(under subclass 333) Subject matter wherein the scattered light beam output from a medium, resulting from either the Raman or Brillouin effects, is amplified relative to the input to the medium.
(1) Note. The Raman effect claimed specifically for the optical amplification properties is classified in this subclass, whereas the Raman effect claimed for the frequency translation by itself or together with optical amplification is classified in subclass 327.
(2) Note. Stimulated Raman effect is the amplification exhibiting the characteristic of stimulated emission of the small portion of light that is scattered in random directions when a monochromatic light beam of high intensity is transmitted through matter. The characteristic of the small
portion of light is related to the frequencies of the matter.
(3) Note. The Raman effect results in the re-radiation of light from a bombarded molecule, having a longer wavelength than the original bombaring beam of coherent light. Part of the energy of the coherent beam is distributed throughout the molecule whereas the remaining energy is re-radiated. This effect may be described as being feeble, instantaneous, independent of absorption, independent of the wavelength of the exciting radiation; and it results in the re-emission of light generally having a wavelength longer than the existing one. Although there is a difference in wavelengths or frequency between the wavelengths of each re-emitted spectral line, or Raman line, and the wavelength of the incident or exciting radiation; the intensity of Raman increases as the fourth power of the incident frequency except in the neighborhood of an absorption band, where the scattering intensity increases still more markedly.
(4) Note. Brillouin scattering is the nonlinear optical phenomenon of the spontaneous scattering of light in a medium by its interaction with sound waves passing through the medium
SEE OR SEARCH THIS CLASS, SUBCLASS:
327, for Raman type frequency translators. SEE OR SEARCH CLASS
