title: Dual wavelength Q-switched cascade laser.
abstract: A diode-cladding-pumped dual wavelength Q-switched Ho3+-doped fluoride cascade fiber laser operating in the mid-infrared is demonstrated. Stable pulse trains from the (5)I6 → (5)I7 and (5)I7 → (5)I8 laser transitions were produced, and the μs-level time delay between the pulses from each transition was dependent on the pump power. At maximum pump power and at an acousto-optic modulator repetition rate of 25 kHz, the (5)I6 → (5)I7 transition pulse operated at 3.005 μm, a pulse energy of 29 μJ, and a pulse width of 380 ns; the (5)I7 → (5)I8 transition pulse correspondingly produced 7 μJ pulse energy and 260 ns pulse width at 2.074 μm. To the best of our knowledge, this is the first demonstration of a Q-switched fiber laser operating beyond 3 μm.
authors: Institute of Photonics and Optical Science (IPOS) and Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), School of Physics, University of Sydney, Camperdown 2006, Australia. lijianfeng@uestc.edu.cn
authors: Jianfeng
authors: J
authors: Li
authors: Tomonori
authors: T
authors: Hu
authors: Stuart D
authors: SD
authors: Jackson
mesh_terms: D005459:Fluorides; D007834:Lasers; D055620:Optical Phenomena
chemical_list: D005459:Fluorides