Laser: Laser is the abbreviation of "stimulated radiation optical amplification", which refers to a device that amplifies light through stimulated radiation. The light produced by laser is highly coherent, monochromatic and collimated.
Coherence: Coherence means that the phase relationship of light waves remains stable, so that light waves can interfere. Laser is highly coherent, which makes it possible for laser to be used in interference experiments and other applications.
Monochrome: Monochrome means that the frequency range of light wave is very narrow and there is only one specific wavelength. The monochromaticity of laser makes it very useful in spectral analysis and other applications that require precise wavelength.
Collimation: Collimation means that the light is parallel and will not diverge. Laser is usually highly collimated, which enables laser to propagate and focus at a long distance.
Laser system: A laser is a device that generates laser light. It includes excitation medium, optical elements, mirrors and other components for generating, amplifying and guiding laser beams.
Gain medium: Excitation medium is the key part of laser, which is used to generate excited state, thus amplifying light in the process of stimulated radiation.
Pulsed laser: Pulsed laser is a kind of laser beam which is discrete in time, and its intensity will increase in time interval.
CW laser: CW laser refers to the laser emitted continuously, and its light intensity remains stable.
Resonant cavity: The laser cavity is the space inside the laser for reflecting and amplifying light. It usually consists of two mirrors.
Laser beam focusing: laser beam focusing is to change the spot size and energy density of laser beam through lenses or other optical elements.
Laser irradiation: laser irradiation is to heat the surface of evaporation target by laser energy, which is often used for cutting, carving and surface modification.
Laser interferometer: Laser interferometer uses the coherence of laser to measure the optical path difference or the shape of an object.
These terms cover some important concepts and principles in laser technology. Laser is widely used in many fields, from scientific research to industrial manufacturing, and plays an important role.
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