论文标题
相位不匹配对CW泵的级联二次非线性频率梳的影响的实验研究
Experimental study of the effect of phase mismatch on a CW-pumped cascaded quadratic nonlinear frequency comb
论文作者
论文摘要
通过连续波动的级联二次非线性（CQN）产生光学频率梳子，似乎是建立良好模型激光器的有希望的替代方法，尤其是在需要进入中红外光谱区域的情况下。我们报告了基于第二谐波生成（SHG）的CQN频率梳光谱特性的实验研究，并由连续波光学参数振荡器内部泵送。我们的研究重点是SHG相不匹配，这在先前报道的CQN频率梳研究中几乎没有引起人们的注意。我们研究的主要观察结果是，可以通过调整相位不匹配来提高CQN频率梳的光谱纯度。除了在近红外区域生成频率梳的CQN过程外，我们的实验设置还涉及其他几个非线性过程。这些过程导致复合梳子，该复合梳子从可见的到中红外延伸。
Optical frequency comb generation by continuous-wave-pumped cascaded quadratic nonlinearities (CQN) appears a promising alternative to well-established modelocked lasers, especially if access to the mid-infrared spectral region is needed. We report an experimental investigation of spectral properties of a CQN frequency comb, which is based on second-harmonic generation (SHG) and is pumped internally by a continuous-wave optical parametric oscillator. Our study focuses on SHG phase mismatch, which has drawn little attention in the previously reported CQN frequency comb research. The main observation of our study is that it is possible to improve spectral purity of the CQN frequency comb by adjusting the phase mismatch. In addition to the CQN process that generates a frequency comb in the near-infrared region, our experimental setup involves several other nonlinear processes. These processes lead to a composite comb, which extends from visible to mid-infrared.
