To begin with, the laser palette was rather limited: helium-neon and ruby lasers emitted red light, and others produced invisible infrared.
刚开始时，激光的色彩是相当有限的：氦氖激光器和红宝石发出红光，其他激光器则产生不可见的红外光。
To begin with, the laser palette was rather limited: helium-neon and ruby lasers emitted red light, and others produced invisible infrared.
刚开始时，激光的色彩是相当有限的：氦氖激光器和红宝石发出红光，其他激光器则产生不可见的红外光。
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