Abstract
An analytical model for dual-end-pumped Nd 3+ -doped gain-guided and index-antiguided (GG-IAG) fiber laser is established. The corresponding analytical expression of the threshold pump power is obtained by solving the improved rate equations. Pump light propagation and threshold characteristics are both researched. Simulation results show that there are optimum values of N, a and L for the lowest P th . When a =50μm, L =9cm, N =1.8*10 20 cm −3 , R 1s =1, R 2s =0.75, the lowest threshold pump power P th of the GG-IAG fiber laser is about 11.95W, the results of the work may be helpful for the later experiments.
Highlights
The structure of the GG-IAG fiber is showed in fig
We report an analytical model for a dual-end-pumped Nd3+-doped GG-IAG fiber laser, and1an exact analytical expression of the threshold pump power for this ¿ber laser has been obtained by solving the improved rate equations (REs) with the additional leakage losses of the a corresponding author: weiwei@njupt.edu.cn signal light
All the parameters used in the calculations are given in table1
Summary
The structure of the GG-IAG fiber is showed in fig.. The refractive index of the fiber cladding n2 = n0, the refractive index difference of the core and the cladding is ǻn (ǻn
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