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InGaAs/GaAsP strain-compensated multiple quantum wells (SCMQWs) and strained InGaAs/GaAsmultiple quantum wells (MQWs) were grown on GaAs substrates by metal organic vapor phase epitaxy(MOVPE). The results of double crystal X-ray diffraction (DCXRD) revealed that strain relief had beenpartly accommodated by the misfit dislocation formation in the strained MQW material. It led to thatthe full width half maximums (FWHMs) of superlattice satellite peaks are broader than those of SCMQWstructures, and there was no detectable room temperature photoluminecence(RT-PL)for the strained 相似文献
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Spectral Broadening in a Polarization-Maintaining Photonic Crystal Fibre by Femtosecond Pulses from an Optical Parametric Amplifier 总被引:4,自引:0,他引:4 下载免费PDF全文
The spectral broadening with the bandwidth of 83nm (1.2486-1.3318μm) in the 1.3μm region is achieved in a 0.2-m-long, polarization-maintaining photonic crystal fibre (PCF) with an average core radius of 1.8 μm, pumped by optical pulses at the wavelength 1.269μm, with the duration 25ors and the repetition rate 250kHz from an optical parametric amplifier. The polarization characteristics of the output spectra are also investigated. 相似文献
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泵浦波长对光子晶体光纤产生超连续谱的影响 总被引:14,自引:12,他引:2
采用钛宝石光参量放大器作为泵浦源,利用其输出波长可调谐性,研究了不同泵浦波长对光子晶体光纤中产生超连续谱的影响,结果表明光子晶体光纤中零色散点处的群时延和1.4 μm处的OH根离子的吸收对超连续谱的平坦度影响很大,并且泵浦波长离光纤的零色散点越远,产生的超连续谱平坦度越差,甚至在可见光区产生的各个频率峰还只是分离的,没有形成超连续谱.当泵浦波长为1.2 μm时,获得了带宽为300 nm~1350 nm的超连续谱,谱宽超过了两个倍频程. 相似文献
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利用800 nm飞秒激光脉冲作为光源,在标准通信单模光纤上直接刻写周期分别为100,200,300和400 m的长周期光纤光栅(LPFG),得到波长范围为1 280~1 680 nm的透射谱,分析研究了在不同刻写条件下LPFG透射谱的共振波长、透射深度和插入损耗等参数的变化。通过对比分析发现透射衰减与刻写长度、条数以及平台高度等有着一定的对应关系。优化实验参数制作出共振波长分别约为1 407,1 311,1 669,1 551 nm,透射深度分别约为24.0,22.3,27.8,23.4 dB,插入损耗分别约为2.5,1.7,3.2,2.0 dB的LPFG。 相似文献
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OPA泵浦保偏光子晶体光纤产生超连续谱和非线性特性的研究 总被引:12,自引:8,他引:4
采用波长可调光参量放大器作为泵浦源,对保偏光子晶体光纤的超连续谱的产生和非线性特性进行了实验研究.将光参量放大器产生的中心波长为1.27 μm,脉宽约为250 fs,重复频率为250 kHz和单脉冲能量只有92 nJ的光脉冲耦合进0.2 m长的保偏光子晶体光纤,实验中观察到了光谱展宽和非线性效应,在1.3 μm 波长区域获得了谱宽为83 nm (1.2486 ~1.3318 μm)的超连续谱. 相似文献
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Supercontinuum Gneneration and Modes Analysis in Secondary Cores of a Hollow-Core Photonic Crystal Fiber 下载免费PDF全文
We demonstrate the generation of supercontinuum spectra in three secondary cores of a hollow-core photonic crystal fiber pumped by femtosecond laser pulses, respectively. The supercontinuum spectra are mainly a result of the soliton self-frequency shift and an amplification of dispersive wave at visible wavelengths. Detailed mode simulations show that with the increasing core length, the modes transfer from "double-points" to "single-point" since the pump laser is more easily coupled into the two side cores of a secondary core when the core length is small. The simulation results also explain why the experimental observed far-field beam patterns of first two secondary cores are different. 相似文献
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