| 摘要 |
<p>A high passband transmission ratio in microscopic Raman spectral imaging and other applications is obtained by splitting a light beam from an objective lens into two orthogonal polarized components processed along laterally spaced paths through the same liquid crystal tunable filter (LCTF) and imaging lens. At least one of the beams from a polarizing beam splitter is rotated using a wave plate, to cause both beams to be polarized at the nominal plane polarization angle required at the input to the LCTF. Laterally spaced beams emerge from the LCTF to be focused through a same imaging lens, as a single image on a CCD photosensor array. This arrangement ideally achieves 100% transmission in the passband, compared to 50% if the light beam had been coupled directly to the LCTF.</p> |
