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مهندسی شیمی::
تکرنگ، تکفام
When a beam of monochrome light is sent onto a solid object, the solid object will only emit electrons from a certain frequency of this light.
While the surface of a metal vacuum is illuminated with monochrome light, the surface will emit electrons if its frequency is more than a certain value g.
A laser is a common, visible object: from blackboard pointers to disco lights, we recognize lasers because they have a perfectly defined color - they are monochrome - and because the beams are straight.
The coherent stimulated amplification is then made by following a type of resonance which creates a very monochrome and guided beam of light following the axis of the cavity; the cavity being the mirror which is slightly transparent.
There are three characteristics for laser lighting: monochromicity, phase coherence, and directivity.
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