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激光 极光 吉光 鸡光 机光 季光
激光(英语:Laser,马新称镭射,澳门称激光,香港称镭射,台湾称雷射),是“通过受激辐射产生的光放大”(英语:Light Amplification by Stimulated Emission of Radiation)的缩写,指通过刺激原子导致电子跃迁释放辐射能量而产生的具有同调性(Coherence)的增强光子束,其特点包括发散度极小、亮度(功率)很高、单色性好、相干性好等。产生激光需要“激发来源”、“增益介质”、“共振结构”这三个要素。

Photo by Vadim Sadovski on Unsplash
极光 是在高纬度的天空中,带电的高能粒子和高层大气中的原子碰撞造成的发光现象。带电粒子来自磁层和太阳风,在地球上,它们被地球的磁场带进大气层。大多数的极光发生在所谓的“极光带”,在观察上,这是在所有的经度上距离地磁极10°至20°,纬度宽约3°至6°的带状区域。太阳风受到地球的磁场导引直接进入大气层。

Photo by Lightscape on Unsplash

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