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A low-threshold multiwavelength Brillouin fiber laser with double-frequency spacing based on a small-core fiber 下载免费PDF全文
We demonstrate multiwavelength Brillouin fiber lasers (MWBFLs) with double-frequency spacing based on a small-core fiber (SCF) and a standard single-mode fiber (SMF), which have core diameters of 5 and 8.8 μm, respectively. Experimental results show that the SCF-based MWBFL exhibits a higher laser output power and a lower pump threshold. The output powers of the SCF-based MWBFL are > 1.4 times those of the SMF-based MWBFL. Moreover, the threshold power required to generate each channel of the SCF-based MWBFL is 59% that of the SMF-based MWBFL. When the same pump power of 180 mW is injected, the number of laser channels generated for the SCF-based MWBFL is 13, which is twice that generated for the SMF-based MWBFL. In addition, the SCF-based MWBFL exhibits good wavelength tunability from 1535 to 1565 nm and temporal stability over an hour. 相似文献
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在催化量级的二价钯和氧化剂的作用下,苯直接经碳氢键活化在酸性体系中室温下氧化偶联生成联苯。通过对各种催化剂、氧化剂、酸等因素对联苯产物生成的影响的考察,醋酸钯/过硫酸钾/三氟乙酸体系确定为最有效的反应体系,联苯收率在24 h内可达24%,转化数TON值为6.0。 相似文献
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We investigated nonlinear optical properties of ZnO-Nb2O5-TeO2 glass excited by a femtosecond laser with time-resolved four-wave mixing (FWM) technique. The unusual FWM signals were observed in samples with ZnO dopant. The mechanism for the optical nonlinearities was discussed. 相似文献
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We investigated nonlinear optical properties of ZnO-Nb2O5-TeO2 glass excited by a femtosecond laser with time-resolved four-wave mixing (FWM) technique. The unusual FWM signals were observed in samples with ZnO dopant. The mechanism for the optical nonlinearities was discussed. 相似文献
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A monolithic visible supercontinuum(SC) source with a record average output power of 204 W and a spectrum ranging from580 nm to beyond 2400 nm is achieved in a piece of standard telecom graded-index multimode fiber(GRIN MMF) by designing the pumping system. The influence of the GRIN MMF length on the geometrical parameter instability(GPI) effect is analyzed for the first time, to the best of our knowledge, by comparing the SC spectral region dominated by the GPI effect under different fiber leng... 相似文献
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Effect of four-wave mixing on electromagnetically induced transparency in Λ-type system with a two-photon probe field 下载免费PDF全文
Using density matrix equation, we calculate analytically as well as numerically the effect of the four-wave mixing (FWM) field on electromagnetically induced transparency (EIT) in the rubidium 5S_{1/2}-5P_{3/2}-5D_{5/2} Λ-type system with a two-photon probe field. The calculated results are in good agreement with Fulton's experimental results in 1995 Phys. Rev. A 52 2302. 相似文献
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江丽 《广东微量元素科学》2016,(4):35-37
目的分析健康教育对盆腔炎住院患者的积极影响。方法选取2013年4月—2014年11月江门市人民医院接收的87例盆腔炎患者为研究对象,将其分为对照组(44例)施以常规护理,观察组(43例)在对照组基础上进行健康教育,对两组患者的健康教育知识掌握程度、疗效及护理满意度进行比较。结果观察组疾病认知达标率为95.35%,对照组81.82%(P0.05);观察组总有效率为93.02%,对照组79.55%(P0.05)。结论健康教育可有效提高盆腔炎患者对疾病认知程度,提高治疗效果,进而增加护理满意度。 相似文献
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