摘要
Spontaneous Raman emission(SpRE),traditionally viewed as a detrimental effect,impairing spectral purity and imposing fundamental limits on power scaling in conventional fiber lasers,is being harnessed as a novel mechanism to realize high-power incoherent light sources.Compared to previous methods that rely on rare-earth-doped amplified spontaneous emission(ASE),this approach offers superior cost-effectiveness and inherent wavelength flexibility,enabling access to unconventional spectral regions critical for emerging applications like photonic computing and optical coherence tomography(OCT).As a demonstration,we first generate SpRE in a passive fiber segment,and then efficiently amplify this incoherent seed via stimulated Raman scattering to achieve highpower output.The resulting fiber source operates at 1116 nm with 23.03 W output power,8.24 nm 3 dB bandwidth,and 60.6%optical-to-optical efficiency while exhibiting high temporal stability.The incoherent nature eliminates interference artifacts and makes this source highly favorable for applications such as laser-driven inertial confinement fusion,photonic computing,and OCT.
基金
National Natural Science Foundation of China(62305391)
Scientific Fund of National University of Defense Technology(25-02,ZK 23-24)。
