Ultra low noise Fourier domain mode locked laser for high quality megahertz optical coherence tomography
Ultra low noise Fourier domain mode locked laser for high quality megahertz optical coherence tomography
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DOI：
10.1364/boe.9.004130
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发表时间：
2018-08
影响因子：
3.4
通讯作者：
T. Pfeiffer;Markus Petermann;W. Draxinger;C. Jirauschek;R. Huber
中科院分区：
文献类型：
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作者：
T. Pfeiffer;Markus Petermann;W. Draxinger;C. Jirauschek;R. Huber
本文研究了傅里叶域锁模激光器中高频噪声的来源，并提出了一种色散补偿的方法，该方法消除了强度噪声，大大提高了相干特性。我们显示了光学相干断层扫描（OCT）成像在3.2 MHz的A-扫描速率，并证明了所描述的改善对图像质量的积极影响。特别是在高散射样品中，在镜面反射和大深度处的强信号下，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的模型，提出了一个被动的物理稳定机制，导致剩余的腔色散FDML激光器的自动补偿。
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.