Tm:YAG ceramic derived multimaterial fiber with high gain per unit length for 2 µm laser applications

Abstract

In this work, Tm:YAG (Tm:Y3Al5O12) ceramic-derived multimaterial fiber was fabricated by using the molten core method, which has a high gain per unit length of 2.7 dB/cm at 1950 nm. To our knowledge, this is the highest gain per unit length at 2 mu m band in similar Tm:YAG-derived multimaterial fibers. A distributed Bragg reflector (DBR) fiber laser was built based on a 10-cm-long as-drawn fiber. The achieved 1950 nm laser, which has a maximum output power of similar to 240 mW and a slope efficiency of 16.5%, was pumped by a self-developed 1610 nm fiber laser. What is more, an all-fiber-integrated passively mode-locked fiber laser based. on the 10-cm-long as-drawn fiber was realized. The modelocked pulses operate at 1950 nm with duration of similar to 380 ps, and the repetition rate is 26.45 MHz. The results described here indicate that the Tm:YAG ceramic-derived multimaterial fiber with high gain per unit length has promising applications in 2 mu m all-fiber fiber lasers. (C) 2020 Optical Society of America