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首页> 外文会议>Fiber lasers XI: technology, systems, and applications >High peak- and average-power, pulse shaped fiber laser in the ns-regime applying step-index XLMA gain fibers
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High peak- and average-power, pulse shaped fiber laser in the ns-regime applying step-index XLMA gain fibers

机译：ns级的高峰值功率和平均功率脉冲形光纤激光器，采用阶跃折射率XLMA增益光纤

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摘要

Pulsed fiber lasers and continuous-wave (cw) fiber lasers have become the tool of choice in more and more laser based industrial applications like metal cutting and welding mainly because of their robustness, compactness, high brightness, high efficiency and reasonable costs. However, to further increase the productivity with those laser types there is a great demand for even higher laser power specifications. In this context we demonstrate a pulsed high peak- and average-power fiber laser in a Master Oscillator Power Amplifier (MOPA) configuration with selectable pulse durations between 1 ns and several hundred nanoseconds. To overcome fiber nonlinearities such as stimulated Raman scattering (SRS) and self-phase-modulation (SPM) flexible Ytterbium doped extra-large mode area (XLMA) step index fibers, prepared by novel powder-sinter technology, have been used as gain fibers. As an example, for 12 ns pulses with a repetition rate of 10 kHz, a pump power limited average laser output power of more than 400 W in combination with peak powers of more than 3.5 MW (close to self-focusing-threshold) has been achieved in stable operation. The potentials of this laser system have been further explored towards longer pulse durations in order to achieve even higher pulse energies by means of pulse shaping techniques. In addition, investigations have been conducted with reduced pulse energies and repetition rates up to 500 kHz and average powers of more than 500 W at nearly diffraction limited beam quality.
机译：脉冲光纤激光器和连续波（cw）光纤激光器已成为越来越多基于激光的工业应用（例如金属切割和焊接）中的首选工具，这主要是因为它们的坚固性，紧凑性，高亮度，高效率和合理的成本。但是，为了进一步提高这些激光器类型的生产率，强烈要求更高的激光器功率规格。在这种情况下，我们展示了主振荡器功率放大器（MOPA）配置中的脉冲高峰值功率和平均功率光纤激光器，其可选脉冲持续时间在1 ns至几百纳秒之间。为了克服光纤非线性，例如受激拉曼散射（SRS）和自相位调制（SPM），采用新型粉末烧结技术制备的掺Y柔性超大模面积（XLMA）阶跃折射率光纤作为增益光纤。 。例如，对于12 ns重复频率为10 kHz的脉冲，泵浦功率限制的平均激光输出功率大于400 W，峰值功率大于3.5 MW（接近自聚焦阈值）实现稳定运行。为了通过脉冲整形技术获得甚至更高的脉冲能量，还朝着更长的脉冲持续时间进一步探索了该激光系统的潜力。另外，已经进行了研究，以降低的脉冲能量和高达500 kHz的重复频率以及在近乎衍射极限的光束质量下平均功率超过500 W的情况进行研究。

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