The scientists have a big interest in conversion of radiation and possibility of stimulated reaction on a few wavelengths in different spectral ranges; as example, for laser-emitted wavelength and connected with its harmonic ones. For thin films a shape of the spectral characteristics from the range of the first harmonic is multiplied to all higher harmonics ones. However, a narrow-bandpass of Fabry-Perot filter, associated with the wavelength or frequency for which the spacer layer is half-wave, also exists at those wavelengths or frequencies for which the spacer layer is odd multiples of half-wave. Thus, there is narrow-pass-band not just for λ_o, but for λ_o/3, λ_o/5, λ_o/5 and so on.
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