Pfeiffer Tom, Petermann Markus, Draxinger Wolfgang, Jirauschek Christian, Huber Robert
Institut für Biomedizinische Optik, Universität zu Lübeck, Peter-Monnik-Weg 4, 23562 Lübeck, Germany.
Medizinisches Laserzentrum Lübeck GmbH, Peter-Monnik-Weg 4, 23562 Lübeck, Germany.
Biomed Opt Express. 2018 Aug 7;9(9):4130-4148. doi: 10.1364/BOE.9.004130. eCollection 2018 Sep 1.
We investigate the origin of high frequency noise in Fourier domain mode locked (FDML) lasers and present an extremely well dispersion compensated setup which virtually eliminates intensity noise and dramatically improves coherence properties. We show optical coherence tomography (OCT) imaging at 3.2 MHz A-scan rate and demonstrate the positive impact of the described improvements on the image quality. Especially in highly scattering samples, at specular reflections and for strong signals at large depth, the noise in optical coherence tomography images is significantly reduced. We also describe a simple model that suggests a passive physical stabilizing mechanism that leads to an automatic compensation of remaining cavity dispersion in FDML lasers.
我们研究了傅里叶域锁模（FDML）激光器中高频噪声的起源，并提出了一种色散补偿极佳的装置，该装置几乎消除了强度噪声，并显著改善了相干特性。我们展示了3.2兆赫兹A扫描速率下的光学相干断层扫描（OCT）成像，并证明了所述改进对图像质量的积极影响。特别是在高散射样本中、镜面反射处以及大深度处的强信号情况下，光学相干断层扫描图像中的噪声显著降低。我们还描述了一个简单模型，该模型提出了一种被动物理稳定机制，可自动补偿FDML激光器中剩余的腔色散。
