Helium-Neon Laser
氦-氖激光器
The most common and inexpensive gas laser, the helium-neon laser is usually constructed to operate in the red at 632.8 nm. It can also be constructed to produce laser action in the green at 543.5 nm and in the infrared at 1523 nm.
最常见的、最经济的气体激光器——氦-氖激光器通常被设计为在632.8纳米的红色波长下运行。它也可以被设计成在543.5纳米的绿色波长和1523纳米的红外波长下产生激光作用。
The collimation of the beam is accomplished by mirrors on each end of the evacuated glass tube which contains about 85% helium and 15% neon gas at 1/300 atmospheres pressure (Metrologic). These mirrors could be both flat, but this requires great precision in alignment, so the common laboratory He-Ne lasers are manufactured with the semiconfocal mirror arrangement shown.
激光束的准直是通过真空玻璃管两端的镜子实现的，该玻璃管内填充约85%的氦气和15%的氖气，压力为1/300个大气压（Metrologic）。这些镜子可以都是平面镜，但这需要极高的对准精度，因此常见的实验室He-Ne激光器通常采用半共焦镜组排列制造。
The helium gas in the laser tube provides the pumping medium to attain the necessary population inversion for laser action.
激光管中的氦气提供了泵浦介质，以实现激光作用所需的粒子数反转。
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