Assertion: filter's function | /r/CapableOf | employ the barrier filter
Facets:
value: to pass the desired emission wavelengths
type: PURPOSE
Source sentences:
text: The function of the cube is to employ the excitation filter to tailor-make the excitation light reaching the fluorochrome; to ensure maximum reflection of the desired excitation light by the dichroic mirror; and finally to employ the barrier filter to pass the desired emission wavelengths yet block unwanted excitation light or specific unwanted emission wavelengths.