Yang Qinghua
Appl Opt. 2016 Jun 20;55(18):4801-7. doi: 10.1364/AO.55.004801.
This paper presents a compact high-resolution Littrow conical diffraction spectrometer (LCDS) that includes an echelle grating for horizontally dispersing the incident light beam into several high diffraction orders, a prism for vertically separating the overlapping diffraction orders, and a shared focusing lens used for both the incident and dispersed beams. The unique design of the optics enables the LCDS to give high dispersion on the detector without requiring a large field of view and, therefore, to achieve the benefits of high spectral resolution and compactness. The use of the Littrow conical diffraction coupled with the shared focusing lens makes the LCDS more compact. The formulas of the footprint of the dispersed spectra are derived, and the numerical simulation is given. The design calculations for application of the LCDS to an optical coherence tomography system are illustrated by an example.
本文介绍了一种紧凑型高分辨率利特罗锥形衍射光谱仪（LCDS），它包括一个用于将入射光束水平分散为多个高衍射级次的阶梯光栅、一个用于垂直分离重叠衍射级次的棱镜，以及一个用于入射光束和色散光束的共用聚焦透镜。光学系统的独特设计使LCDS能够在探测器上实现高色散，而无需大视场，从而获得高光谱分辨率和紧凑性的优点。利特罗锥形衍射与共用聚焦透镜的结合使用使LCDS更加紧凑。推导了色散光谱覆盖区域的公式，并进行了数值模拟。通过一个例子说明了将LCDS应用于光学相干断层扫描系统的设计计算。
