High-Efficiency Operation of a Tm3+, Ho3+ Co-Doped Alumino-Zirco-Fluoride Glass Fiber Laser Near Room Temperature

High-efficiency operation at two micrometers for a very short (less than 30 mm long) Tm3+, Ho3+ co-doped AZF glass fiber laser pumped by a Ti:sapphire laser has been demonstrated near room temperature. A cw output power of up to 150 mW with a slope efficiency of 37% was achieved using a 24.5-mm-long, Tm3+, Ho3+ co-doped AZF glass fiber at 15° C.