A femtosecond-laser-written monolithic waveguide laser (WGL) oscillator based on a distributed-feedback architecture and fabricated in ytterbium-doped phosphate glass is reported. The device lased at with an output power of and a bandwidth of less than when bidirectionally pumped at . The WGL device was stable and operated for without degradation. This demonstration of a high-performance WGL opens the possibility for creating a variety of narrow-linewidth laser designs in bulk glasses.
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