| 摘要 |
PURPOSE:To permit measurement with high sensitivity by projecting signal light and laser light on an optical fiber, generating stimulated Raman scattering in the optical fiber to obtain the output amplifying the specific wavelength light of the signal light and changing the wavelength of the laser light. CONSTITUTION:Light 2 of energy omega1 is generated from a laser 1 and the scattered light 4 scattered by a sample 3 is put into the optical fiber 5. On the other hand, light of energy omega2 from a wavelength variable laser 6 is put through a semitransparent mirror 8 to the fiber 5. The stimulated Raman scattering arises in the fiber 5 and only the scattered light having the energy DELTAi is strongly amplified when the Raman shift quantity of the fiber 5 is designated as omega3 and the light 4 from the sample 3 is assumed to have the spectral structure shown by A and when omega2=omega3+DELTAi (i=0, 1...) is satisfied. The spectrum as the function of omega2 is obtd. when the energy omega2 is varied and the fiber output is detected 9. The axis of abscissa of this spectrum is omega2 and, therefore ordinary Raman spectral display is obtd. by determining the peak based on the overwhelmingly strong Rayleigh's scattered light as the origin of the energy and giving the axis of abscissa by the peak shift quantity.
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