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Self-starting self-regulating Fourier domain mode locked fiber laser for OCT imaging

机译:自启动自调节傅里叶域锁模光纤激光器用于OCT成像

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摘要

We present a Fourier domain mode locking (FDML) fiber laser with a feedback loop allowing automatic startup without a priori knowledge of the fundamental drive frequency. The feedback can also regulate the drive frequency making the source robust against environmental variations. A control system samples the energy of the light traversing the FDML cavity and uses a voltage controlled oscillator (VCO) to drive the tunable fiber Fabry-Perot filter in order to maximize that energy. We demonstrate a prototype self-starting, self-regulating FDML operating at 40 kHz with a full width tuning range of 140 nm around 1305 nm and a power output of ~40 mW. The laser starts up with no operator intervention in less than 5 seconds and exhibits improved spectral stability over a conventional FDML source. In OCT applications the source achieved over 120 dB detection sensitivity and an ~8.9-µm axial resolution.
机译:我们提出了一种带反馈回路的傅立叶域锁模(FDML)光纤激光器,无需先验基础驱动频率即可自动启动。反馈还可以调节驱动频率,使信号源对环境变化具有鲁棒性。控制系统对穿过FDML腔的光的能量进行采样,并使用压控振荡器(VCO)驱动可调光纤Fabry-Perot滤波器,以使该能量最大化。我们展示了一个原型自启动,自调节FDML,其工作频率为40 kHz,在1305 nm左右的全宽调谐范围为140 nm,输出功率约为40 mW。与传统的FDML光源相比,该激光器无需操作员即可在不到5秒的时间内启动,并且具有更高的光谱稳定性。在OCT应用中,信号源的检测灵敏度超过120 dB,轴向分辨率约为8.9μm。

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