【摘要】 超连续光谱以其光谱范围宽、平坦度好、空间相干度高和可实现的较高功率,被广泛应用于相干成像技术、光谱分析、干涉测量等诸多领域。理论上超连续光谱可由超短脉冲通过高非线性介质来实现,期间伴随着自相位调制(SPM)、受激拉曼散射(SRS)、四波混频效应(FWM)。随着光纤技术的发展,利用峰值功率高、光光转换效率高、体积小、结构紧凑的掺Yb超短脉冲光纤激光器作为泵浦源,高非线性的光子晶体光纤作为非线性介质来产生超连续光谱。采用主振荡功率放大结构(MOPA),自行搭建了全光纤锁模脉冲放大器,并通过熔接的方式将其耦合进入长为10 m、零色散点为1 040 nm的光子晶体光纤,在对熔接过程中放电时间、放电间隔、熔接损耗等参数进行优化后,获得了8.14 W的超连续光谱。更多还原

【Abstract】 Super-continuum(SC) is widely used in coherent photography technology,optical spectroscopy analysis,interferometry,etc because of its flat and broad spectrum,high spatial coherence and high power. Super-continuum generation could be realized on theory by ultra-short pulse laser getting through the high nonlinear medium,accompany with self-phase modulation(SPM),stimulated Raman scattering(SRS),four-wave mixing(FWM). With the development of fiber technology,Yb-doped ultra-short pulse fiber laser,which has high peak power,high optic-to-optic efficiency,compact structure and small volume was elected as the pump source,and high nonlinear photonic crystal fiber(PCF) as the nonlinear medium for SC. In this paper,a self-made amplified mode-locked pulse was coupled into a 10 m PCF,with 1 040 nm zero dispersion point,to generate 8.13 W super-continuum by fusing method,during which the key parameters like discharge time,discharge interval,splice loss are seriously optimized to keep the fusing quality well.更多还原