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Generation of single frequency radiation from a semiconductor laser based on a special laser module (amplifying laser module) is presented. The multi-mode emission with the spectral bandwidth of 100A is converted to single mode one with a narrow bandwidth of 2A in the presence of external optical feedback. Wavelength tunability of the laser emission over the range of 4-10 nm is also shown. The results could be used in high speed optical communication, WDM and other applications.

Generation of Single Frequency Light From an Optical Feedback Special Laser Module