Increasing the SBS threshold by applying a flexible temperature modulation technique with temperature measurement of...

In this paper, we proposed a temperature modulation technique for the suppression of stimulated Brillouin scattering (SBS). This technique can achieve different kinds of temperature distributions in a high-power laser system with compact design and safe operation. We built up an experiment platform and a theoretical model to evaluate the performance of the temperature modulation technique by applying different temperature distributions along the gain fiber. A total of 3.3 dB SBS suppression can be achieved with only a 70 °C temperature gradient at 36 W output power in this experiment. During the experiment, optical frequency domain reflectometry (OFDR) was used to measure the temperature distributions of the gain fiber core under the effect of the temperature modulation technique. By further simulating and optimizing the temperature distributions, we can see the potential of SBS suppression rise to 3.5 dB with this temperature modulation technique. Through these studies, we demonstrated our temperature modulation technique with high flexibility and great potential for SBS suppression in a high-power single-frequency laser system.