数值研究蓝宝石光纤参数对产生超连续谱的影响

Numerical study of the effects of sapphire fiber parameters on the generation of supercontinuum

超连续谱激光器的发展受到诸多因素的影响,工作物质是影响其发展的主要因素之一,提高激光器输出谱线的平坦性与强度是其关键技术。本文选用数值模拟方法对皮秒脉冲在蓝宝石光纤中传输过程及产生的SC谱进行研究,其模拟结果表明,当蓝宝石光纤的非线性系数增大时,获得了更宽的输出脉冲频谱;当光纤二阶色散的数值增加时,频谱展宽的幅度有上升的趋势;当光纤长度的数值增大时,超连续谱有展宽的趋势,但超过一定阈值,平坦度反而下降。在激光器的实际设计中,该结果对产生可见及近红外超连续谱时,选择合适的蓝宝石光纤参数有重要的参考价值。

The development of supercontinuum lasers is affected by many factors,Working substance is one of the main factors affecting its development,Improving the flatness and intensity of laser output spectral lines is its key technology.This paper uses numerical methods to study the transmission process and supercontinuum of picosecond pulses in sapphire fiber,The simulation results show that,When the non-linear coefficient of bluestone fiber increases,Wider output pulse spectrum obtained;When the value of the fiber's second-order dispersion increases,The extent of spectrum broadening is on the rise;When the value of the fiber length increases,Supercontinuum has a tendency to broaden,But exceeds a certain threshold,Spectral flatness decreases instead.In the actual design of the laser,This result is useful for the generation of visible and near infrared supercontinuum,Choosing the right sapphire fiber parameters has important reference value.