席夫碱化合物的SERS与NIR FT-Raman比较研究

席夫碱化合物的ＳＥＲＳ与ＮＩＲＦＴ┐Ｒａｍａｎ比较研究叶勇胡继明郁鉴源＊周群＊曾云鹗（武汉大学分析测试科学系武汉４３００７２）＊（清华大学分析中心北京１０００８４）ＳＥＲＳａｎｄＦＴ┐ＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｉｃＳｔｕｄｙｏｆＳｃｈｉｆＢａｓ...     

光导纤维法研究Ag电极上咪唑的SERS

光导纤维法研究Ａｇ电极上咪唑的ＳＥＲＳ徐知三，刘海林，张传飞，胡继明，盛蓉生，王小华（武汉大学分析测试中心武汉４３００７２）（武汉大学环境科学系武汉４３００７２）ＳＥＲＳｏｆＩｍｉｄａｚｏｌｅｗｉｔｈＦｉｂｅｒ－Ｏｐｔｉｃ￥ＸｕＺｈｉｓａｎ；ＬｉｕＨ...     

一种探测光纤BSBS温敏效应的新方法

一种探测光纤ＢＳＢＳ温敏效应的新方法黄民双（长沙铁道学院长沙４１００７５）刘邦群（武汉大学物理学系武汉４３００７２）ＡＮｅｗＤｅｔｅｃｔｉｏｎＭｅｔｈｏｄｏｆＯｐｔｉｃａｌＦｉｂｅｒＴｈｅｒｍａｌｙＳｅｎｓｉｔｉｖｅＥｆｅｃｔｕｓｉｎｇＢＳＢＳＡｂｓ...     

苯并冠醚及苯并硒杂冠醚的振动光谱研究

苯并冠醚及苯并硒杂冠醚的振动光谱研究何莲胡继明叶勇牛菲谷莹红徐汉生（武汉大学分析测试科学系化学系武汉４３００７２）ＶｉｂｒａｔｉｏｎａｌＳｐｅｃｔｒａｏｆＢｅｎｚｏｃｒｏｗｎａｎｄＳｅｌｅｎａｃｒｏｗｎＣｏｍｐｏｕｎｄｓＨｅＬｉａｎ，ＨｕＪｉｍｉｎｇ...     

咪唑在铜电极上吸附行为的SERS研究

咪唑在铜电极上吸附行为的ＳＥＲＳ研究张传飞，徐知三，旷富贵，王小华，刘海林（武汉大学分析测试中心武汉４３００７２）（武汉大学环境科学系武汉４３００７２）ＳｔｕｄｙｏｎＴｈｅＡｄｓｏｒｐｔｉｏｎＢｅｈａｖｉｏｕｒｏｆＩｍｉｄａｚｏｌｅｏｎＣｏｐｐｅｒＥ...     

Cu电极上咪唑与苯并三唑共吸附的SERS研究

Ｃｕ电极上咪唑与苯并三唑共吸附的ＳＥＲＳ研究张传飞，旷富贵，徐知三，王小华（武汉大学环境科学系武汉４３００７２）（武汉大学分析测试中心武汉４３００７２）ＳｔｕｄｙｏｎＴｈｅＣｏａｄｓｏｒｐｔｉｏｎｏｆＩｍｉｄａｚｏｌｅａｎｄＢｅｎｚｏｔｒｉｚｏｌｅｏ...     

人工神经网络在拉曼光谱数据处理中的应用

人工神经网络在拉曼光谱数据处理中的应用刘海林，胡继明，徐知三，盛蓉生，王小华（武汉大学分析测试中心武汉４３００７２）ＡｐｐｌｉｃａｔｉｏｎｏｆＡｒｔｉｆｉｃｉａｌＮｅｕｒａｌＮｅｔｗｏｒｋｓｉｎＲａｍａｎＳｐｅｃｔｒｕｍＤａｔａＰｒｏｃｅｓｓｉｎｇ￥...     

两种新卟啉的FT－SERS光谱

两种新卟啉的ＦＴ－ＳＥＲＳ光谱周光明，盛蓉生，徐知三，王霆，熊亚，王小华，曾云鹗（武汉大学化学系武汉大学分析测试中心武汉４３００７２）（北京Ｂｒｕｋｅｒ公司北京１００８７１）ＦＴ－ＳＥＲＳＳｐｅｃｔｒａｏｆＴｗｏＮｏｖｅｌＰｏｒｐｈｙｒｉｎｓ￥Ｚｈｏ...     

咪唑在银电极上吸附行为的SERS研究

咪唑在银电极上吸附行为的ＳＥＲＳ研究徐知三，张传飞，旷富贵，王小华，刘海林（武汉大学分析测试中心武汉４３００１２）（武汉大学环境科学系武汉４３００７２）ＳｔｕｄｙｏｎＴｈｅＡｄｓｏｔｐｔｉｏｎＢｅｈａｖｉｏｕｒｏｆＩｍｉｄａｚｏｌｅｏｎＳｉｌｖｅｒＥ...     

细胞色素bc_1复合物结晶的显微共振拉曼光谱

细胞色素ｂｃ１复合物结晶的显微共振拉曼光谱何季平①岳文海①尤乃亭②李晓原②李五湖②陈震华③（①武汉工业大学材料研究与测试中心武汉４３００７０）（②香港科技大学化学系香港九龙清水湾）（③武汉大学化学系武汉４３００７２）ＭｉｃｒｏＲｅｓｏｎａｎｃｅＲａｍ...     

Ultraviolet-light generation in nitrogen-doped silica fiber

Nonlinear light transformations were observed in a nitrogen-doped silica fiber pumped with a Nd:YAG laser (lambda=1.06 microm) . Light generation in the spectral range 355-430nm was obtained with an efficiency of up to 2x10(-4) . The UV light was found to be the result of third-harmonic generation, stimulated Raman scattering of the third harmonic, and third-harmonic generation from the Stokes components of the pump light. Lasing based on the color centers of nitrogen-doped silica was observed in the range 380-430nm.     

Design and Fabrication of an Er-Doped Silica Optical Fiber with Six Photosensitive Subcores

A type of multi-core Er-doped photosensitive silica optical fiber （MC-EDPF） is proposed and fabricated, in which a high consistency Er-doped core is surrounded by six high consistency Ge-doped cores. The multi-core design can overcome the difficulties encountered in the design and fabrication of single-core EDPFs through a modified chemical vapor deposition method combined with solution doping technology, and there is a conflict between high consistency Er doping and high consistency Ce doping. The absorption of MC-EDPFs achieved 15.876dB/m at 1550mm and lOdB/m at 98Ohm. The refleetivity of the fiber Bragg gratings （FBCs） written directly on the MC-EDPFs is as much as 96.84%.     

Broadband amplified spontaneous emission from an Er(3+)-Tm(3+)-codoped silica fiber

A new type of amplified spontaneous emission (ASE) based on an Er-Tm-codoped silica fiber is reported. When the fiber was pumped at 980 nm, the emission yielded a 3-dB bandwidth over 90 nm (1460-1550 nm) without any external filters, which is twice larger than that produced by conventional Er-doped fiber ASE sources. We believe that the superposition of two ASE bands, one from Er ions near 1530 nm and the other from Tm ions near 1450 nm, results in the broad bandwidth. Temperature-dependent ASE powers and fiber-length-dependent spectra strongly suggest that photon-assisted energy transfer between the sensitizing ion, Er, and the acceptor ion, Tm, plays an important role in changes in the bandwidth's size.     

光纤中受激四光子混频和受激喇曼散射的联合效应

本文从掺杂多模石英光纤中同时记录到六对斯托克斯-反斯托克斯谱线,并在540—640nm的光谱范围内获得了受激四光子混频和受激喇曼散射联合产生的连续光谱带。在比较20m和200m光纤不同光谱特征的基础上,详细分析了受激四光子混频和受激喇曼散射谱线间的竞争和转化过程。 关键词：     

Stimulated raman scattering up to 10 orders in an optical fiber

This paper describes the experimental investigation of stimulated Raman scattering obtained from a multimode fiber. 10 orders of stimulated Stokes scattering of wavelengths in the 546–702 nm region were obtained from a 480m multimode, low-loss, graded-index quartz fiber pumped by a 532 nm frequency-doubled YAG-Nd laser beam with a pulse duration of 7 ns, output power of 0.7 MW and repetition rates of 5 and 10 pps.     

Power scaling of resonantly cladding-pumped, Yb-free, Er-doped LMA fiber lasers

The results of the recent major efforts in power scaling of resonantly cladding-pumped Yb-free Er fiber lasers are presented. Commercially available Yb-free Er-doped large mode area Er60-20/125 (LMA) DC fibers were tested in two regimes: (i), as a booster amplifier in a single-frequency (SF) MOPA configuration and, (ii), in a Bragg grating (FBG) based narrowband fiber laser configuration. We obtained ～28.5 W of output power at 1590 nm, the highest power reported so far out of Yb-free Er-doped LMA fiber with resonant cladding pumping. The achieved optical-to-optical conversion slope efficiency of ～56.6% is also believed to be the highest efficiency ever reported from Yb-free Er-doped fiber laser with resonant cladding pumping.     

Intensity dependence of the transient two-wave mixing by population grating in Er-doped fiber

Theoretical analysis of the transient two-wave mixing (TWM) of two continuous waves with rectangular phase modulation counter-propagating through the Er-doped optical fiber is presented. Approximate analytic solutions obtained for undepleted interacting waves of low power (neglecting large-scale saturation of the fiber optical absorption) and of high power (with significant spatially uniform large-scale absorption saturation) are complemented by numerical simulation for a broad region of the recording light power. The experimental dependence of the TWM efficiency on the recording power obtained for a single-mode fiber with ?640 ppm erbium concentration and with initial optical density ≈8.4 at λ = 1526 nm demonstrated the initial, growing and decaying parts predicted theoretically. The maximum experimentally observed relative TWM signal amplitude proved to be approximately 3 times lower than expected.     

熔石英棒-光纤构成的新型复合相位共轭镜的实验和理论研究

提出了一种新型的由熔石英棒和石英光纤组成的复合型相位共轭镜,其可运用于高重复频率激光输入系统中以改善光束质量.该复合相位共轭镜具有较高的受激布里渊散射反射率和受激布里渊散射损伤阈值以及较低的受激布里渊散射阈值等优点.实验中,在100 Hz重复频率下,最大获得了42.05%的受激布里渊散射反射率.根据实验条件,由耦合波方程及边界条件得到的物理模型,经数值求解后得到的结果和实验符合较好.且由理论结果提出了一种提高该复合型相位共轭镜工作状态的有效方法. 关键词： 复合型相位共轭镜 受激布里渊散射 熔石英 耦合波方程     

Generation of a compact high-power high-efficiency normal-dispersion pumping supercontinuum in silica photonic crystal fiber pumped with a 1064-nm picosecond pulse

Broadband normal dispersion pumping supercontinuum （SC） generation in silica photonic crystal fiber （PCF） is investigated in this paper. A 1064-nm picosecond fiber laser is used to pump silica PCF for the SC generation. The length of PCF is optimized for the most efficient stimulated Raman scattering process in the picosecond pump pulse region. The first stimulated Raman Stokes peak is located in the anomalous dispersion regime of the PCF and near the zero dispersion wavelength; thus the SC generation process can benefit from both a normal dispersion pumping scheme and an anomalous dispersion pumping scheme. The 51.7-W SC spanning from about 700 nm to beyond 1700 nm is generated with an all-fiber configuration, and the pump-to-SC conversion efficiency is up to 90%. In order to avoid the output fiber end face damage and increase the stability of the system, an improved output solution for the high power SC is proposed in our experiment. This high-efficiency near-infrared SC source is very suitable for applications in which average output power and spectral power density are firstly desirable.     

基于受激布里渊散射的波长间隔可变多波长光纤激光器

提出了一个基于自激发受激布里渊散射的波长间隔可变多波长光纤激光器.利用单模光纤中自激发产生的非线性布里渊增益和掺铒光纤的线性增益组成混合增益光纤激光器,从而使光纤激光器在室温下产生稳定的多波长输出.改变双折射光纤环镜滤波器中保偏光纤的长度,可以实现波长间隔可变多波长激光产生,提高了多波长光纤激光器操作的灵活性和实用性.实验实现了波长间隔从0.8 nm至0.076 nm可变的多波长激光产生,波长数随波长间隔减小而增加,间隔为0.08 nm的激光波长数达86.