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Glossary

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Glossaries

Term Definition
Laser

The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation , a laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. Lasers differ from other sources of light because they emit light coherently. Spatial coherence allows a laser to be focused to a tight spot, enabling applications like laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over long distances (collimation), enabling applications such as laser pointers. Lasers can also have high temporal coherence which allows them to have a very narrow spectrum, i.e., they only emit a single color of light. Temporal coherence can be used to produce pulses of light—as short as a femtosecond. התקן הפולט אור קוהרנטי, מונוכרומטי (בתחום צר של אורכי גל) ומקביל (בעל פיזור נמוך). התופעה הודגמה לראשונה ב-16 במאי 1960 על ידי תיאודור מיימן. ההתקן משתמש באפקט הקוונטי של פליטה מאולצת, ומכאן שמו האנגלי. לאור לייזר יישומים רבים בתחומי המדע והטכנולוגיה.

Laser Diodes

A laser diode is an electrically pumped semiconductor laser in which the active medium is formed by a p-n junction of a semiconductor diode  

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