低掺杂浓度Nd:YVO4激光器的输出特性研究

在对Nd:YVO_4晶体的掺杂浓度和晶体长度对激光器性能的影响进行了分析后,报道了利用掺杂浓度为0.3at％,通光长度为10mm的Nd:YVO_4晶体作为增益介质,带光纤耦合的激光二极管端面抽运的Nd:YVO_4激光器。在抽运功率为27.365W时,获得了14.85W的TEM_(00)模输出,光一光转换效率为60.49％,斜效率达64.5％。     

大功率激光二极管端面抽运的Nd：YVO4激光器

报道了利用掺杂浓度为0．3at．-％，通光长度为10mm的Nd：YVO4晶体作为增益介质，带光纤耦合的激光二极管端面抽运的Nd：YVO4激光器。在抽运功率为27．365W时，获得了14．85W的TEM00模输出，光-光转换效率为60．49％，斜率效率达64．5％。在上述基础上对晶体的掺杂浓度和晶体长度对激光器性能的影响进行了分析。     

激光二极管端面泵浦Nd：YVO41064nm激光特性研究

对多种掺杂浓度、长度的Ｎｄ：ＹＶＯ４晶体进行了吸收性质、激光性质的研究和对比,根据实验结果和测得的上能级寿命计算了不同掺杂浓度Ｎｄ：ＹＶＯ４晶体的有效受激发射同,对激光二极管端面泵浦Ｎｄ：ＹＶＯ４固体激光器的最优化有实际指导意义。     

Nd:YAG激光器输出特性的研究

运用激光谐振腔的矩阵理论，详细分析了内含热透镜的平－平腔的稳定特性。在理论分析的基础上，设计了腔参数进行了实验验证。在实验中还分别测量了谐振腔失调角度及棒相对谐振腔轴线的倾斜角度对激光输出功率的影响。     

LD端面泵浦固体激光器理论在测量Nd：YVO4晶体有效受激发射截面中的应用

对四种掺杂浓度的Nd:YVO4晶体进行了激光性质的研究和对比，从LD端面泵浦固体激光器的理论出发，结合实验数据计算了相应晶体的有产受 射截面σe。结果表明，随Nd^3 浓度的提高，Nd:YVO4晶体的有效受激发射截面σe逐渐增大，上能级寿命Te不断减小，两者的乘积在2at.%附近达到最大值。     

LD泵浦Nd：YAG946nmCW激光器研究

文章简述了Nd:YAG946nm激光器特别是LD泵浦的Nd:YAG946nm激光器的发展,在国内首次实现了LD泵浦Nd:YAG946nm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。     

Nd3+掺杂浓度对无水冷Nd:YAG激光器输出特性的影响

无水冷Nd:YAG激光器采用一种双拱形激光二极管阵列对双棒串接的Nd:YAG进行同心泵浦,将双拱形激光二极管面阵发出的光作高斯光束处理,利用高斯光束通过光学系统的变换规律,借助计算机模拟,研究了钕离子掺杂浓度对LD泵浦的无水冷Nd:YAG激光器的荧光分布、激光建立时间、输出能量及脉宽等输出特性的影响.搭建双半环形LDA侧面泵浦的低频无水冷电光调O Nd:YAG激光器的实验平台,对Nd3+掺杂浓度分别为1%、0.8%、0.6%的激光晶体进行实验测试,给出了LD泵浦的无水冷Nd:YAG激光器的Nd3+掺杂浓度与激光建立时间、输出能量、脉宽等参量的定量关系曲线,实验结果与理论分析结果基本相符.     

两个激光二极管端面泵浦的基横模Nd：YAG激光器

用两个功率为１．５Ｗ的连续激光二极管偏振耦合端面泵浦及分别从双端同时泵浦Ｎｄ：ＹＡＧ激光器，ＴＥＭ００模ＹＡＧ激光最大输出功率分别为６８０ｍＷ和４９２ｍＷ，总的光－光转换效率分别为２６．４％和１７．７％。从理论上对二极管单端面及双端面泵浦的ＹＡＧ激光器进行了分析计算。     

激光二极管泵浦高效Nd：YVO_4激光器特性研究

报道了激光二极管泵浦高效Ｎｄ：ＹＶＯ４激光器输出功率及波长特性的研究。基频光输出２３０ｍＷ，光－光转换效率为４５％。对激光输出波长和泵浦功率的关系进行了研究，发现激光器的输出波长随泵浦功率的平均变化率约为１．０５×１０－３ｎｍ／ｍＷ。利用ＫＴＰ腔内倍频获得２９．８ｍＷ的绿光输出，光－光转换效率为１２．４％。     

BF2^＋注入对PMOS晶体管开启电压的影响

文章研究了BF2^ 注入对PMOS晶体管开启电压的影响,试验发现,在我们的工艺条件下,BF2^ 注入能量是影响PMOS管开启电压的主要因素,能量高于67．5kev的BF2^ 注入可导致开启电压正漂,而退火对开启电压正漂没有影响,F离子也没有促进B穿透。     

偶氮苯聚合物薄膜光致表面调制效应研究（Ⅱ）

实验观测了DP-AN系列偶氮苯聚合物薄膜在Ar^ 激光（488nm）激发下的光致表面调制效应。给出488nm激光激发条件下,含有不同偶氮苯侧基的聚合物的光致表面调制效应的数值。在前文^[1]工作的基础上分析比较了DP-AN系列和BP-AN系列偶氮苯聚合物光致表面调制效应的不同及其产生的原因。给出影响偶氮苯聚合物光致表面调制效应的因素。     

NO分子Α~2Σ~+和Ε~2Σ~+能级的LIF光谱

本文报道了单光子激发NO分子A~2∑~+(υ=0)能级的LIF光谱研究,其观测到A~2Σ~+(o=0)→X~2Ⅱ(1″=0～11)跃迁的12个振动带。运用两步激发的方法,研究了E~2Σ~+(扣=0)能级激发后在紫外波段的LIF光谱,明显测量到了E~2Σ~+(1=0)能级直接跃迁到基态X~2Ⅱ的荧光振动带。     

新型Q开关材料Cr^4＋：YAG的研究概况

Cr^4 ：YAG是新型Q开关材料和近约外（NIR）可调谐激光晶体,作为新型Nd激光可饱和吸收体具有许多传统材料所没有的优点。本文概述了Cr^4 ：YAG的可饱和吸收特性,并介绍了Cr^4 ：YAG晶体生长的主要问题。     

YPO4:Dy3+,Eu3+荧光粉的水热合成及白光发射

采用水热法,合成了YPO₄:xDy³⁺,0.06Eu³⁺系列荧光粉。通过X射线衍射(XRD )、扫 描电子显微镜(SEM)、电子散射能谱(EDS)、光致发光(PL)谱和长余辉光谱,分别对样品的物 相、结构和PL进行了表征。 XRD检测表明,合成的样品属四方晶系;荧光光谱测试表明,在234nm紫外光激发下, YPO₄:xDy³⁺,0.06Eu³⁺的 发射光谱呈现Eu3+ 的⁵D₀→⁷F₁(592nm,橙光)和 ⁵D₀→ ⁷F₂(618nm,红光) 的发光峰;而在354nm的激发波长下,YPO₄:0.06Dy³⁺,0.06Eu³⁺的发射光谱 呈现Dy³⁺的4F9/2→⁶H15/2(486nm、蓝 光)和⁴F9/2→⁶H13/2(575nm、黄光)的发光 峰,以及Eu³⁺的⁵D₀→⁷F₁(592nm、 橙光)和⁵D₀→⁷F₂(619nm、红光 )的发光峰。对荧光 衰减谱的双参数拟合证实了Dy³⁺→Eu³⁺能量 传递的存在。色坐标图显示,在234nm紫外光激发下,YPO₄:0.05Dy ³⁺,0.06Eu3+ 是很好的近紫外光激发下的白色荧光粉。     

Er3+-Yb3+ and Er3+ doped fiberlasers

Single-mode fiber lasers operating at ~1.57 μm are described. Output powers of >2 mW are reported for laser diode pumped operation. Direct comparison is made between fiber lasers using sensitized erbium (Er³⁺ and Yb³⁺) and erbium on its own. The performance of Er³⁺-Yb³⁺ fiber lasers is analyzed in more detail as a function of fiber length. Both CW and Q-switched operations are studied and the results obtained demonstrate that practical sources at 1.5 μm are available from diode pumped Er³⁺ -Yb³⁺ systems     

Li_2分子A~1Σ_u~+→X~1Σ_g~+LIF和b~3Ⅱ_u→X~1Σ_g~+CIF发射光谱研究

用632.8nm CW激光获得了Li_2分子A~1∑_u~+(v′=15,J′=2)→X~1∑_g~+(v″=1～13,J″=1,3)R、P支双线LIF光谱。同时用光谱分析及碰撞动力学研究识别出另一支单线序列光谱来自b~3Ⅱ_u(v_b=21,N_b=1)→X~1∑_g~+(v″=3～6,J″=1)CIF发射。     

Na_2(b~3Σ_g~ )→Na_2(x~3Σ_u~ )发射光谱

用XeF激光的351毫米微来激励Na_2(x~1Σ_g~ )得到c~1Π_u→2~1Σ_g~ 跃迁范围内三条受激发射谱线及b~3Σ_g~ →x~3Σ_u~ 830毫微米至900毫微米准连续发射谱。文中讨论了这两个跃迁的关联并估计了产生激光振荡的可能性。     

Cr3+→Nd3+ energy transfer and Nd3+ laser action studies of La3Ga5SiO14:Cr3+,Nd3+ co-doped crystal

Energy transfer between Cr³⁺ and Nd³⁺ ions has been investigated in the 4.2-300-K temperature range by using steady-state and site-selective time-resolved laser spectroscopy. Radiative and nonradiative energy transfer has been studied from the time-resolved emission spectra and the donor fluorescence decays. The transfer efficiency was calculated as a function of temperature by using the Cr³⁺ lifetimes of the single doped and co-doped samples. Laser experiments were carried out in a diffusive cavity by pumping a co-doped rod 54 mm long and 5 mm in diameter with xenon flashlamps. The laser spectral emission shows a complex structure which varies as a function of pump energy. The temporal evolution of the laser spectrum is discussed in terms of a simple four-level spectral rate-equation laser model which takes into account the existence of two main broad Nd³⁺ site distributions with a large spectral overlap     

Infrared cross-section measurements for crystals doped withEr3+, Tm3+, and Ho3+

The absorption and emission cross sections of the transition between the ground spin-orbit multiplet and the lowest excited multiplet were measured for Er³⁺, Tm³⁺, and Ho³⁺ ions in a variety of crystalline hosts. The materials that were investigated include LiYF₄, BaY₂F₈, Y ₃Al₅O₁₂, LaF₃, KCaF₃ , YAlO₃, and La₂Be₂O₅. The absolute magnitudes of the emission cross sections were determined from the absorption spectra, with the aid of the principle of reciprocity. The calculated radiative emission lifetimes derived from these measured cross sections agree well with the measured emission decay times for most materials. The potential use of these rare-earth-doped materials in pulsed laser applications requires that the ground state exhibit adequate splitting to minimize the detrimental effects of the ground state thermal population, and also that the emission cross section be sufficiently large to permit efficient extraction energy. The systems based on Ho³⁺ in the eightfold coordinated sites of LiYF₄, BaY₂F₈, and Y₃Al₅O₁₂ appear to be the most promising