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报导了Yb :FAP和Yb :C3S2 _FAP晶体在不同温度下的吸收光谱和荧光光谱实验结果 ,研究发现由于电子_声子近共振耦合作用 ,Yb :FAP和Yb :C3S2 _FAP晶体均存在有明显的振动谱 ,Yb :FAP晶体的零声子线在低温下还劈裂为相差 10cm- 1 的两条线 .采用激光选择激发技术研究了Yb3 离子在FAP和C3S2 _FAP晶体中的格位特征 ,结果表明Yb3 离子在这两种基质中都只占据Ca(Ⅱ )格位 ,但由于CaF2 的挥发 ,导致了Ca(Ⅱ )格位的局部畸变 . 相似文献
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研究了自由电子激光实验观察到的由稳定波长反馈引起的新的振荡现象.数值模拟结果证实了实验中观测到的激光功率和电子束能量的周期性调制振荡,调制频率和调制深度与实验值符合较好.分析表明这种类极限环振荡主要起因于超辐射引起的频率蠕变. 相似文献
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锁模Yb:S—FAP激光器 总被引:1,自引:0,他引:1
本文首次报道了连续波Ti:Sapphire纵向泵浦主动锁模Yb:S-FAP激光器。实验得的最短锁模脉宽为35.4ps,通过特殊设计的定态激发光谱实验,我们对它的锁模特性进行了研究,因为从理论上说Yb:YS-FAP4nm的荧光线宽应能得到更短的变换极限脉宽。 相似文献
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Yb:FAP晶体的光谱特性 总被引:1,自引:0,他引:1
研究了Yb:FAP晶体的光谱特性.用980nm的InGaAs激光二极管激发测量了Yb:FAP晶体的偏振发射光谱和荧光寿命,结合晶体的偏振吸收光谱,采用对易法计算了晶体的吸收截面和发射截面.讨论了Yb3+掺杂浓度对Yb:FAP的光谱参数的影响.在较低掺杂浓度下,Yb:FAP晶体π偏振方向在903nm处的吸收截面为10×10-20cm2,在1.043μm处的发射截面为5.8×10-20cm2,激光上能级的荧光寿命为1.1ms.比较了Yb:FAP晶体和Yb:YAG晶体的光谱性能参数. 相似文献
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报道了一种适合中小功率输出的全固态激光器的角抽运方法, 抽运光从板条激光器中板条晶体的角部入射, 可获得较高的抽运效率和较好的抽运均匀性.采用单角抽运方式, 首次进行了角抽运Nd:YAG复合板条946 nm连续运转激光器的实验研究. 激光腔采用紧凑型平凹直腔结构, 腔长仅为20 mm. 当注入抽运功率为50 W时, 946 nm激光连续输出功率最高达5.29 W, 光光转换效率为10.6%, 斜效率为12%. 整台激光器结构紧凑, 调谐简单, 成本低, 具有广阔的应用前景.
关键词:
角抽运
Nd:YAG晶体
连续波
946 nm激光 相似文献
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Ping Yan Haisheng Wu Mali Gong Qiang Liu Chen Li R. Z. Cui W. P. Jia 《Optics and Lasers in Engineering》2004,42(4):413-419
A quasi-continuous wave laser diode side-pumped passively Q-switched Yb:YAG slab laser with Cr4+:YAG saturable absorber has been demonstrated in order to understand the pulse properties of Yb:YAG crystal. To our knowledge the maximum 69% extraction efficiency is achieved by the system. 44 μJ pulse energy and 1.64 KW peak power with near diffraction-limited beam quality are presented at 25 Hz repetition rate. The build-up time of the Q-giant in the passively Q-switched laser is shown. 相似文献
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The absorption and fluorescence spectra of Cr,Yb:YAG crystal were measured. There are two absorption bands at 940 nm and 968 nm although the absorption coefficient is lower than that of the absorption peak of Yb:YAG superimposed in Cr:YAG absorption peak. The emission peak intensity is 4 times lower than that of Yb:YAG, which may be caused by the existence of the ground state absorption of Cr4+ which quenches the Yb3+ emission intensity. Although the emission peak of Cr,Yb:YAG is lower than that of Yb:YAG, there is an advantage of this crystal which combines the saturable absorber and gain medium into one and can be a self-Q switching laser crystal if Cr,Yb:YAG crystal is pumped with high energy power. 相似文献
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The absorption spectra characters of the (Cr,Yb):YAG,Cr:YAG and Yb:YAG crystals are reported. In the absorption spectra of the (Cr,Yb): YAG crystal,there are two absorption bands at 937 nm and 968 nm respectively,which are suitable for InGaAs diode laser pumping;and there is an absorption band of Cr4+ near 1030 nm,which is suitable for passive Q switch laser output at 1.03 μm. This Cr-Yb-codoped crystal may be a potential material for compact,diode laser pumped passive Q-switched solid-state laser with efficient,high-stable. 相似文献
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Yb:YAG晶体中的色心 总被引:5,自引:0,他引:5
在用引上法生长的Yb:YAG晶体中,存在一个独特的色心,其吸收带位于375nm的625nm,随着Yb2O3掺杂浓度的增加,色心浓度增加,探讨了晶体生长过程中色心形成机理。高强γ射线辐照Yb:YAG晶体,诱导大量色心的形成。晶体中的 对激发态Yb^3+离子的荧光寿命具有流淬火效应,因此,Yb:YAG激光晶体需要经高温退火,消除色心的影响。 相似文献
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YANG Peizhi DENG Peizhen HUANG Guosong ZHAO Zhiwei CHEN Wei XU Jun 《Chinese Journal of Lasers》2000,9(1):91-96
1 Introduction Recently,withthedevelopmentofhighperformanceInGaAsdiodelasersinthewavelengthrangebetween0.9and1.1μm[1],greatatte... 相似文献
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LD端面泵浦腔内倍频Yb:YAG绿光激光器 总被引:1,自引:0,他引:1
报道了一种激光二极管(LD)端面泵浦10at%掺杂Yb:YAG激光晶体(4×4×1mm)和Ⅰ类临界相位匹配LBO的腔内倍频全固态绿光激光器.为了克服"绿光问题",采用了两个激光二极管偏振耦合系统.在双路泵浦功率为1.2W时,获得最高功率为40mW525nm的连续基模激光输出.在腔内插入Cr4+:YAG饱和吸收体被动调Q,在泵浦功率为1.2W时,可以获得平均功率为5.2mW,脉冲重复频率为2.44kHz,脉冲宽度为51.5ns,峰值功率为41.7W的515nm脉冲激光输出.输出波长发生变化,而且515nm脉冲激光输出的阈值仅为728mW. 相似文献
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KTP和7.5mol%Nb:KTP晶体在Nd:YAG激光中的倍频和和频 总被引:1,自引:1,他引:0
本文在获得精确的7.5mol%Nb:KTP晶体的Sellmeier主折射率色散方程的基础上,计算7.5mol%Nb:KTP晶体对1.0642μm和1.3188μmNd:YAG激光的倍频和和频的型相位匹配曲线.通过研究KTP和7.5mol%Nb:KTP晶体的主折射率,双折射率和相位匹配,可以看出Nb掺入KTP晶体后产生的折射率和双折射率的色散和各向异型的变化是引起KTP晶体相位变化的根本原因. 相似文献
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激光二极管泵浦Nd:YAG 946nm激光器及倍频研究 总被引:6,自引:2,他引:4
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:YAG946nm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
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We report a diode-pumped rod-type Yb:YAG laser amplifier operating at 1 kHz. Cryogenic cooling method was adopted to make the Yb:YAG crystal work with four-level behavior. A single-frequency fiber laser acts as the seed in an actively Q-switched Yb:YAG oscillator. The resonator delivers 5.75-mJ pulses at 1 kHz with a pulse duration of approximately 40 ns. The pulses were amplified to 61 mJ in a four-pass rod-type Yb:YAG amplifier with optical-to-optical efficiency of 24% in the main amplifier. The M2 parameter of the output laser is <1.4. 相似文献