Phase-conjugating stimulated Brillouin scattering mirror for low powers and reflectivities above 90% in an internally tapered optical fiber

Abstract

A novel low-power phase-conjugating mirror based on stimulated Brillouin scattering in a quartz fiber with an internal taper is reported. A peak-power threshold as low as 500 W and a maximum reflectivity of 92% were obtained with 30-ns pulses from a Q -switched Nd:YAG laser. The maximum peak powers of 130 kW demonstrated a dynamic range of 1:260. Reliable operation in both single- and multiple-longitudinal-mode operation was observed with conjugation fidelities larger than 95%.