【摘要】 搭建完成了基于单偏振半导体光放大器扫频光源的光相干成像系统,此系统可以实现高速光相干层析成像与光相干显微成像。系统中的扫频光源使用偏振相关的半导体光放大器作为放大单元,该光放大器有着增益谱宽大、输出功率高的优点,使得光源仅使用一个放大器即可获得合适的增益谱宽与输出功率,并可采用傅里叶域锁模技术大幅提高其扫频速率。采用傅里叶域锁模技术时,扫频光源输出功率达到32 mW左右,有效扫描频率为45kHz,输出光谱的中心波长为1326nm,光谱宽度为115nm。利用系统进行高速光相干层析成像时,横向分辨率为9μm,纵向分辨率为12.9μm左右,灵敏度为105dB。利用系统进行光相干显微成像时,可以清楚地看到洋葱内表皮细胞的结构。更多还原

【Abstract】 As noninvasive biomedical imaging techniques,optical coherence tomography(OCT)and optical coherence microscopy have good application prospects in future.A swept-source imaging system based on a polarization-dependent semiconductor optical amplifier(SOA)enabled Fourier domain mode locked laser(FDML)is demonstrated,which can be used for the two imaging techniques mentioned above.The FDML with a polarizationdependent SOA generates~32 mW output power at 45 kHz sweep rates,with a tuning range of 115 nm centered at1326 nm.Because of the broad bandwidth and high saturation power of the polarization-dependent SOA,the laser has the advantage of simple structure.It uses only one SOA for operating with enough bandwidth and output power.Using the SOA-enabled FDML laser,an OCT system with axial resolution of~12.9μm,transverse spot size of 9μm and sensitivity of 105 dB is achieved.The structure of the epidermal cells of onion can be observed by this imaging system.更多还原