论文部分内容阅读
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。
The optical coherence imaging system based on the single-polarized semiconductor optical amplifier swept-frequency light source is completed and constructed. The system can realize high-speed optical coherence tomography and optical coherence microscopy. The swept-frequency light source in the system uses a polarization-dependent semiconductor optical amplifier as an amplification unit. The optical amplifier has the advantages of wide gain spectrum and high output power, so that the light source can obtain an appropriate gain spectrum width and output power with only one amplifier Fourier domain mode locking technique can be used to significantly improve the sweep rate. When the Fourier domain mode-locking technique is used, the output power of the swept-frequency light source reaches about 32 mW, the effective scanning frequency is 45 kHz, the center wavelength of the output spectrum is 1326 nm and the spectral width is 115 nm. When using the system for high-speed optical coherence tomography, the horizontal resolution is 9μm, the vertical resolution is about 12.9μm, and the sensitivity is 105dB. Using the system for optical coherence microscopy, we can clearly see the structure of onion epidermal cells.