Abstract
The emission spectrum of a 10-W commercial broad-area laser operated at full power was narrowed and stabilized by coupling an off-axis portion of its far-field emission to a single-mode fiber Bragg grating. The feedback produced in this partial compound cavity configuration narrowed the FWHM linewidth of the laser by $7\times $ compared with the free-running case and stabilized its peak wavelength over a 7° temperature range. Furthermore, the feedback improved the spectral density of the emission by $2\times $ over a 1.5° temperature range and over most of the far-field emission angles, indicating a robust concept suitable for manufacturing. This proof-of-concept experiment can be translated into a fiber pump delivery system that can capture all the broad-area laser (BAL) output while providing feedback to improve the spectral and potentially spatial properties of BAL emission.
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