Opt Lett. 2018 May 15;43(10):2229-2232. doi: 10.1364/OL.43.002229.
We have developed, to the best of our knowledge, a new method of conducting spectrally encoded color imaging using a single light beam. In our method, a single broadband light beam was incident on a diffraction grating, where the overlapped third order of the red, fourth order of the green, and fifth order of the blue spectral bands were focused on a line illuminating tissue. This configuration enabled each point on the line to be illuminated by three distinctive wavelengths, corresponding to red, green, and blue. A custom grating was designed and fabricated to achieve high diffraction efficiencies for the wavelengths and diffraction orders used for color spectrally encoded imaging. A bench system was built to test the new spectrally encoded color imaging method. For a beam diameter of 174 μm, the bench system achieved 89,000 effective pixels over a 70° circular field. Spectrally encoded color images of excised swine tissue revealed blood vessels with a similar color appearance to those obtained via a conventional color camera. The results suggest that this single-beam spectrally encoded color method is feasible and can potentially simplify color spectrally encoded endoscopy probe designs.
据我们所知，我们开发了一种新的方法，利用单光束进行光谱编码彩色成象。在我们的方法中，一束宽带光入射到一个衍射光栅上，其中红色的三阶、绿色的四阶和蓝色的五阶光谱带的重叠部分被聚焦在线状照明组织上。这种配置使线上的每一点都被三个独特的波长照亮，对应于红、绿和蓝。设计并制造了一个定制的光栅，以实现用于彩色光谱编码成象的波长和衍射级的高衍射效率。建立了一个台架系统来测试新的光谱编码彩色成象方法。对于光束直径为 174μm 的情况，台架系统在 70°的圆形视场中实现了 89000 个有效象素。从猪组织中取出的光谱编码彩色图像显示出与传统彩色相机获得的血管具有相似的颜色外观。结果表明，这种单光束光谱编码彩色方法是可行的，并可能简化彩色光谱编码内窥镜探头的设计。
