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基于非线性薛定谔方程建立了氟化物(ZrF_4-BaF_2-LaF_3-AlF_3-NaF,ZBLAN)光纤振荡器中产生中红外超短脉冲的理论模型,在此基础上研究了中红外超短脉冲在氟化物光纤振荡器中形成的物理机理,数值模拟了氟化物光纤振荡器中中红外超短脉冲的演化过程.分析了腔内净色散和小信号增益系数对振荡器中锁模脉冲产生的影响,并给出了参数设置范围.研究发现:当掺Er~(3+)氟化物光纤长度,小信号增益系数,不饱和损耗为一定值时,腔内净色散在一定范围内才会出现稳定的锁模脉冲,且随着腔内净色散增加脉冲宽度变宽,光谱变窄,峰值功率降低;当掺Er~(3+)氟化物光纤长度及不饱和损耗一定,腔内净色散量为合理值,小信号增益系数在合理的范围时可以得到稳定的锁模脉冲,且随着小信号增益系数的增加脉冲宽度变宽,光谱变宽,峰值功率增加.
Based on the nonlinear Schrödinger equation, a theoretical model for generating mid-infrared ultrashort pulses in fluoride (ZrF 4 -BFF 2-LaF 3 -AlF 3-NaF, ZBLAN) optical fiber oscillators was established. Based on this, Optical fiber oscillator, the numerical simulation of the evolution of the mid-infrared ultrashort pulse in a fluoride fiber oscillator is performed.The effects of the net dispersion and the small signal gain coefficient on the mode-locked pulse in the oscillator are analyzed The range of parameter setting is given.It is found that when the length of doped Er3 + fluoride fiber, the gain coefficient of small signal and the loss of unsaturation are constant, the net lock of the cavity will appear stable within a certain range And the pulse width becomes narrower and the peak power decreases with the increase of net chromatic dispersion in the cavity. When the length of doped Er3 + fluoride fiber and the loss of saturation are constant, the net dispersion in the cavity is a reasonable value , A stable mode-locked pulse can be obtained when the small-signal gain coefficient is within a reasonable range, and the broadening of the pulse width and the broadening of the spectrum and the increase of the peak power as the small-signal gain coefficient increases.