RESUMEN
We present the results of numerical simulation of a dissipative solitons mode-locked fiber laser working over 1.6 µm. First, systematic and computationally intensive analysis of high-energy-pulse nonlinear phase shift of a fiber laser was conducted, and we numerically simulated dissipative solitons pulse evolution. In addition, we employed a method named A/B ratio to decrease B-integral by changing the distribution of passive fiber in the ring cavity. This method inhibited the accumulation of nonlinear phase shift and effectively enlarged the pulse energy from 0.8 nJ to 3.6 nJ. Finally, we optimized linear chirp of the pulse by using a designed larger-mode-area fiber, and ultimately a 2.82-kW, 650-fs pulse was obtained.
RESUMEN
OBJECTIVE: To summarize clinical application of the distal island muscle flap of the gastrocnemius muscle for repairing the defects around knee and within the upper 2/3 of lower leg. METHODS: 18 patients with defects around knee and within the upper 2/3 of lower leg, were treated with the distal island muscle flap of the gastrocnemius muscle, including 12 cases with medial muscle head and 6 cases with lateral muscle head. The muscular flaps were covered with meshed split-thickness skin grafts. The wound at donor sites were closed directly. RESULTS: All the skin grafts and muscle flaps survived with superior infection at the wound edge in two cases. The patients were followed up for 8 months to 4.8 years with satisfactory cosmetic and functional results. CONCLUSIONS: The distal island muscle flap of the gastrocnemius muscle has a reliable blood supply, long pedicle and suitable thickness. It is an ideal method for repairing the defects around knee and within the upper 2/3 of lower leg.
