| http://www.w3.org/ns/prov#value | - olecular species and the second molecular species can take place; irradiating said refractive index modulation with an incident beam of monochromatic incident light having a wavelength and the incident beam having a radius, varying an angle of incidence of said light or the wavelength of said light through a range of angles or wavelengths respectively, said range including an angle or a wavelength
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