Efficient continuous-wave eye-safe region signal output from intra-cavity singly resonant optical parametric oscillator

We report an efficient continuous-wave (CW) tunable intra-cavity singly resonant optical parametric oscillator based on the multi-period periodically poled lithium niobate and using a laser diode (LD) end-pumped CW 1064 nm Nd:YVO 4 laser as the pump source.A highly efficiency CW operation is realized through a careful cavity design for mode matching and thermal stability.The signal tuning range is 1401-1500 nm obtained by varying the domain period.The maximum output power of 2.2 W at 1500 nm is obtained with a 17.1 W 808 nm LD power and the corresponding conversion efficiency is 12.9%.     

固体激光腔动力学稳定性的调控

在固体激光腔运行中热透镜的屈光度,1ft,作为谐振腔的动力学因子,对腔的运行特性有着关键性的影响作用.运用变换圆图解方法,对固体激光腔的光模特性的动力学稳定性作了详细的分析,给出了它对动力学因子及腔参数u1=L1(L1-R1)R1与u2=L2(L2-R2)R2的依赖关系.给出了腔参数u1与u2的直观物理图像描述;在此基础上,利用变换圆图解方法,进一步讨论,如何选择腔参数u1与u2,调节稳定区内运行的最小基模光斑尺寸和动力学稳定区的宽度,及调控动力学稳定区的‘位置’;提出了两倍拓宽动力学稳定区的一个可行方案;最后,还讨论了动力学敏感腔的存在及其在自调Q激光器与自Kerr透镜锁模激光器中的可能运用. 关键词： 固体激光器 热透镜 动力学稳定性的调控     

Efficient stable simultaneous CW dual-wavelength diode-end-pumped Nd:YAG laser operating at 1.319 and 1.338 μm

Efficient, simple, and compact laser sources of simulta-neous emissions at multiple wavelengths have shown lotsof application foregrounds in many fields, such as opti-cal communication, photodynamic therapy (PDT), opti-cal calculation, military interaction, environmental mon-itory, laser remote sensing, laser radar, spectroanalysis,medical instrumentation, and scientific research on non-linear optical mixers[1]. In addition, it can also be usedas a pump source of Terahertz-wave generated by n…     

激光二极管抽运共轴双晶体黄光激光器

提出一种全新的单抽运源、共轴双晶体实现黄光激光的方法,并对其进行了理论分析和实验研究.利用该方法在抽运功率为1.5 W时,获得了54 mW的黄光激光输出,激光不稳定度为5%,光-光转换率为3.6%,而利用对1064 nm损耗的方法在相同条件下只获得15 mW的黄光输出. 该方法结构简单、灵活多样,可以应用到很多弱增益谱线与强增益谱线和频的结构当中,实现诸如491,488,593.5,555和500.8 nm的激光输出. 关键词： 黄光激光器 单抽运源 双晶体 和频     

104 W内腔倍频全固态Nd:YAG绿光激光器

报道了一台高功率内腔倍频全固态Nd:YAG绿光激光器,针对KTP晶体热效应和激光热稳定腔,采取了对KTP晶体进行低温冷却的优化措施,以便减少KTP晶体的热效应导致的相位失配,同时兼顾了Nd:YAG棒的热致双折射效应和KTP晶体热透镜效应,设计了热稳定谐振腔;实验中采用80个20 W激光二极管阵列侧面抽运Nd:YAG棒和Ⅱ类相位匹配KTP晶体(在27℃时相位匹配角为φ=23.6°;θ=90°,尺寸为7 mm×7 mm×10 mm)内腔倍频技术,谐振腔腔长为530 mm,KTP晶体的冷却温度为4.3 ℃,抽运电流为18.3 A时,实现平均功率达104 W、脉冲宽度为130 ns的532 nm激光输出;其重复频率为20.7 kHz.光-光转换效率为10.2%.     

Laser Diode Pumped 1.54μm Er：Yb：Phosphate Glass Continuous Wave Compact Laser

We report a cw Er^3 :Yb^3 co-doped phosphate glass laser pumped by a laser diode. The maximum output power of 78.3mW and a slope efficiency of 15.25% were achieved. The laser spectral region was from 1532nm to 1535nm, with the peak laser wavelength at 1534nm. The laser modes and time stabillty were also measured.The thermal effect had little influence on the output in our experiment.     

1.54μm Er3+, Yb3+共掺玻璃激光器的速率方程及数值分析

LD抽运共掺Er,Yb玻璃激光器中的跃迁过程较复杂,针对双掺离子之间的能量传递和Er3 +的多种跃迁过程,给出了详细的准三能级系统的速率方程,在合理简化后进行了数值分析,分析了Er3+掺杂浓度和介质长度、抽运光斑、输出镜透过率、谐振腔长、抽运光的椭圆度等因素对激光阈值及斜率效率的影响.     

碳纳米管基杂化涂层的自组装构筑及对棉织物阻燃性能的影响

采用层层自组装技术在棉织物表面构筑了聚六亚甲基胍磷酸盐(PHMGP)/聚磷酸铵(APP)/PHMGP/海藻酸钾(PA)-碳纳米管(CNT)四分子层构成的有机-无机杂化膜,赋予了棉织物良好的防火性能.傅里叶变换红外光谱和紫外-可见光谱的结果表明,自组装涂层在棉织物上近似呈现线性生长.绝缘电测量显示,由于在纤维上形成了致密的CNT导电网络结构,棉织物经10层自组装涂层处理后电阻率大幅度下降,从1.8×1010Ω·cm降低到9.1×104Ω·cm,导电性能有了较大幅度的改善.所有织物样品的热性能和燃烧测试结果均表明,该自组装涂层赋予了棉织物良好的阻燃性能.随着涂层层数的增加,残炭量大幅度增加,燃烧时间逐渐减少,燃烧后的余焰现象消失,同时织物仍然保持完整的结构.残炭的扫描电镜和傅里叶变换红外光谱的结果证实,棉织物上的阻燃增强效应归因于膨胀阻燃涂层与CNT物理阻隔层的协同热屏障作用.     

5.3-W Nd:YVO_4 passively mode-locked laser by a novel semiconductor saturable absorber mirror

We report a diode end-pumped continuous wave (CW) passively mode-locked Nd:YVO4 laser with a homemade semiconductor saturable absorber mirror (SESAM). The maximum average output power is 5.3 W at the incident pump power of 17 W, which corresponds to an optical-optical conversion efficiency of 31.2% and slope efficiency of 34.7%. The corresponding optical spectrum has a 0.2-nm full width at half maximum (FWHM). and the pulse repetition rate is 83 MHz.     

LD端抽运平直腔Nd:YVO4固态激光器的输出功率特性研究

对LD端抽运平直腔Nd:YVO4固态激光器输出功率特性受激光器内在诸因素(热透镜效应、腔长、激活孔径等)的制约关系进行了研究.并用传播圆-变换圆图解分析方法给出了合理的解释,同时,对进一步提高其输出功率特性指出了方向.