The generation of 236 mW of second-harmonic power in a 32-cm-long periodically poled silica fiber, corresponding to an average conversion efficiency of 15.2+/-0.5%, is reported. This represents the highest normalized second-harmonic conversion and the highest average second-harmonic power ever reported for a periodically poled silica fiber, to our knowledge. The enhancement is attributed to an improved design of the specialty twin-hole fiber and the extension of the nonlinear interaction length.
ABSRTACT Mid-term (1 -1000 s) stability of the travelling-wave Er-doped fiber ring laser has been experimentally studied as a function of laser parameters: the pump power, the doped fiber length and type, the total laser cavity length, polarization control, and the exit coupler ratio. In all cases the total cavity length over ten meters resulted in a multi-wavelength generation with the comb central wavelength, defined by a 1 .12 GHz-band tunable Fabry-Pérot filter with a 3. 1 THz free spectral range. We have Ibund that the key parameters defining the laser stability are the cavity length and the outcoupling ratio, while the polarization control seems not very important for our multi-wavelength regime. Output power variations are less than 0.02 dB on a 1 0 mm interval were obtained.
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