共查询到20条相似文献,搜索用时 125 毫秒
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腐植酸物质的表面增强拉曼散射E.J.Liang(梁二军)1,3,Y.H.Yang(杨育晖)3,W.Kiefer31.郑州大学物理工程学院郑州4500522.中国科学院化学研究所北京1000803.InstitutfuerPhysikalischeCh... 相似文献
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金刚石薄膜中SP ̄2/SP ̄3键价比拉曼光谱分析张兵临H,M.Philllips(郑州大学物理系郑州450052)AnalysisofSP ̄2/ SP ̄2/SP ̄3BondingRatioinDiamondThinFilmsbyRamanSpectr... 相似文献
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200 nm Supercontinuum Generated by Subpicosecond Optical Pulses and its Evolution Process Observation 总被引:1,自引:0,他引:1
XU Lei YAO Minyu LI Yuhua WU Jian CHEN Minghua ZHANG Jianfeng ZHANG Hongming LOU Caiyun GAO Yizhi 《Chinese Journal of Lasers》1999,8(4):289-293
Introduction Whenultrashortopticalpulseswithhighintensity(pumpinglight)areinjectedintodispersionshiftedfiber(DSF),duetothenonlineareffectsinfibersuchasselfphasemodulation(SPM),fourwavemixing(FWM),crossphasemodulation(XPM)andstimulatedRamanscatteri… 相似文献
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WU Jiada ZHONG Xiaoxia SUN Jian WU Changzheng LI Fuming 《Chinese Journal of Lasers》1999,8(2):189-192
1IntroductionThereisconsiderableinterestinnanostructured(NS)silicon(Si)materialsbothfromthefundamentalandappliedpointsofview.... 相似文献
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1064 nm激光抽运单模光纤受激喇曼散射的理论分析 总被引:1,自引:1,他引:0
基于已有理论模型,利用1 064 nm 连续波抽运源在不同抽运光强下对不同长度光纤抽运所产生的受激喇曼散射现象进行数值模拟,并对模拟结果作了分析.研究发现:发生受激喇曼散射现象时,抽运光强和光纤长度发生兑换;能量红移现象普遍存在,包括同阶Stokes光谱内部和不同阶的Stokes光谱之间.抽运光强越大,能量红移现象越明显. 相似文献
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单模石英光纤受激拉曼散射温度特性研究 总被引:2,自引:2,他引:0
研究了在不同温度下单模石英光纤的受激拉曼散射光谱,从实验和理论上分析了温度对拉曼散射光谱特性的影响,在脉冲调Q倍频YAG激光的泵浦作用下,获得了石英光纤一级斯托克斯光的拉曼频移、带宽及光强随温度的变化规律。实验表明随着温度的升高,拉曼频移逐渐增大,在一定的温度范围内拉曼频移和温度成线性关系。在相同的泵浦功率作用下,当温度较低时,拉曼光谱的级次较低, 低温对高阶斯托克斯光有抑制作用; 温度越低其阈值越高;而拉曼光谱的谱线宽度随温度的变化不是线性的,存在一个谱线宽度极大值点。理论和实验表明温度对光纤受激拉曼散射的光谱特性有直接的影响。 相似文献
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Zhi‐Wei Men Wen‐Hui Fang Yun‐Feng Ding Xiu‐Ping Sun Zuo‐Wei Li Biao Cao Jian Zuo Shu‐Qin Gao Dong‐Fei Li Guo‐Hui Lu 《Journal of Raman spectroscopy : JRS》2009,40(8):1039-1042
We demonstrated stimulated Raman scattering (SRS) of carbon disulfide (CS2) influenced by β‐carotene in a liquid‐core optical fiber (LCOF). Owing to the double fluorescence characteristics and large third‐order optical nonlinearity of β‐carotene, the high‐order Stokes lines, such as the seventh‐order Stokes line of CS2, can be observed at a relatively low input‐laser power. The thresholds of Stokes lines lowered with the addition of the carotenoid when the concentration of solution was within 10−12 and 10−7 mol/L; the threshold increments and intensities of Stokes lines were correlative with the fluorescence profile of β‐carotene: when the fluorescence intensity of the wavenumber region on the spectrum was high, the Stokes line intensity was also high and its threshold increment was small, and vice versa. These results are expected to be worthy of the applications on the tunable laser and the seeding laser. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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双折射色散阶跃光纤中拉曼效应和参量放大增益谱 总被引:1,自引:1,他引:0
在拉曼效应和参量放大共同作用下,当激光脉冲在双折射光纤中传输时,根据所遵循的耦合模方程,通过引入平行拉曼增益的洛伦兹模型,导出了当输入泵浦波偏振方向同双折射轴成45°角时,在双折射色散阶跃光纤中拉曼效应和参量放大共同作用所导致的增益,讨论并分析了在不同色散区增益谱随相关参量的变化。结果表明:由于拉曼效应、参量放大、双折射和色散的相互作用,导致增益谱的斯托克斯波与反斯托克斯波彼此不对称;在反常色散区,产生的增益以反斯托克斯波为主,在正常色散区则以斯托克斯波为主;当表征距离的级数m发生变化时,增益谱也随之发生变化,可以利用色散阶跃光纤在适当的级数m位置提取T频率脉冲。 相似文献
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Spectral broadening in Raman fiber lasers 总被引:1,自引:0,他引:1
We present an analytical theory based on wave kinetic equations that describes a Raman fiber laser (RFL) generation spectrum. It is shown both theoretically and experimentally that the quasi-degenerate four-wave mixing between different longitudinal modes is the main broadening mechanism in the one-stage RFL at high powers. The shape and power dependence of the intracavity Stokes wave spectrum are in excellent quantitative agreement with predictions of the theory. 相似文献
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J. Zuo Y.-J. Tian J. Chen Y.-C. Wang S.-Q. Gao G.-H. Lu Z.-W. Li 《Applied physics. B, Lasers and optics》2008,91(3-4):467-473
We demonstrate stimulated Raman Stokes (SRS) scattering of carbon disulfide (CS2) influenced by a natural dye named all-trans-β-carotene in a liquid-core optical fiber (LCOF). These Stokes emissions can acquire the extra effects of seeding or suppression, both of which result from the optical properties of the carotenoids. Then, the efficient control of the selective developments of the Stokes lines by the natural dyes is available in LCOFs. Especially, the low threshold of the high-order Stokes lines, such as the 2nd Stokes line of CS2, can be more easily obtained through the seeding effect. The saturation intensity of the 1st Stokes line can be suppressed more when the concentration of all-trans-β-carotene in CS2 becomes high. Simultaneously, the threshold of the 1st Stokes line increases with the addition of the carotenoids. This result is expected to be worthy of new SRS-based fiber light sources for bio-medicine applications such as photodynamic therapy. 相似文献
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塑料光纤拉曼散射的研究 总被引:1,自引:1,他引:0
给出了聚甲基丙烯酸甲脂(PMMA)塑料光纤(POF)的一级受激拉曼散射光谱,研究了一级斯托克斯光谱特点,测试了它的阈值,带宽,分析了拉曼光谱的形成机制,并将塑料光纤的拉曼光谱和石英光纤的拉曼光谱进行了比较。 相似文献