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首页> 外文会议>Annual solid state and diode laser technology review >Modal Measurement of a Large-Area Photonic Crystal Fiber Amplifier Using Spatially Resolved Spectral Interferometry
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Modal Measurement of a Large-Area Photonic Crystal Fiber Amplifier Using Spatially Resolved Spectral Interferometry

机译：使用空间分辨光谱干涉法的大面积光子晶体光纤放大器的模态测量

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New ytterbium (Yb)-doped photonic crystal fibers (PCFs) have enabled fiber-based chirped-pulse-amplification systems to produce millijoule-level pulses, compressible to femtosecond pulse widths [1,2]. Rigid double-clad fiber rods are commercially available with large effective areas (>2300 μm~2) and high pump absorption (～30 dB/m at 976 nm) for efficient amplification in less than a meter of fiber. The combination of large effective areas and short amplifier lengths limits the suppression of higher-order modes (HOMs), however, and such fibers may support several modes in addition to the fundamental. The rigid rod construction reduces coupling between the weakly guided fundamental and other modes within the fiber, but HOM may still be excited at the signal injection, which is typically done using free-space coupling into the core. Relatively small amounts of HOM that are co-polarized with the fundamental mode can significantly degrade the beam and pointing stability because they interfere coherently [3].
机译：新的YTTerbium（YB） - 掺杂的光子晶体纤维（PCFS）使基于光纤的啁啾脉冲放大系统能够产生毫焦级脉冲，可压缩到飞秒脉冲宽度[1,2]。刚性双层纤维棒可商购获得大有效区域（>2300μm〜2），高泵吸收（〜976nm，30dB / m），可在小于一米的纤维中有效扩增。大有效区域和短放大器长度的组合限制了更高阶模式（HOMS）的抑制，并且除了基本的基础之外，这种光纤可以支持多种模式。刚性杆结构减少了纤维内弱引导的基本和其他模式之间的耦合，但是霍姆可能仍然在信号注入时兴奋，这通常是使用自由空间耦合到芯中完成的。具有基本模式的相同偏极的相对少量的霍可能会显着降低光束和指向稳定性，因为它们连贯干扰[3]。

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