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Fiber phase conjugators at 1064-nm, 532-nm, and 355-nm wavelengths

机译:光纤相位共轭器在1064 nm,532 nm和355 nm波长处

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Undoped multimode quartz fibers can be used as effective phase conjugators with high fidelity and reflectivity for improving the beam quality of lasers with high average power. Such phase conjugators based on stimulated Brillouin scattering (SBS) in undoped multimode quartz fibers with a core diameter of 100 mu m and a length of more than 2 m were characterized at wavelengths of 1064, 532, and 355 nm. The power thresholds at these three wavelengths are 6.4, 3.3, and 3 kW, respectively, and the maximum SBS reflectivity is more than 50% in all cases, without a significant depolarization owing to the fiber. Direct measurement of the far-field fidelity, i.e., the phase-conjugated part of the reflected light in the far field at 1064 nm, results in a fidelity of more than 90%. (C) 1997 Optical Society of America.
机译:未掺杂的多模石英纤维可以用作具有高保真度和反射率的有效相位共轭器,以改善具有高平均功率的激光器的光束质量。这种基于共轭布里渊散射(SBS)的相位共轭器,在波长为1064、532和355 nm处具有纤芯直径为100μm且长度大于2 m的未掺杂多模石英纤维中。这三个波长的功率阈值分别为6.4、3.3和3 kW,并且在所有情况下,最大SBS反射率均超过50%,而不会由于光纤而导致明显的去极化。直接测量远场保真度,即在1064 nm处的远场反射光的相位共轭部分,可以得到90%以上的保真度。 (C)1997年美国眼镜学会。

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