW of peak power and M of 2.5. In the lat...
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ژورنال
عنوان ژورنال: Optics Express
سال: 2015
ISSN: 1094-4087
DOI: 10.1364/oe.23.033849