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Frequency comb swept lasers for optical coherence tomography

机译:频率梳扫描光学相干断层扫描

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摘要

We demonstrate a frequency comb (FC) swept laser and a frequency comb Fourier domain mode locked (FC-FDML) laser for applications in optical coherence tomography (OCT). The fiber-based FC swept lasers operate at a sweep rate of 1kHz and 120kHz, respectively over a 135nm tuning range centered at 1310nm with average output powers of 50mW. A 25GHz free spectral range frequency comb filter in the cavity of swept lasers causes the lasers to generate a series of well defined frequency steps. The narrow bandwidth (0.015nm) of the frequency comb filter enables a ~-1.2dB sensitivity roll off over ~3mm range, compared to conventional swept source and FDML lasers which have -10dB and - 5dB roll offs, respectively. Measurements at very long ranges are possible with minimal sensitivity loss, however reflections from outside the principal measurement range of 0-3mm appear aliased back into the principal range. In addition, the frequency comb output from the lasers are equally spaced in frequency (linear in k-space). The filtered laser output can be used to self-clock the OCT interference signal sampling, enabling direct fast Fourier transformation of the fringe signals, without the need for fringe recalibration procedures. The design and operation principles of FC swept lasers are discussed and interferometric measurement applications are proposed.
机译:我们展示了一种频率梳(FC)扫描激光器和频率梳傅里叶域模式锁定(FC-FDML)激光器,用于光学相干断层扫描(OCT)。基于纤维的Fc扫描激光器以1kHz和120kHz的扫描速率运行,分别在135nm调谐范围内以1310nm为中心,平均输出功率为50mW。扫掠激光器腔中的25GHz自由谱频率梳滤波器导致激光器产生一系列良好的定义频率步骤。与具有-10dB和-5dB滚动的FDML激光器相比,频率梳状滤波器的窄带宽(0.015nm)可在〜3mm范围内关闭超过〜3mm的灵敏度滚动。在很长的范围内测量,可能具有最小的灵敏度损失,但是从外部测量范围的反射出现在0-3mm的主体测量范围内别名回到主范围内。另外,从激光器输出的频率梳状在频率(k空间中的线性)等于间隔。滤波后的激光输出可用于自动送到OCT干扰信号采样,从而实现边缘信号的直接快速傅里叶变换,而无需条纹重新校准程序。讨论了FC扫描激光器的设计和操作原理,提出了干涉测量应用。

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