A method of delivering a desired relatively high optical power to a well tool in a subterranean well can include coupling to an optical waveguide an optical source which combines multiple optical frequency ranges, respective centers of the frequency ranges being separated by at least a peak shift frequency in a Raman gain spectrum for a corresponding pump wavelength generated by the optical source, and transmitting the desired optical power to the well tool via the optical waveguide positioned in the well. Another method of delivering optical power to a well tool in a subterranean well can include coupling to an optical waveguide an optical source, the optical source comprising a sufficient number of lasing elements to transmit the optical power, with the optical power being greater than a critical power for stimulated Brillouin scattering in the waveguide.
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