| 摘要 |
<p>A spectrometer includes a source of light (12), a slit member (18) along the path of the light emitted from the source, a holographic, concave grating (24) in the path of the light passing through the slit member, and a photodetector (28) in the path of the diffracted light reflected from the grating. The photodetector (28) is positioned substantially along the portion of the primary horizontal focal curve of the grating where it is intersected three times by a vertical focal curve of the grating. The three intersections are on the same side of the normal vector to the grating and two of the intersecting points being the positions of the laser used to form the grating.</p> |
