• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Laser technology for defense and security IX >High power modal instability measurements of very large mode area (VLMA) step index fibers
【24h】

High power modal instability measurements of very large mode area (VLMA) step index fibers

机译：超大模面积（VLMA）阶跃折射率光纤的高功率模态不稳定性测量

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High power (＞0.5kW) experiments using low NA (～0.07), very large mode area (VLMA) step index fibers (SI) (with core/clad diameters: 45/375, 60/500um) and gain tailored step index (GT-SI) fibers (with doped-core/core/clad diameters: 38/60/400, 50/80/533um) are presented. In fiber amplifier experiments with multi-moded beam (M~21.5-3) outputs, Stimulated Thermal Rayleigh scattering (STRS) threshold is determined by comparing gain dependence of output mode quality between high power (＞200W) and low power (＜100W) experiments for a given fiber layout. Beam quality degradation with signal power is characterized well above the instability threshold where a saturation of the phenomena is observed. For SI fibers degree of beam quality degradation is found to be significantly worse for tighter fiber coil diameters. GT-SI fibers exhibit significantly less modal degradation compared to SI fibers. STRS instability threshold is further verified with signal power dependent multi-path interference spectrum (MPI) measurements which exhibited exponential broadening above the threshold. Strength of STRS nonlinear coupling coefficients are estimated from experimental data using a comprehensive 3-dimensional transverse spatial hole burning (TSHB) fiber MOPA numerical model, phenomenologicaly extended to include STRS.
机译：使用低NA（〜0.07），超大模面积（VLMA）阶跃折射率光纤（SI）（纤芯/包层直径：45 / 375、60 / 500um）并获得定制的阶跃折射率（> 0.5kW）的大功率实验GT-SI）纤维（掺杂纤芯/纤芯/包层直径：38/60/400，50/80 / 533um）。在具有多模光束（M〜21.5-3）输出的光纤放大器实验中，通过比较高功率（＞ 200W）和低功率（＜100W）之间输出模式质量的增益依赖性来确定受激热瑞利散射（STRS）阈值给定光纤布局的实验。信号质量导致的光束质量下降的特征远高于观察到现象饱和的不稳定性阈值。对于SI纤维，发现束直径的降低对于更紧密的纤维线圈直径而言显着更差。与SI纤维相比，GT-SI纤维表现出明显更低的模态降解。 STRS不稳定性阈值进一步通过信号功率相关的多径干扰频谱（MPI）测量进行了验证，该测量显示出超过阈值的指数展宽。使用全面的3维横向空间孔燃烧（TSHB）纤维MOPA数值模型从实验数据中估算出STRS非线性耦合系数的强度，其现象学扩展到包括STRS。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号