Single-Frequency Nd3+-Doped Phosphate Fiber Laser at 915 nm

Single-frequency distributed Bragg reflector fiber laser at 915 nm was demonstrated by using a 2.5-cm long Nd
³⁺
-doped phosphate fiber as the gain medium. An output power of 13.5 mW was obtained at an absorbed pump power of 240 mW. Our experimental results show that Nd
³⁺
-doped phosphate glass fiber is more efficient than Nd
³⁺
-doped silica glass fiber for single-frequency laser operation in the 900 nm wavelength range.