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首页> 外文会议>Fiber lasers XI: technology, systems, and applications >Polarization maintaining, high power and high efficiency (6+1) ×1 pump/signal combiner
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Polarization maintaining, high power and high efficiency (6+1) ×1 pump/signal combiner

机译：保偏，高功率和高效率（6 + 1）×1泵浦/信号组合器

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摘要

We have developed an all-glass, fusion spliceable polarization maintaining (6+1) × 1 pump/signal combiner for fiber lasers and amplifiers. We utilize an enhanced tapered fiber bundle technology for multimode pump channels and a vanishing core fiber for the single mode polarization maintaining large mode area (PLMA) signal channel. The signal channel of the combiner is optimized to match a double-clad PLMA fiber with 20 micron core and 400 micron glass cladding with 0.065 numerical aperture (NA). The multimode pump channels have 200 micron core and 240 micron cladding with NA of 0.22 designed to deliver high power 980 nm pump light. The same double-clad PLMA fiber is used as both the signal input channel and the combined output for the device. Polarization axes of the input and output PLMA fibers are aligned during the fusion splices to achieve polarization crosstalk below -20 dB. Utilizing this approach, we have achieved coupling loss of ～0.4 dB for the signal channel as measured from the input PLMA to the output PLMA at a wavelength of 1060 nm and coupling loss below 0.01 dB for all pump channels as determined from the measured temperature rise of the combiner package temperature as the optical pump power at 974 nm is increased up to 45 W. Low signal and pump losses result in high efficiency lasing or amplification at over a kW of pump power for high power applications where a single mode, high polarization extinction ratio output is required.
机译：我们已经开发了用于光纤激光器和放大器的全玻璃，可熔接拼接偏振保持（6 + 1）×1泵浦/信号组合器。我们将增强型锥形光纤束技术用于多模泵浦通道，将消失的纤芯光纤用于单模偏振保持大模面积（PLMA）信号通道。优化了组合器的信号通道，以匹配20微米纤芯的双包层PLMA光纤和0.065数值孔径（NA）的400微米玻璃包层。多模泵浦通道具有200微米的纤芯和240微米的包层，其NA为0.22，旨在提供高功率980 nm泵浦光。相同的双包层PLMA光纤用作设备的信号输入通道和组合输出。在熔接过程中，输入和输出PLMA光纤的偏振轴会对齐，以使偏振串扰低于-20 dB。利用这种方法，我们实现了在1060 nm波长处从输入PLMA到输出PLMA所测量的信号通道的耦合损耗为〜0.4 dB，并且根据所测得的温升确定的所有泵浦通道的耦合损耗均低于0.01 dB 974 nm处的光泵浦功率增加到45 W时，组合器封装温度的变化。信号和泵浦损耗低，可在超过kW的泵浦功率下产生高效率的激光发射或放大，适用于单模，高偏振的高功率应用需要消光比输出。

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