报道了一种适用于平衡探测型光学相干层析(OCT)成像系统的透射式快速扫描光学延迟线(RSOD)。该透射式RSOD主要由反射型闪耀光栅、傅里叶透镜、快速扫描振镜、直角棱镜和反射镜组成,具备了反射式RSOD同样的相位调制、轴向扫描、调节色散功能。实验表明,基于透射式RSOD构建的平衡探测型OCT系统,与基于反射式RSOD的非平衡探测型OCT系统相比,图像质量明显提高。 A transmission fast scanning optical delay line (RSOD) for balanced detection optical coherence tomography (OCT) imaging system is reported. The transmissive RSOD is mainly composed of a reflective blazed grating, a Fourier lens, a fast scan mirror, a right angle prism, and a mirror, and has the same phase modulation of the reflective RSOD, axial scanning, and dispersion adjustment function. Experiments show that the image quality of the balanced detection OCT system based on the transmission RSOD is obviously improved compared with the non-balance detection OCT system based on the reflective RSOD.