Difference absorption measurement and wavelength modulation harmonic measurement are two fundamental approaches for gas light absorption detection.

差分吸收检测和波长调制谐波检测是气体光吸收检测的两种基本方法。

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But a fundamental law of optics known as the diffraction limit states that the resolution can never be better than half the wavelength of light being looked at.

但是，一条被称为衍射极限的光学基本定律指出，显微镜的分辨率不会小于观察所用光源波长的一半。

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After the simulation, the relationship of fundamental mode loss with the core index, wavelength and the diameter of cladding air holes is given.

通过模拟，给出基模损耗同芯折射率、光波长和包层空气孔直径之间的一般规律。

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