Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power

University of Southampton, Southampton, England, United Kingdom
Optics Express (Impact Factor: 3.49). 01/2005; 12(25):6088-92. DOI: 10.1364/OPEX.12.006088
Source: PubMed


We have demonstrated a highly-efficient cladding-pumped ytterbium-doped fiber laser generating 1.36 kW of continuous-wave output power at 1.1 mum with 83% slope efficiency and near diffraction-limited beam quality. The laser was end-pumped through both fiber ends and showed no evidence of roll-over even at the highest output power, which was limited only by available pump power.

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    • "But designing a high energy/high power fiber laser is difficult enough due to generation of nonlinear effects which hinder reliable system operation. High pump absorption, which can be achieved with either a larger core diameter or by increasing the Yb concentration, is desirable as it allows shorter fiber lengths to limit nonlinear effects [2]. For getting single mode operation with large core diameter, numerical aperture (NA) of the fiber should be low which compromises co–dopants concentration in the core. "
    Maitreyee Saha · Sourav Das Chowdhury · Debasis Pal · Atasi Pal · Mrinmay Pal · Ranjan Sen ·

    Workshop on Specialty Optical Fibers and Their Applications (WSOF 2015), Hong Kong; 11/2015
    • "Slope efficiency of 83% in transmission of the laser power was achieved. Loss of efficiency in fibre delivery of laser energy has been attributed to optical deterioration of fibre material due to thermal effects and non-linear scattering [8]. As the technology continues to improve through research, there is expectation of reduced loss of energy in fibre delivery and with increase in efficiency. "
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    14th International Biennial Conference of the Botswana Institution of Engineers, Phakalane Golf Resort, Gaborone; 10/2015
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    • "Rare–earth (RE) doped optical fiber, an active medium to provide gain in fiber laser, plays an important role in differentiating the laser performance, the power scaling capabilities, stability and cost. Among the range of RE dopants used in fiber lasers, so far, Ytterbium (Yb) has shown excellent power scaling with output power exceeding multikilowatt level because of the broadband absorption spectrum of Yb +3 which enables multi-pump or multi-wavelength pumping schemes facilitating power scaling through low cost unstable pumps [3], [4]. Additionally, the simple two-level system of Yb +3 provides efficient lasing around 1 μm eliminating Manuscript received January 7, 2015; revised April 13, 2015; accepted May 31, 2015. "
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    ABSTRACT: The paper demonstrates a standardized process of vapor phase doping to fabricate large core Yb–doped preforms with longer useful length in reproducible manner. The optimization of the process led to successful achievement of Yb-doped core thickness of 4.5 mm (in 14.8 mm of preform diameter) by depositing up to 30 number of core layers with controlled amount of generated precursor vapors. The influence of the process parameters was studied rigorously to enhance the useful preform length up to 380 mm. A combination of Yb and Al in different proportions was doped into the core with uniform dopant concentration along the length by adjusting few process parameters efficiently. The Al2O3 concentration up to the level of 17.8 mol% has been achieved successfully which resulted in NA of 0.31. This is the highest ever doping of Al in passive fibers by any modified chemical vapor deposition process. The Yb2O3 content in the active fibers is as high as 0.47 mol%.
    Journal of Lightwave Technology 06/2015; 33(17):3533-3541. DOI:10.1109/JLT.2015.2442226 · 2.97 Impact Factor
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