电致变色/电控荧光双功能聚合物的合成及性能

将电活性双胺单体4,4'-二氨基二苯醚与1,2,4,5-环己烷四甲酸二酐共聚, 得到电活性聚酰胺酸聚合物. 再通过后功能化方法, 采用酰胺化反应将2-氨基芴引入到聚合物结构中, 合成了荧光聚合物. 通过核磁、 红外和凝胶渗透色谱证实了聚合物的结构. 该聚合物在0~0.8 V的电压下展示出可逆的电化学活性. 在利用电压改变苯胺齐聚物链段的氧化状态的过程中, 聚合物薄膜发生了明显的颜色变化, 展现出良好的电致变色性质. 荧光性质随着施加电压的改变而变化, 展现出优异的电控荧光特性.     

脉冲激光二极管泵浦调Q激光器泵浦时间特性研究

从调Q激光器的速率方程出发,对脉冲激光二极管泵浦的调Q激光器在不同泵浦功率及不同透过率情况下的最佳泵浦时间进行了理论分析。计算结果表明,在透过率为20%,腔内损耗为0.05的条件下,1—3倍阈值泵浦功率时,最高效率对应的最佳泵浦时间为1—1.5倍Nd∶YAG荧光寿命;7倍阈值泵浦功率及以上时,最佳泵浦时间约为荧光寿命的一半或者更短。在脉冲泵浦能量相同时,采用较短的泵浦时间(即泵浦功率较高),调Q输出的能量转换效率较高。     

激光二极管端面抽运Nd:YVO4晶体连续输出板条激光器研究

报道了利用激光二极管列阵端面抽运Nd:YVO4混合腔板条激光器连续波输出的实验结果,获得近衍射极限的60 W连续激光输出.实验证明两种晶体输出功率相当,低掺杂浓度的Nd:YVO4晶体更有利于得到近衍射极限的高功率输出,但同时对冷却水温度的变化也较敏感.     

A Diode-Stack End-Pumped Electro-Optically Q-Switched Nd:YAG Slab Oscillator--Amplifier System

A laser diode-stack end-pumped electro-optically Q-switched Nd：YAG slab oscillator-amplifier system with neardiffraction-limited output is demonstrated by a stable-unstable hybrid resonator. The average power of 100 W at a repetition rate of lOkHz with a pulse width 14.7ns and average power of 76.3 W at a repetition rate of 5kHz with a pulse width of 10.2ns are measured. At the repetition rate of 10 kHz and at an output power of 89 W, the beam quality factors M^2 in the unstable and stable directions are 1.3 and 1.5, respectively.     

激光二极管端面泵浦多段复合板条激光器热效应

针对激光二极管端面泵浦的多段渐变浓度复合板条激光增益介质,提出了两种选取掺杂浓度的方法,并分别计算了多段渐变浓度复合板条增益介质的热量、温度及应力分布.结果表明,与单一掺杂浓度板条增益介质相比,采用多段渐变浓度复合增益介质可显著降低增益介质内部的温度梯度及最大热应力,从而提高了激光器整体的损伤极限泵浦功率,有利于激光器的功率升级.     

Laser-Diode End-Pumped Nd:YVO4 Slab Laser under Direct Pumping into the Emitting Level

We present an 880-nm laser-diode partially end-pumped Nd：YVO4 slab cw laser with output 126.7 W by using a hybrid resonator. The slop efficiency and optical-to-optical efficiency with respect to absorbed pumping power are 73.2% and 58.7%, respectively. At the output power of 100 W, the beam propagation M2 factors are 1.1 in the unstable direction and 1.15 in the stable direction.     

Laser Diode Pumped 1342nm Nd:YVO4 Slab Laser with a Compact Hybrid Resonator

An 880-nm laser-diode stack end-pumped cw 1342nm Nd：YVO4 slab laser with a compact positive confocal unstable-stable hybrid resonator is demonstrated. At absorbed pump power of 115 W, the output power 32.4 W is obtained. The slope efficiency and optical-to-optical conversion efficiency are 42% and 28.2%, respectively. At output power of 22 W, the stable direction M2 is 1.3 and the unstable direction M2 is 1.2.     

Diode-end-pumped 1D top-hat Nd：YVOa slab laser

A one-dimensional （1D） top-hat, diode-end-pumped, electro-optically Q-switched Nd：YVO4 slab laser is demonstrated. Under the pump power of 175.5 W, 26.3-W output power is obtained with the repetition rate of 5 kHz and the pulse width of 4.3 ns. The output beam has a good top-hat beam profile in both the near field and the far field.     

A Laser-Diode End-Pumped Nd:YVO4 Slab Laser at 1342nm

A laser-diode end-pumped Nd：YVO4 slab laser with a fiat-concave stable cavity at 1342nm is demonstrated. Under the pumping power of 92 W, a cw laser of output 17.8 W is obtained with the slope efficiency of 25.6%.     

一个二核钒配合物的合成及晶体结构：NH4[(VⅣO)2(μ2-O)(nta)2][EuⅢ(H2O)9](英)

A binuclear vanadium complex NH₄[(V^ⅣO)₂(μ₂-O)(nta)₂][Eu^Ⅲ(H₂O)₉] was synthesized by reaction of NH₃VO₃, nitrilotriacetic acid and EuCl₃ in one aqueous solution. The crystal X-ray analysis shows that the complex contains one binuclear vanadium anion [(V^ⅣO)₂(μ₂-O)(nta)2]^4- and one [Eu^Ⅲ(H₂O)₉]³⁺ cation. The molecules are built up to a three-dimensional supramolecular structure through hydrogen bonding. CCDC: 238716.