激光者，亦音譯作雷射或鐳射（如亞洲電視節目【鐳射劇場】）。其以受激發光，且屬耗散系統，故其從熱力學第二定律。
原理
其以泵源供能，化學能，電能，是也。諧振光激之，使介質越遷激發態自基態，又蛻變作次激發態，假泵源之能而發之，其守熱力學第一定律，熱力學第二定律也。
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