In order to fabricate high-efficient flat broadband mid-infrared supercontinuum fiber

a microstructured fiber based on As

2

Se

3

as background material is proposed. By using nonlinear Schrodinger equation

the effects of fiber structure parameters on dispersion

loss and nonlinear characteristics are simulated

and the optimized structure is designed. The optimal structural parameters are selected to achieve high nonlinearity with flattened full normal dispersion. The mechanism of ultrashort pulse broadening is analyzed by using this structure optical fiber. The effects of fiber length

pump center wavelength

peak power and pump width on the generation of supercontinuum are studied

and the output of the flat mid-infrared supercontinuum is realized by this fiber. By building experimental platform

the transmission and output spectrum of femtosecond laser pulses in As

2

Se

3

microstructured fibers are measured by selecting the optimized fiber length and pump parameters. The experimental results show that high efficiency flat broadband mid-infrared supercontinuum with wavelength broadening of 3～6 μm can be generated. This continuous spectrum can be used in the fields of material detection

biochemistry

food detection and environmental analysis.