Wavelength stabilization of a synchronously pumped optical parametric oscillator: optimizing proportional-integral control.
Wavelength stabilization of a synchronously pumped optical parametric oscillator: optimizing proportional-integral control.
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DOI：
10.1063/1.3385684
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发表时间：
2010-05
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影响因子：
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通讯作者：
T. Lamour;Jinghua Sun;D. Reid
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文献类型：
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作者：
T. Lamour;Jinghua Sun;D. Reid
本文描述了一种利用比例积分反馈控制实现同步泵浦超快光参量振荡器波长稳定的形式化方法。利用位置敏感探测器作为传感器，利用压电换能器改变振荡器的腔长，实现了闭环波长稳定。通过表征回路组件的频率响应，我们构建了控制器的预测模型，该模型正式表明，仅比例反馈不足以消除稳态误差，与实验观察结果一致。通过对控制器模型的数值优化，获得了最优的比例增益系数和积分增益系数，使沉降时间最小化，同时将超调量限制在可接受的范围内。结果表明，有效波长和功率稳定水平仅受泵浦激光器的相对强度噪声的限制。
We describe a formal approach to the wavelength stabilization of a synchronously pumped ultrafast optical parametric oscillator using proportional-integral feedback control. Closed-loop wavelength stabilization was implemented by using a position-sensitive detector as a sensor and a piezoelectric transducer to modify the cavity length of the oscillator. By characterizing the frequency response of the loop components, we constructed a predictive model of the controller which showed formally that a proportional-only feedback was insufficient to eliminate the steady state error, consistent with experimental observations. The optimal proportional and integral gain coefficients were obtained from a numerical optimization of the controller model that minimized the settling time while also limiting the overshoot to an acceptable value. Results are presented showing effective wavelength and power stabilization to levels limited only by the relative intensity noise of the pump laser.