INTRODUCTORY NOTE This brief tutorial is meant to acquaint you with sources and detectors of optical radiation, and assumes that you know virtually nothing about them. It is meant to be read from beginning to end, first in a few hours, and later again as the need arises. Understanding the latter material of this treatise is simplified if you have read the earlier material, so start here, at the beginning. For your convenience, we underline important terms and abbreviations that you should become familiar with, the first time they are used. This will help you remember them.
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