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.     

非对称平直腔固体激光器的动力学分析

利用传播圆图解方法，分析了非对称平直腔固体激光器的热透镜效应对激光器的动力学稳定区的宽度、基模光斑尺寸和发散角的影响。此方法避免了传统ABCD矩阵法所需的繁琐计算，结果清晰明了，进而给出了测量晶体热焦距的一个简单方法。在该理论的指导下，设计了符合试验条件的谐振腔参量，并进行了实验研究，测量了激光二极管端面抽运的Nd：YVO4激光器的热焦距和光斑模式，当抽运功率23W时获得了稳定的10W准基模连续输出，实验结果与理论符合得很好。     

LD抽运Nd:YVO4晶体中的上转换及其影响

对激光二极管抽运下Nd:YVO₄晶体中的上转换发光做了测量与分析,发现对应⁴G_7/2能级向下跃迁的上转换发光的主导机制为能量传递上转换.接着,对上转换对LD抽运Nd:YVO₄激光器运转的影响进行了理论分析,并特别讨论了上转换对热效应的影响. 关键词： 上转换 固体激光器 热效应     

高功率端面抽运Nd:YVO4固体激光器模匹配的研究

研究了端面抽运Ｎｄ：ＹＶＯ４固体激光器激光晶体内基模半径与抽运光斑半径的匹配。晶体的Ｎｄ掺杂原子数分数分别为０．５％和２％,抽运功率分别为１０Ｗ和１４Ｗ。结果表明：ＴＥＭ００模输出功率对ｗ１／ｗｐａ在低于１的很大范围内的变化不敏感,不存在一个确定的最佳ｗ１／ｗｐａ值;在相对很小的ｗ１／ｗｐａ情形,仍可获得高效单一的ＴＥＭ００模输出,在这种情况下热透镜球差具有限模孔径的作用。     

激光二极管端面抽运的1.34μm Nd:YVO4平凹腔型激光器

理论上分析了端面抽运的1.34μm Nd:YVO₄平凹腔型激光器的各项参数；实验 上实现了LD端面抽运的1.34μm Nd:YVO₄平凹腔型激光器的运转. 关键词： 固体激光 4晶体')" href="#">Nd:YVO₄晶体 平凹腔     

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. 关键词： 激光二极管端面抽运 板条激光器 混合腔     

LD泵浦Nd:YVO4双波长运转腔内和频491 nm激光器

分析了Nd:YVO4激光器实现双波长运转及腔内和频的条件,利用一种LD泵浦Nd:YVO4晶体产生1 064 nm和914 nm双波长激光束,采用一个线性平凹腔结构,利用腔内Ⅰ类临界相位匹配LBO和频,获得了连续波输出的全固态激光器。实验采用端面结构,在5.0 W的808 nm泵浦功率下,获得了最高功率为2.5 mW连续波TEM00的激光输出,光-光转换效率为0.05%。     

LD端面泵浦折叠腔Nd∶YVO4/LBO激光器

对端面泵浦Nd∶ YVO4构成的四镜Z型折叠腔结构进行了理论研究,合理调整谐振腔的参量关系,使谐振腔能够适应不同泵浦功率下激光晶体热焦距的变化,同时所设计的折叠腔还具有腔参量调整灵活等特点.以LBO晶体为倍频晶体,采用Ⅰ类角度调节位相匹配技术,在双端泵浦光功率为26 W时,成功地获得了4 W稳定的连续绿光输出.Nd∶ YVO4/LBO绿光激光器输出为4 W时的稳定性为1.3%,其光-光转换效率达到13%.     

激光二极管抽运Nd：YVO4／LBO红光激光器研究

报道了激光二极管抽运的Nd：YVO4晶体、LBO晶体Ⅱ类非临界相位匹配腔内倍频大功率红光激光器。通过对激光晶体热效应的考虑,设计了热不灵魂腔,采用低掺杂浓度Nd：YVO4晶体,获得了671nm红光的最高输出为890mW。     

LD抽运Nd:LuVO4微片激光器性能研究

报道了一类新型的LD端面抽运Nd：LuVO₄微片激光器，讨论了在不同掺杂浓度，不同厚度和不同透过率下的激光性质，测定了在不同抽运功率下，微片最佳激光输出功率与LD抽运温度的关系.在2W抽运功率下获得923mW的1064nm激光输出，阈值为48mW，斜效率为52%.对微片制冷后斜效率提高到59%. 关键词： LD抽运 微片激光器 4')" href="#">Nd：LuVO₄     

Measurement of Thermal Lens Focal Length and Its Effect on Laser Output Characteristics in LD End-pumped Nd:YVO4 Lasers

According to the resonator transform circle theory, the focal length of thermal lens of laser media in laser diode end-pumped solid-state lasers is analyzed and measured with a simple method. A 30W 808nm LD pumped YVO4 laser is developed and characterized.     

Measurement of Thermal Lens Focal Length and Its Effect on Laser Output Characteristics in LD End-pumped Nd∶YVO4 Lasers

According to the resonator transform circle theory, the focal length of thermal lens of laser media in laser diode end-pumped solid-state lasers is analyzed and measured with a simple method. A 30W 808nm LD pumped YVO4 laser is developed and characterized.     

Continuous-wave diode-laser end-pumped Nd:YVO4/KTP high-power solid-state green laser

A simple folded-cavity used for intracavity frequency-doubled Nd:YVO₄ laser was analyzed by transmission matrix and numerical calculation. We have selected a set of proper cavity parameters which can be used readily by operating at high power levels with low threshold, high efficiency, and wide dynamic operating range. 5.6-W TEM₀₀ green laser has been obtained at a 22-W pumping power and with an optical–optical conversion efficiency of 25.5%.     

LD端面泵浦矩形Nd:YVO_4晶体的热效应研究

建立了矩形激光晶体的热传导模型。通过充分考虑晶体侧面与冷却液之间的对流传热,以及晶体端面与外界的热传导,建立了更为合理的边界条件。利用有限元差分法求解泊松方程,得到激光晶体内温度和温度场分布。研究结果表明,在考虑晶体的侧面对流和端面导热的情况下,得出了更符合实际的晶体温度场分布,计算的热焦距与实验测量结果更为吻合。     

激光二极管端面抽运的高效率1.34μm Nd:YVO4 平凹腔型激光器

理论方面分析了端面抽运的1.34mm Nd:YVO4平凹腔型激光器的各项参数；文中的分析可为同类激光器的设计提供参考。实验方面实现了LD端面抽运的1.34mm Nd:YVO4平凹腔型激光器的运转；在输入泵浦功率为9.0W时，获得了1.34mm 激光输出功率3.51W，光－光转换效率为39.0%。     

Single output LD end-pumped passively mode-locked Nd:YVO4 laser with semiconductor saturable absorber mirror

A quarter-wave plate and the thin film polarizer(TFP) are used for the LD end-pumped passively mode-locked Nd:YVO4 laser with semiconductor saturable absorber mirror(SESAM) to obtain a single beam output with a total power of 4.8 W.An optical-optical efficiency is achieved to be 24% for a stable CW mode-locking operation at 1064 nm,with a pulse repetition rate of 70 MHz and pulse width of 16 ps.The multipulse in the pulse sequence is eliminated for reaching a peak power as high as 4 kW.     

Thermal effects of the diode end-pumped Nd:YVO4 slab

The thermal effects of the diode end-pumped Nd:YVO₄ slab laser crystal are investigated both analytically and numerically. The theoretical model is established with considering the divergence of the pump beam in the slab. A detailed theoretical analysis of the temperature, stress and the focal length of thermal lens are presented. Using 3D finite element analysis, an accurate numerical solution based on the theoretical model is achieved. Our analysis includes the thermal fracture damage of the thermally and optically anisotropic slab and the predicated values are compared with the experimental results.     

Investigation of LD end-pumped Nd:YVO4 crystals with various doping levels and lengths

The absorption properties of Nd:YVO₄ crystals with various doping levels and lengths are reported. The effective stimulated emission cross-sections of different doping levels are calculated with measured upper-level lifetimes. Our investigation gives good advice on the optimization of LD end-pumped Nd:YVO₄ laser.