Radially and azimuthally polarized nanosecond Yb-doped fiber MOPA system incorporating temporal shaping.
Radially and azimuthally polarized nanosecond Yb-doped fiber MOPA system incorporating temporal shaping.
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DOI：
10.1364/ol.42.001740
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发表时间：
2017-05
期刊：
影响因子：
3.6
通讯作者：
D. Lin;N. Baktash;M. Berendt;M. Beresna;P. Kazansky;W. Clarkson;S. Alam;D. Richardson
中科院分区：
文献类型：
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作者：
D. Lin;N. Baktash;M. Berendt;M. Beresna;P. Kazansky;W. Clarkson;S. Alam;D. Richardson
我们报道了一种掺Yb光纤主振荡器功率放大器（MOPA）系统，该系统具有选择性地产生具有用户定义的时间脉冲形状的环形径向和方位偏振光束的能力。所需的输出偏振的纳米光栅的空间变化的半波片（S-波片）的帮助下产生的。后者用于将来自前置放大级的线性偏振基模（LP 01）输出转换为在功率放大级之前的环形径向偏振光束。在25 kHz、脉冲宽度为100 ns、脉冲形状为用户自定义的径向和方位偏振态下，获得了最大脉冲能量为860 μJ的激光输出。偏振纯度和光束传播因子（M2）分别测量为>12 dB和2.2。
We report an Yb-doped fiber master-oscillator power-amplifier (MOPA) system with the capability of selectively generating doughnut-shaped radially and azimuthally polarized beams with user-defined temporal pulse shapes. The desired output polarization was generated with the aid of a nanograting spatially variant half-waveplate (S-waveplate). The latter was used to convert the linearly polarized fundamental (LP01) mode output from the preamplification stages to a doughnut-shaped radially polarized beam prior to the power amplifier stage. A maximum output pulse energy of ∼860 μJ was achieved for ∼100 ns pulses at 25 kHz with user-defined pulse shape for both radial and azimuthal polarization states. The polarization purity and beam propagation factor (M2) were measured to be >12 dB and 2.2, respectively.