Huber R, Wojtkowski M, Taira K, Fujimoto J, Hsu K
Opt Express. 2005 May 2;13(9):3513-28. doi: 10.1364/opex.13.003513.
We demonstrate a high-speed, frequency swept, 1300 nm laser source for frequency domain reflectometry and OCT with Fourier domain/swept-source detection. The laser uses a fiber coupled, semiconductor amplifier and a tunable fiber Fabry-Perot filter. We present scaling principles which predict the maximum frequency sweep speed and trade offs in output power, noise and instantaneous linewidth performance. The use of an amplification stage for increasing output power and for spectral shaping is discussed in detail. The laser generates ~45 mW instantaneous peak power at 20 kHz sweep rates with a tuning range of ~120 nm full width. In frequency domain reflectometry and OCT applications the frequency swept laser achieves 108 dB sensitivity and ~10 mum axial resolution in tissue. We also present a fast algorithm for real time calibration of the fringe signal to equally spaced sampling in frequency for high speed OCT image preview.
我们展示了一种用于频域反射测量和傅里叶域/扫频源检测的光学相干断层扫描（OCT）的高速、频率扫描1300纳米激光源。该激光器采用光纤耦合半导体放大器和可调谐光纤法布里 - 珀罗滤波器。我们提出了缩放原理，可预测最大频率扫描速度以及输出功率、噪声和瞬时线宽性能之间的权衡。详细讨论了使用放大级来增加输出功率和进行光谱整形的问题。该激光器在20千赫兹扫描速率下产生约45毫瓦的瞬时峰值功率，调谐范围约为120纳米全宽。在频域反射测量和OCT应用中，频率扫描激光器在组织中实现了108分贝的灵敏度和约10微米的轴向分辨率。我们还提出了一种快速算法，用于对条纹信号进行实时校准，以实现高速OCT图像预览在频率上的等间距采样。
