Читать книгу Patty's Industrial Hygiene, Physical and Biological Agents - Группа авторов - Страница 76

The optical radiation emitted by a laser can be in the UV, the visible, or the IR portion of the optical spectrum. Because of the quantum nature of the stimulated emission within the laser, only one or, in some cases, a few wavelengths of light are emitted. For example, the familiar argon laser emits most of its light in two wavelengths: 488 nm (blue) and 514 nm (green). The Nd:YAG laser emits most of its energy in the near‐IR portion of the spectrum at 1064 nm (1.064 μm) and a slightly weaker output at 1334 nm (1.334 μm). The mirrors and other optical components of the laser's resonant cavity are designed to favor a certain wavelength to enhance output power and suppress other wavelengths to aid in the production of a truly monochromatic output beam. Thus, it is always essential to specify the wavelengths at which a given laser is operating rather than to rely on naming the active medium to identify the laser system.