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报道了一种傅里叶域锁模(FDML)的扫频激光光源。扫频激光光源由激光谐振腔和光功率增强单元组成,激光谐振腔主要包含增益介质、调谐滤波器和延迟线。增益介质采用了两个串联的半导体光放大器,调谐滤波器则采用了基于利特罗结构的光栅旋转多面镜。研制的FDML扫频激光光源的中心波长为1290 nm,扫频速度为14.8 kHz,扫频范围为108 nm,半峰全宽为61 nm,输出平均功率达3 mW。扫频光源是光学频域成像系统的关键部件,该扫频光源的研制将有力推动光学频域实时成像技术的发展。
A Fourier-domain mode-locked (FDML) swept-frequency laser source is reported. Swept-frequency laser source consists of laser resonator and optical power enhancement unit, the laser resonator mainly contains the gain medium, tuning filter and delay line. The gain medium uses two semiconductor optical amplifiers in series, while the tuning filter uses a grating rotating polygon mirror based on the Littrow structure. The developed FDML swept laser source has a center wavelength of 1290 nm, a sweep speed of 14.8 kHz, a sweep range of 108 nm, a full width at half maximum of 61 nm and an average output power of 3 mW. Swept frequency light source is the key component of optical frequency domain imaging system. The development of this swept frequency light source will promote the development of optical frequency real-time imaging technology.