共查询到20条相似文献，搜索用时 46 毫秒
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利用反射光栅调谐的脉冲ＴＥＡＣＯ２激光１０Ｒ（６）泵浦０．２ｍ长的小型ＮＨ３分子远红外激光器,当泵浦能量为１．１Ｊ,ＮＨ３分子气压为０．９ｋＰａ时,产生２９８μｍ的新谱线,对应Ｖ２：ａＲ（０,０）,受激喇曼跃迁。 相似文献
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一种获得1.3188μm单一谱线Nd:YAGTEM00模激光的新方法 总被引：2，自引：1，他引：1
提出了一种获得1.3188μm单一谱线Nd:YAGTEM00模激光的新方法,通过实验验证,取得了满意的效果. 相似文献
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实验研究了多(双)纵模和单纵模光泵NH_3分子系统的远红外激光输出特性,与理论计算作了比较,结果表明:在相同泵浦总功率条件下,适当控制激光器的工作参数,两者可产生相同的远红外谱线,能保持相同的波谱质量,并有大致相同的输出功率密度。 相似文献
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本文作者用高功率红宝石激光激发钠蒸汽，获得7条新的高离化态谱线，并证认其归属，实验结果与理论是一致的。 相似文献
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吕妍;孙伟通;冯其栋;陈淑贤;王云;王迪;李栋;李玉爽 《光电子技术》2024,44(4):338-344
针对应用可调谐半导体激光吸收光谱技术检测气体浓度过程中,待测气体特征吸收谱线选择影响检测系统性能及特征吸收谱线强度受温度影响的问题,基于HITRAN数据库开展了背景气体干扰下氢气特征吸收谱线选择及特征吸收谱线的温度依赖机制研究。结果表明：温度在200~300 K范围变化时,H吸光度曲线的峰值和半峰全宽均随着温度升高而减小,在峰值和半峰全宽的双重作用下,积分吸光度大幅下降;H总体配分函数随温度升高线性增长且其不同温度下的比值在谱线强度影响因素中权重最大,最终导致特征吸收谱线强度随温度升高递减。研究为基于可调谐半导体激光吸收光谱技术的氢气传感器温度补偿提供理论基础。 相似文献
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在水和乙二醇－甲醚体积比为1∶的混合溶液中制备了金属有机配合物非线性光学晶体材料；乙二醇－甲醚合硫氰酸汞锰（MMTG）晶体。该晶体具有较强的粉末倍频（SHG）效应，用半定量法测定其SHG强度与Urea晶体相当。该晶体具有较强的红外活性，用红外光谱表征了原子间的振动形式和配位情况。用X射线粉末衍射得到了其粉末衍射数据，对衍射数据进行了指标化，并得出MMTG属于正交晶系，其点阵参数a=1.6219800nm,b1.3502840nm,c=0.7295630nm,V=1.59784nm^2。利用指标化结果和X－射线衍射法（XRD）研究了单晶体生长面的取向。用SEM表征了其形貌。最后用X－射线四周衍射法所得的该晶体的结构数据与粉末衍射数据对比，结果符合较好。并最终确定了MMTG的空间群为p21/c。 相似文献
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超小型光泵远红外激光研究 总被引：8，自引：0，他引：8
在求解NH_3分子三能级系统密度矩阵的基础上,用迭代法计算了长为10cm—1.5cm的5支超小型光泵远红外激光器(OPFIRL)的输出激光能量密度和频谱特性.实验研制的5支超小型OPFIRL成功地产生了远红外激光.研究表明:纵向腔效应和横向反馈效应对超小型OPFIRL激光输出有积极作用,对最佳工作气体压强和频谱特性有重要影响. 相似文献
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Yi Li;Hong Zhang;Tao Chen;Ye Sun;Federico Rosei;Miao Yu; 《Advanced functional materials》2024,34(14):2312970
Energy cost is a long-neglected but crucial issue for electrocatalytic carbon dioxide reduction reactions (CO2RRs). So far, achieving efficient CO2RR at a low energy cost is a major unresolved challenge. Herein, energy-efficient CO2-to-CH3OH conversion by synergistically increasing the amount of favorable intermediates and depressing H2 generation is reported. The designed precursor electrocatalyst undergoes in situ reduction, forming Cu−C60 and ZnO−Cu dual interfaces. Cu−C60 induces an *H-rich surface, decreasing the hydrogenation barrier and lowering the required voltage. *H-modified ZnO-Cu alters the mechanism of electron transfer and improves the conversion selectivity. As a result, at an applied potential as low as −0.63 V versus a reversible hydrogen electrode, a cathodic energy efficiency of 50.5% and a faradaic efficiency of 78.3% for CH3OH is obtained. This work unlocks an unconventional route for improving the catalytic performance and energy efficiency of electrocatalysts, addressing the concern of energy costs for electrocatalyzed CO2RR. 相似文献
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本文对脉冲氧碘化学激光器的增益性能进行了理论估算。碘原子由CH_3I电离产生。研究了各种压力条件下成份比和CH_3I离解度对增益系数的影响。 相似文献
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从密度矩阵运动方程出发,详细地推导了光泵氨分子振动基态远红外激光的增益系数表达式。 相似文献
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在单晶硅薄片上用光刻方法制作了铝金属网栅,并用在亚毫米波F-P干涉仪上。适宜用作亚毫米波波长的测量和频谱特性的研究。 相似文献
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The spatial distribution of free carriers and excitons in perovskite micro‐/nanostructures is currently a major topic of debate. They have been reported to coexist with spatial separation in individual perovskite grains and films. It is revealed that free carriers and excitons in single‐crystal CH3NH3PbBr3 perovskite microplatelets can spatially overlap; however, the distribution is such that the edges can be entirely occupied by the former, while the interior is occupied only by the latter. This is further confirmed in single‐crystal CH3NH3PbBr3 perovskite microstrips, in which only free carriers are observed. These results may be attributable to electrostatic potential fluctuations on the edges, which can promote electron–hole separation so that they do not bind to form excitons. Microscopic I–V measurements demonstrate that the microplatelet edges and the microstrips show current densities of more than 260 and 340 A cm−2 in a dark environment under 1.2 V bias voltage, respectively. It is suggested that these findings mean that such microstructures hold promise for the development of novel perovskite micro‐/nanostructure‐based optoelectronic devices with interesting photoconductive properties such as high photoluminescence intensity, longer excited‐state lifetime, high conductivity, large saturation current densities, and suppressed hysteresis effects (smaller open voltages). 相似文献