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	Infrared laser
释义	Infrared laser 英语例句库 Visitors can observe the guard screen of the infrared laser through the night vision snooper scope. 它的顶部是一个球型的高压电极，在下部底箱内有一直流高压电源。 A new type of digital phasometer applied to the infrared laser position-tracking system of mine hoister is introduced in the paper,which is based on FPGA and FFT algorithm. 主要介绍了在矿井提升机红外激光位置跟踪系统中一种新型数字鉴相器的研究方法,该方法是基于FPGA器件运用FFT算法完成的。原声例句 TED-Ed（视频版） In contrast, a self-driving car's LIDAR system, which stands for Light Detection and Ranging, uses a narrow invisible infrared laser. 相比之下，自动驾驶汽车的激光雷达系统，代表光探测和测距，使用一种窄的不可见的红外激光器。 VOA 常速 2016年3月合集 Combining infrared laser technology with a drone, Physical Sciences Inc. is developing an affordable device that can monitor a much larger area. 而将红外激光技术与无人机相结合的这家物理科学公司目前正在研发一种可以监控更大区域的廉价装置。趣味化学实验：Periodic Videos It was used in this piece of apparatus to shine in an infrared laser that’s like a heat ray at one frequency and it came out as twice the frequency. 它被用在这台设备中，以一种频率像热射线一样的红外激光照射，它以两倍的频率发出。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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Infrared laser

Laser