A study on fundamentals and applications of a fuzzy mode laser

本课题对模糊模式激光器的振荡机理及其应用进行了深入的研究。在振荡机理方面，我们首次阐明了模糊模式激光器的输出是由啁啾频率梳组成的。啁啾频率梳具有独特的特性，如(a)超快的啁啾速率（bb0 200 PHz/s）， (b)高频啁啾线性度，(c)高度相位相关的梳组件。对模糊模激光器进行了理论分析，较好地解释了模糊模激光器的振荡机理。模糊模式激光器的一个潜在应用是光频域反射仪（OFDR）。本课题为利用模糊模激光实现远距离、高精度OFDR奠定了基础。在实验中，在4km的距离上获得了50 μ m的空间精度。总之，本研究阐明了模糊模激光器的振荡机理，并成功地演示了OFDR的应用。

In this research project, oscillation mechanisms and applications a fuzzy mode laser was extensively investigated.As to the oscillation mechanisms, we clarified for the first time that an output of the fuzzy mode laser consists of a chirped frequency comb. The chirped frequency comb has unique properties such as (a) ultra fast chirp rate (>200 PHz/s), (b) high frequency chirp linearity, and (c) highly phasecorrelated comb components. A theoretical analysis of the fuzzy mode laser was also carried out and it could explain well the oscillation mechanisms of the fuzzy mode laser.A potential application of the fuzzy mode laser is an optical frequency domain reflectometry (OFDR). In this reseach project, we establishied a basis needed to realize the long distance, high accuracy OFDR by the fuzzy mode laser. In the experiment, a spatial accuracy of 50 mum was obtained at the distance of 4km.In conclusion, this research clarified the oscillation mechanisms of the fuzzy mode laser, and an application of OFDR was successfully demonstrated.