本文报导了在液氮温度范围内进行的微波受激发射的实验现象，工作物质是铬离子浓度为0.1％的人造红宝石。
An experimental observation on stimulated emission of radiation at liquid nitrogen temperature is reported. The paramagnetic material is synthetic ruby with about 0.1% chromium in Al2O3.
天然红宝石非常少见珍贵，但是人造并非太难，所以工业用红宝石都是人造的。
Ruby very rare precious natural, but not too difficult, so artificial industrial rubies are artificial.
天然红宝石非常少见珍贵，但是人造并非太难，所以工业用红宝石都是人造的。
Ruby very rare precious natural, but not too difficult, so artificial industrial rubies are artificial.
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