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首页> 外文会议>Annual solid state and diode laser technology review;SSDLTR 2009; 20090629-0702;20090629-0702; Newton, MA(US);Newton, MA(US) >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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摘要

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：新型掺（（Yb）的光子晶体光纤（PCF）使基于光纤的chi脉冲放大系统能够产生毫焦级的脉冲，可压缩到飞秒脉冲宽度[1,2]。刚性双包层光纤棒在市场上可以买到，有效面积大（> 2300μm〜2），泵浦吸收率高（在976 nm时约为30 dB / m），可在不到一米的光纤中进行有效放大。有效面积大和放大器长度短的组合限制了对高阶模（HOM）的抑制，但是，这种光纤除了基本功以外还可以支持几种模。刚性杆结构减少了光纤中弱导基本模式与其他模式之间的耦合，但是HOM可能仍会在信号注入时被激发，这通常是通过将自由空间耦合到纤芯中来完成的。与基模同极化的HOM相对较少，因为它们相干干涉，会显着降低光束和指向稳定性[3]。

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