Coordination engineering enhances 920 nm emission in Nd3+-doped silica fiber for high-repetition-rate ultrashort pulses laser

Although Nd3+-doped fibers have been utilized for the 920-nm ultrashort pulse generation, the competitive amplified spontaneous emission (ASE) at 1.06 mm remains a significant challenge in improving their performance. Here, we demonstrate a coordination engineering strategy to tailor the properties of Nd3+-doped silica fiber.

With elevating the covalency between Nd3+ and bonded anions via sulfur incorporation, the gain performance at 920 nm is enhanced proactively and 1.06-mm ASE intensity is suppressed simultaneously. Using this fiber, the continuous-wave laser efficiencies and signal-to-noise ratio at 920 nm were significantly enhanced, especially, the laser efficiency reached up to 27.4%, twice that of commercial Nd3+-doped silica fiber.