...Modern Optics) 纵向多模或多纵模：同时存在几个共振频 率 输出单模的方法：选模 8.5 激光的单色性 (Monochromaticity of laser) 4. 选模( Mode selection ) 第八章 现代光学 ( Modern Optics) (1)缩短腔长。
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“全自动纳米多孔氧化硅薄膜折射率和厚度测定系统”采用的测量方法是光的反射法，在选用氦氖激光作为、入射光源时，考虑到氦氖激光的单色性不会因为经过分束镜后发生变化；
The automatic system of measurement of the refractive index & thickness of NMSTF applies the reflection method to measure the parameters with the helium-neon laser as the incident light source.
激光具有良好的光学精密性和单色性。
Lasers may be popularly considered the essence of precision optics and purity of color.
激光出现以后，人们获得了高强度、高单色性的相干光源，在许多实际问题中，将遇到繁杂的菲涅耳衍射的计算。
Since laser appeared, pure monochromatic coherent light sources of high intensity have been achieved. In many practical problems, there are miscellaneous Fresnel's diffraction calculations.
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