倍频傅里叶域模式锁定扫频激光源

Buffered Fourier Domain Mode Locking Laser

摘要:

搭建完成了基于单偏振助推光学放大器的傅里叶域模式锁定扫频激光源, 并在此基础上实现了倍频傅里叶域模式锁定扫频激光源, 将光源的成像速度提高了一倍。该倍频激光源输出功率达到2mW左右, 扫描频率为45kHz, 输出光谱的中心波长为1315nm, 光谱宽度为107nm。利用该光源进行相干层析成像实验时, 系统的A-Scan速率为90kHz, 纵向分辨率为12.9μm左右, 相干长度为0.9mm左右, 灵敏度为105dB。

Abstract:

Compared to the traditional biological imaging method, optical coherence tomography has lots of advantages, such as no injury, fast in imaging speed, three-dimensional imaging, high resolution, deep penetration depth and other characteristics, leading to very fast development. In this paper, a Fourier Domain Mode Locked laser (FDML) based on a polorization-dependent booster optical amplifier (BOA) is demonstrated and we build a buffered FDML laser which doubles the A-scan rate. The buffered FDML laser generates ~2mW output power at 45kHz sweep rate, and the tuning range is 107nm centered at 1315nm. The OCT system using the buffered FDML laser has the A-scan rate of 90kHz, with the axial resolution of 12.9μm and the sensitivity of 105dB.