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报道了一个光纤型1300nm波段的傅里叶域锁模(Fourier domain mode locking,FDML)扫频激光光源,用于扫频光学相干层析成像技术(optical coherence tomography,OCT)成像.本实验扫频激光光源采用包含增益介质、调谐滤波器和延迟线组成的长腔激光谐振腔以及光功率增强单元.FDML扫频激光光源具有快速和高度稳定运转模式,相位稳定性好.基于法布里-珀罗调谐滤波器(fiber Fabry-Perot tunable filter,FFP-TF)的FDML扫频激光光源扫频范围为130nm,半高全宽为70nm,输出平均功率是11mW.与基于FFP-TF的短腔的扫频光源做了对比研究,FDML扫频光源速度从短腔的8kHz提高到了48.12kHz,对应生物组织OCT成像轴向分辨率为7.8μm,比短腔的减小了1.9μm.
A fiber-optic Fourier domain mode locking (FDML) swept-frequency laser source was reported for optical coherence tomography (OCT) imaging at a wavelength of 1300 nm. The laser light source uses a long-cavity laser resonator consisting of a gain medium, a tuning filter and a delay line, and an optical power enhancement unit. The FDML swept laser light source has fast and highly stable operation mode and good phase stability. Based on Fabry- FDML swept laser source with fiber Fabry-Perot tunable filter (FFP-TF) has a swept frequency range of 130nm, a full width at half maximum of 70nm, and an average output power of 11mW. Compared with the FFP-TF based short cavity sweep The light sources were compared. The speed of FDML swept source increased from 8kHz to 48.12kHz in short cavity, and the axial resolution of OCT imaging in corresponding biological tissue was 7.8μm, which was 1.9μm smaller than that in short cavity.