傅里叶域锁模扫频激光光源

Fourier-Domain-Mode Locking Swept Laser Source

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 locking （FDML） swept laser source is reported. The swept laser source is composed of a laser resonator and a power amplification unit. The laser resonator includes gain medium, tunable filter and delay line. Serial implementation of two semiconductor optical amplifiers is adopted in the laser as gain amplification. The tunable filter consists of polygon scanner and grating in Littrow configuration. The tuning speed of the developed swept laser centered at 1290 nm is 14.8 kHz with an average output power of 3 mW. The tuning range is 108 nm with 3 dB bandwidth of 61 nm. Swept laser source is one key element in optical-frequency-domain imaging system, and the development of this FDML swept laser source will promote the development of real time optical- frequency-domain imaging technology.