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in this study. The first is hollow sapphire,which has been shown to be an excellent waveguideThis is because the air–core refractive index (n=1)is greater than that of sapphire at 10.6 µm (n=0.67)for sapphire at 10.6 µm.
第一次看到的时候以为自己英语不好,后来看到了好几次,难道真的是折射率小于1??
从来只认为折射率真空中是最小的, |
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