Laser

Laser beams in fog, reflected on a car windshield

Components of a typical laser:1. Gain medium2. Laser pumping energy3. High reflector4. Output coupler5. Laser beam

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light coherently. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers. Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond.

单词	Energy beam
释义	Energy beam 原声例句连线杂志 Because our repetition rate is low, it gives the laser lots of time to charge up between pulses, which means a high energy beam, so that we can actually chew in and remove that material. 因为我们的重复率很低，它给了激光很多时间在脉冲之间充电，而这意味着高能量光束，这样我们就可以蚀刻并去除材料。经济学人 Culture Some conspiracy theorists claimed that the fires were caused by energy beamed from satellites, reviving an idea advanced in an online post from 2018 that attributed Californian wildfires to " space solar generators" . 一些阴谋论者声称，火灾是由卫星发出的能量引起的，这让 2018 年网上帖子中提出的一个想法重新焕发活力，该帖子将加州野火归因于“太空太阳能发电机” 。英语百科 Laser A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light coherently. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers. Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond.
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Energy beam

Laser