Erickson E F, Rabanus D
NASA-Ames Research Center, MS 245-6, Moffett Field, California 94035-1000, USA.
Appl Opt. 2000 Sep 1;39(25):4486-9. doi: 10.1364/ao.39.004486.
The collimated optical beam in a grating spectrometer may be circular or elliptical in cross section, so that different parts of the beam illuminate different numbers of grooves on the grating. Here we estimate the consequent loss in spectral resolution relative to that obtained with a beam that illuminates a fixed number of grooves. The effect reduces the intrinsic resolving power of the spectrometer by approximately 15%, exclusive of other contributions such as finite entrance-slit width.
光栅光谱仪中的准直光束在横截面上可能是圆形或椭圆形的，这样光束的不同部分会照亮光栅上不同数量的刻槽。在这里，我们估计相对于用照亮固定数量刻槽的光束所获得的光谱分辨率，由此产生的分辨率损失。这种效应会使光谱仪的固有分辨能力降低约15%，不包括诸如有限的入射狭缝宽度等其他因素的影响。
