The SBM series spectral broadening modules provided by LBTEK utilize unique spectral fine-tuning technology for the spectral broadening of narrow-linewidth continuous laser seed sources. Since the power amplification of narrow-linewidth fiber lasers is limited by the stimulated Brillouin scattering (SBS) effect in fiber materials, and the direction of stimulated Brillouin scattering in optical fibers is opposite to that of the incident light, in high-power amplifier systems, if stimulated Brillouin scattering occurs, it will generate significant back-reflected light in the system's optical fibers. This back-reflected light can enter and damage sensitive components, causing the entire system to malfunction. Therefore, once stimulated Brillouin scattering occurs in high-power systems, its impact can be considered fatal. The SBM series spectral broadening modules employ a phase modulation method to broaden the single-frequency laser from the seed source, dispersing the originally concentrated spectral signal power (on the order of MHz) over a wider frequency distribution (on the order of GHz). This significantly reduces the power of each frequency component and increases the linewidth of the Brillouin gain spectrum. Based on the fundamental theory of phase modulation, the output light from the seed source undergoes intelligent spectral modulation to achieve the goal of raising the SBS threshold.