Irimatsugawa Tomoya, Shimizu Yukiko, Okubo Sho, Inaba Hajime
Opt Express. 2021 Oct 25;29(22):35613-35622. doi: 10.1364/OE.435679.
We introduce and experimentally apply "cosine similarity" as an index for quantitatively evaluating the degree of change in the spectra of optical frequency combs. The cosine similarity with the original spectrum increased or decreased as the amount of control applied to the combs increased or decreased; this is considered to be an appropriate indication of spectral similarity. Therefore, we apply this approach to an evaluation of the temporal spectral changes in polarization-maintaining (PM) and non-PM combs. The results suggest that there is no significant difference between the spectral stabilities of PM and non-PM combs, and reveal that the spectral sensitivity to the amount of control is a more effective factor.
我们引入并通过实验应用“余弦相似度”作为定量评估光频梳光谱变化程度的指标。随着施加到光频梳上的控制量增加或减少，与原始光谱的余弦相似度也相应增加或降低；这被认为是光谱相似性的合适指标。因此，我们将此方法应用于评估保偏（PM）和非保偏光频梳的时间光谱变化。结果表明，保偏和非保偏光频梳的光谱稳定性之间没有显著差异，并揭示了光谱对控制量的敏感度是一个更有效的因素。
