Wide-Span Multi-Wavelength High-Power Diode-Laser Pumping of Fiber Raman Laser

摘要

A multimode silica-core fiber Raman laser was pumped directly by five wavelength-combined multimode diode lasers. The pump wavelengths were spread over a bandwidth of similar to 700 cm(-1), namely, at 976, 969, 950, 940, and 915 nm. This is larger than the Raman peak shift of 490 cm(-1). The output power reached 31.5 W with an overall slope efficiency of 42% at the wavelength of 1018 nm when pumped with the maximum launched power of 175 W. According to simulations, the fiber was under-length and the output power could double in a longer fiber. Our results suggest that pumping with spectrally combined diode lasers is a promising approach to high-power fiber Raman lasers, even when the pump wavelengths are not optimized.