Accuracy of single-cut adjustment technique for double resonant Brillouin fiber lasers

•We analyze the errors of double resonance adjustment in Brillouin fiber laser.•Algorithm provides 1–7 MHz accuracy of the location of adjusted resonance peak.•With dual resonance Brillouin threshold was equal to 5 mW for 8-m length cavity.

We present a detailed error analysis of the algorithm for adjustment of double resonance in short-length Brillouin ring fiber laser. Adjusted laser cavity is simultaneously resonant for the pump and Stokes radiations. We demonstrate that this algorithm provides an accuracy of 1–7 MHz for the resonance peak location under conditions of regular uncertainties in measurement and cutting. Demonstrated approach is equally useful for the design of singlemode fiber lasers with ultra-narrow optical spectra, Q-switched Brillouin fiber lasers as well as for applications employing high power fiber cavities free from stimulated Brillouin scattering.