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18 Results
Enhanced pulseshaping capabilities and reduction of non-linear effects in all-fiber MOPA pulsed system
19 February 2009
Pulseshaping is important in high energy pulsed fiber MOPA system to mitigate non-linear effects and optimize the processing of different materials. However, pulseshaping is greatly limited by the spectral features of the semiconductor seed source commonly used as the master oscillator. Through the appropriate design of an external fiber...
Simple design for singlemode high power CW fiber laser using multimode high NA fiber
12 February 2009
A large number of high power CW fiber lasers described in the literature use large mode area (LMA) double cladding fibers. These fibers have large core and low core numerical aperture (NA) to limit the number of supported modes and are typically operated under coiling to eliminate higher order...
10 W ASE-free single mode high power double cladding Er
3+
-Yb
3+
amplifier
23 February 2007
We designed a high output power double cladding erbium-ytterbium fibre amplifier that showed no amplified spontaneous emission (ASE) at 1.0 µm using a quasi singlemode fibre. The reduction of the amplified stimulated emission (ASE) at 1.0 µm was found to be the combination of fibre design and temperature effect...
Low photodarkening single cladding ytterbium fibre amplifier
20 February 2007
A single cladding ytterbium doped fibre amplifier pumped at 980 nm that exhibits negligible amount of photodarkening over a long period of time is demonstrated. The output power as a function of time decreased by a very small factor compared to standard single mode ytterbium fibres. To achieve this...
Experimental validation of highly doped erbium-doped fiber for the design of a +20dBm, single pump and compact, WDM L-band EDFA
28 October 2006
Highly doped EDFs with 13.4 to 34.7-dB/m absorption coefficients were inserted in a two-stage EDFA to enable a MSA-compliant packaging. Experimental validations led to the design of a low noise 20-dBm single-pumped WDM Lband EDFA.
Accurate modeling and experimental validation of a singlemode 4 W output power double cladding erbium ytterbium fibre amplifier
8 September 2006
We developed a model that accurately predicts the performances of high power double cladding erbium ytterbium fibre amplifiers. We experimentally validate the model in co- and counter-propagation configuration for different pump wavelengths and fibre lengths. By adjusting the ytterbium to erbium cross-relaxation rate with a simple amplifier experiment, we...
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