In the preceding chapter the light waves discussed were referred to as single-wavelength or, what is the same thing, single-frequency waves. Waves which have this single-frequency property are said to have good frequency coherence. Light from a laser (particularly a gas laser) is said to exhibit an extremely high degree of frequency coherence. Because of the importance of wave coherence in holography, let us examine what the term coherence means.
KeywordsSound Wave Light Wave Spatial Coherence Frequency Stability Preceding Chapter
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