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1.
用于准相位匹配的LD泵浦Nd:YAG946nm连续激光光源   总被引:1,自引:1,他引:0  
本文为泵浦质子交换准相位匹配波导器LiNbO3提供了激光光源,用808nm半导体激光器泵浦Nd:YAG晶体,在室温下获得946nm激光连续输出大于120mW,斜率效率9.8%,并且在国内首次实现了LD泵浦Nd:YAG/KNbO3473nm蓝色激光器的连续运转,报道了初步的实验结果并对此进行了详细的分析,提出了改进方案.  相似文献   

2.
LD泵浦Nd:YVO4/KTP/BBO紫外激光器   总被引:3,自引:0,他引:3  
本文报道在国内首次实现的LD泵浦的四倍频连续紫外激光器的实验结果.首先研究了LD泵浦的Nd:YVO4激光器,在普通平-平腔结构下,得到斜效率55.68%,激光输出波长1064nm;利用KTP作为倍频晶体,实现腔内倍频,在泵浦功率11.85W时得到绿光(532nm)输出1.35W,光-光转换效率11%;用BBO晶体进行外腔谐振倍频,得到紫外光(266nm)输出.  相似文献   

3.
提出如何克服准三能级再吸收损耗和抑制寄生振荡实现LD泵浦的Nd∶YAG 946nm激光器.在室温下946nm连续输出大于120mW,斜率效率接近10%,同时采用KNbO3晶体实现了腔内倍频的蓝色激光输出.对实验结果进行了分析并提出了改进措施.  相似文献   

4.
 采用腔外单次通过方式,测量了LiIO3晶体在532 nm皮秒脉冲下的受激拉曼散射。实验中观察到3级斯托克斯线(556.07,582.30, 611.76 nm)和1级反斯托克斯线(509.57 nm),由此可计算出其频率间隔为820 cm-1。测量了LiIO3晶体各级拉曼散射谱线的阈值和增益系数,受激拉曼散射的整体转换效率达到56%。基于LiIO3晶体实现了皮秒外腔式拉曼激光器的运转,双波长输出总转换效率为27%,最大输出能量1.4 mJ。  相似文献   

5.
设计并实现了473 nm和946 nm双波长输出的全固态Nd:YAG激光器.利用激光二极管端面泵浦Nd:YAG晶体,在三镜折叠谐振腔中插入Brewster窗片作为起偏器,通过周期极化晶体PPKTP内腔倍频获得473 nm蓝光输出.同时利用Nd:YAG激光晶体的热退偏效应,把Brewster窗片作为基频光输出耦合镜,实现946 nm激光输出.通过调谐PPKTP的温度,优化了倍频光和基频光的输出功率.泵浦功率25W时,实验获得了1.8W的473 nm倍频蓝光和0.8W的946 nm基频激光输出.  相似文献   

6.
提出并实现了由热键合直角棱镜与角锥棱镜构成的新型946 nm及473 nm单频非平面环形激光器.直角棱镜由无掺杂的YAG晶体和2 mm厚的Nd∶YAG晶体热键合形成,可提供激光增益、光路闭合及对946 nm激光起偏等多种复合功能.角锥棱镜由熔融石英材料构成,在环形永磁铁作用下,提供法拉第旋转作用.实验上实现了该结构的946 nm腔内倍频,并获得了473 nm单频单向激光输出.  相似文献   

7.
提出并实现了由热键合直角棱镜与角锥棱镜构成的新型946 nm及473 nm单频非平面环形激光器.直角棱镜由无掺杂的YAG晶体和2 mm厚的Nd∶YAG晶体热键合形成,可提供激光增益、光路闭合及对946 nm激光起偏等多种复合功能.角锥棱镜由熔融石英材料构成,在环形永磁铁作用下,提供法拉第旋转作用.实验上实现了该结构的946 nm腔内倍频,并获得了473 nm单频单向激光输出.  相似文献   

8.
全固态紫外激光器研究   总被引:7,自引:2,他引:5  
本文报道了具有增强谐振倍频腔的全固态紫外激光器研究半导体激光二极管(LD)泵浦的Nd:YVO4激光晶体产生波长为1064nm的近红外光,腔内倍频输出波长为532nm的绿光,再送入增强谐振腔进行四倍频,输出波长为266nm的深紫外激光产生深紫外激光的基频绿光输入阈值可低到2.5mW据我们所知,这是国内首次报道的全固态紫外激光器.  相似文献   

9.
任晓栋  刘建军  张文清 《物理学报》2012,61(18):183101-183101
利用第一性原理方法系统研究了不同应 变模式对LiMnO2和Li2MnO3输出电压的影响, 建立了输出电压与弹性常数及应变之间的关系. 发现所有应变对输出电压都是降低的, 且应变效应是各向异性的. 大部分的单轴应变5%时对输出电压的降低都小于0.1 V. 由于层状的电极材料层间的键合作用较弱, 且受脱锂后形成的锂空位影响较大, 当从锂层脱出锂时, 垂直于层方向的应变对输出电压影响较大; 而对Li2MnO3系统从过渡金属层中脱锂时, 平行于层的应变对输出电压影响更大. Li2MnO3骨架支撑的层状固溶体系中, 应变使高电压充电阶段的电压维持在截断电压之下, 并打开过渡金属层中锂的迁移通道, 产生较为持久的充电而可能获得较大的充电容量.  相似文献   

10.
利用高能离子研究了110 keV 的He+注入Al2O3单晶及随后230 MeV的208Pb27+辐照并在不同温度条件下退火样品的光致发光的特性. 从测试结果可以清楚地看到在375 nm,390 nm,413 nm 和450 nm 出现了强烈的发光峰. 经过600 K退火2 h后测试结果显示,390 nm发光峰增强剧烈,而别的发光峰显示不明显. 在900 K退火条件下,390 nm的发光峰开始减弱相反在510 nm出现了较强的发光峰,到1100 K退火完毕后390 nm的发光峰完全消失,而510 nm的发光峰相对增强. 从辐照样品的FTIR谱中看到,波数在460—510 cm-1间的吸收是振动模式,经过离子辐照后,吸收带展宽,随着辐照量的增大,Al2O3振动吸收峰消失,说明Al2O3振动模式被完全破坏. 1000—1300 cm-1之间为Al-O-Al桥氧的伸缩振动模式,辐照后吸收带向高波数方向移动. 退火后的FTIR谱变化不大.  相似文献   

11.
We have fabricated Cr3+ and Nd3+ co-doped YAG (Cr;Nd:YAG) ceramics, and investigated their optical properties and laser characteristics. The Cr;Nd:YAG has two broad absorption bands at around 440 nm (4A24T1) and 600 nm (4A24T2) respectively, caused by Cr3+ ions. In the case of pumping at 440 nm, the maximum effective lifetime of the Cr;Nd:YAG was 737 μs with a 0.1 at% Cr3+ and 1.0 at% Nd3+ co-doped YAG sample. Cr3+ ions take a role of an effective sensitizer to convert the UV light of flashlamp. For single-shot laser operation, a 10.4 J output energy at 1064 nm was obtained with 0.1 at% Cr3+ and 1.0 at% Nd3+ co-doped YAG ceramic rod with a laser efficiency of 4.9%. The laser efficiency was found to be more than twice that of a 1.0 at % Nd3+:YAG ceramic rod.  相似文献   

12.
邢颍滨  叶宝圆  蒋作文  戴能利  李进延 《物理学报》2014,63(1):14209-014209
掺Tm3+光纤激光器有着广泛的应用前景,而掺Tm3+光纤是其核心与关键.本文采用改进的化学汽相沉积(MCVD)工艺和气相液相复合掺杂技术,在MCVD机车上实现了掺Tm3+石英光纤预制棒的制备,并制备了掺Tm3+石英双包层光纤(芯包比为10/125).利用上述光纤搭建直腔型全光纤激光器,在波长为793nm的LD抽运下,获得激光光谱中心波长为2002 nm,最大的激光输出功率30.7 W,光纤斜率效率为59.32%.  相似文献   

13.
The characteristics of a 940 nm pumped Cr4+:forsterite laser have been investigated using a pulsed colour centre laser as the excitation source. Laser threshold, slope efficiency and temporal behaviour have been determined for high and low Cr4+ doped material. 940 nm pumping is found to be more efficient than 532 and 730–770 nm excitation. Discrepancies with 1064 nm pumping are attributed to excited state absorption. Absorption saturation measurements have been used to assess the potential applications of Cr4+:forsterite, Cr4+:YAG and Cr4+: Lu3A15O12 (LuAG) as passive Q-switches for Nd lasers in the 940 nm region.  相似文献   

14.
赵纯  张勤远  陈东丹  姜中宏 《物理学报》2007,56(7):4194-4199
研究了808 nm和977 nm激光二极管抽运下铥/镱共掺TeO2-Ga2O3-R2O(R=Li,Na,K)玻璃光谱特性.利用Judd-Ofelt 理论计算了Tm3+离子在碲镓酸盐玻璃中自发辐射跃迁概率、荧光分支比和辐射寿命等光谱参数.在977 nm激光二极管抽运下,观测到Tm3+/Yb3+共掺碲镓酸盐玻璃很强的476 nm上转换蓝光(1G43H6)和较弱的650 nm上转换红光(1G43H43F2,33H6).分析表明476 nm蓝光发射为三光子吸收过程,650 nm红光发射为双光子和三光子混合吸收过程;而在808 nm激光二极管抽运下,玻璃上转换蓝色荧光为双光子吸收过程.实验发现,随着碱金属离子半径的增大,977 nm激光二极管抽运下蓝光上转换发光强度增强,而用808 nm激光二极管抽运蓝光上转换发光无明显的变化. 关键词: 碲镓酸盐玻璃 铥镱共掺 Judd-Ofelt 理论 上转换  相似文献   

15.
Wavelength stabilization of the green Ar+ laser line at 514.5 nm by129I2 absorption was found to be more favourable than by127I2 absorption because the maximum of129I2 absorption is closer to the center of the 514.5 nm gain curve. A simple method for stabilizing a short air cooled laser with only one servo loop is given, yielding a stability of 10−8 λ.  相似文献   

16.
讨论了自启动被动锁模掺Yb3+光纤环形激光器产生短脉冲的机理,并研制出全光纤结构超短脉冲掺Yb3+光纤环形激光器.采用两个976nm半导体激光器级联抽运作为抽运源,高掺杂浓度掺Yb3+光纤作为增益介质,利用光纤的非线性偏振旋转效应,得到自启动、十分稳定的ps量级锁模光脉冲.激光器锁模阈值功率260mW,输出功率25mW,锁模光脉冲中心波长1056nm,3dB带宽11.7nm,重复频率20MHz.与其他结构光纤激光器相比,这种全光纤结构具有更高的效率和更好的稳定性. 关键词: 环形光纤激光器 3+光纤')" href="#">高掺杂浓度掺Yb3+光纤 自启动 被动锁模  相似文献   

17.
Spectrally pure high-power tunable single-mode operation of a pulsed Ti3+:sapphire laser by a tunable injection-seeding is reported. The injection laser was a cw diode laser pumped, spectrally narrowed tunable Cr3+:LiSrAlF6 (Cr3+:LiSAF) laser with a grating in the auxiliary cavity. Single-mode tunable operation of a pulsed Ti3+: sapphire ring oscillator was obtained at different wavelengths in the range between 818 nm and 848 nm with a typical linewidth of 0.006 cm-1. To extend the applicability of this operation to a differential absorption lidar system, the single-mode Ti3+:sapphire oscillator output was amplified and a high energy output of 38 mJ was obtained with the same linewidth.  相似文献   

18.
夏长明  周桂耀  韩颖  侯蓝田 《中国物理 B》2011,20(8):87802-087802
An Yb 3+ /Al 3+-codoped microstructured optical fibre is prepared based on photonic crystal fibre technology.The characteristic spectra of preforms and fibres are experimentally investigated.The results show that under a 971 nm excitation,besides the known infrared fluorescence luminescence around 1050 nm,a blue luminescence peak at 486 nm is obtained.Moreover,an unexpected emission peak at 730 nm is also observed.The photoluminescence mechanism of an Yb 3+ /Al 3+-codoped microstructured optical fibre is discussed.The emission peak at 486 nm is attributed to the cooperative upconversion resulting from pairs of Yb 3+ ions,and the emission peak around 730 nm is ascribed to the stimulated Raman scattering because of nonlinear effects of microstructured optical fibre.The Yb 3+ /Al 3+-codoped microstructured optical fibre is promising for varieties of applications from laser printing and optical recording to cancer treatments,such as photodynamic therapy.  相似文献   

19.
The upconverted VUV (185 nm) and UV (230 and 260 nm) luminescence due to 5d-4f radiative transitions in Nd3+ ions doped into a LiYF4 crystal has been obtained under excitation by 351/353 nm radiation from a XeF excimer laser. The maximum upconversion efficiency, defined as the ratio of intensity for 5d-4f luminescence to overall intensity for 5d-4f and 4f-4f luminescence from the 4D3/2 Nd3+ level, has been estimated to be about 70% under optimal focusing conditions for XeF laser radiation. A redistribution of intensity between three main components of 5d-4f Nd3+ luminescence is observed under changing the excitation power density, which favors the most long-wavelength band (260 nm) at higher excitation density level. The effect is interpreted as being due to excited state absorption of radiation emitted. The upconverted VUV and UV luminescence from the high-lying 2F(2)7/2 4f level of Er3+ doped into a LiYF4 crystal has also been obtained under XeF-laser excitation the most intense line being at 280 nm from the spin-allowed transition to the 2H(2)11/2 4f level of Er3+, but the efficiency of upconversion for Er3+ emission is low, less than 5%.  相似文献   

20.
A luminescent material β-Na(Y1.5Na0.5)F6 doped with Tm3+ was synthesized by a solid-state reaction method for a steady phosphor of blue upconversion. Under the 671 nm laser excitation, the green emission band of 511 nm due to the 1D23H5 transition is obtained for the first time, while the ultraviolet emission band is also observed at 368 nm, associated with the 1D23H6 transition. Especially, a wide band of blue emissions is obtained at the wavelength region of 440-490 nm, originated mainly from the 1D23F4 (450 nm) and 1G43H6 (471-487 nm) transitions, which have potential application in tunable solid-state blue laser of Tm3+. The upconversion mechanism is explored in terms of the energy-level structures of Tm3+ ion and the power dependence of upconverted emission intensity, which is believed to be performed by excited-state absorption.  相似文献   

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