Apparatus for generating an optical fiber laser capable of tuning a wavelength thereof

Abstract

An apparatus for generating an optical fiber laser capable of tuning a wavelength thereof. The apparatus comprises a pump laser to pump the light with changed polarization state, a light amplify fiber to produce a seed light using the pumped light from the pump laser at a certain operation wavelength and thereafter, when said seed light has stable frequency, to put out the light in that wavelength, a dispersion shift fiber to give a non-linear polarization effect to the output light from the light amplify fiber, a linear polarizer to tune the wavelength of the light from the dispersion shift fiber within a wavelength varying range, a light direction controller to give a certain oscillation direction to the tuned light, an optical element converging a light beam, with a cholesteric liquid crystal cell inserted, which transmits only a circularly polarized light having a consistent rotation period with the rotational direction of the liquid crystal surface and reflects all the rest of the light, and an output port to confirm a laser output light beam by putting out a certain portion of the light from said light converging element.