Читать книгу Patty's Industrial Hygiene, Physical and Biological Agents - Группа авторов - Страница 74

Coherence describes the uniform spatial relationship between all portions of the electromagnetic wave. Monochromatic refers to the highly purified color (i.e. one wavelength) produced by most lasers and the extremely narrow spectral band of radiation. Both of these concepts are illustrated in Figure 3.

FIGURE 3 Coherence. The coherent nature of laser light relates to both spatial and temporal coherence. Spatial coherence means that the light waves are in phase.