| 1. | Study of sol - ton tramsmission and coupling in heat - lens effect of photorefactive crystal
光折变晶体热透镜效应中光孤子传输与耦合特性的研究 |
| 2. | We analyze the positive and negative lens effect caused by the hole theoretically and give the expression of normalized transmittance in this condition
本文从理论上分析了因孔洞而产生的正透镜或负透镜效应并给出了归一化透过率的表达式。 |
| 3. | In the third chapter , the thermal lens effect of laser crystal is studied . the model of thermal lens theory and some measuring methods are explored . these methods are generalized and classified and the advantages and disadvantages of which are pointed out
第三章分析了激光晶体的热透镜效应，研究了热透镜理论模型和各种测量方法，对这些方法总结、归类并指出了各自的优缺点。 |
| 4. | According to this , the phase - matching conditions , effective nonlinear coefficients , acceptances of angle and wavelength for biaxial " crystals have been discussed in detail . thermal lens effect is an important factor which affects the quality of laser beam and the amount of output power
实验上，采用了双轴晶体lbo作为倍频晶体，因此对双轴晶体相位匹配、有效非线性系数的计算、允许角、允许波长给出了较完整的分析。 |
| 5. | The optimum position of focal spot of pumping laser through coupling system is calculated . in the fifth chapter , the optical characteristics of nd : yvo4 and lbo are studied . the astigmatism problem of resonant cavity is explored thoroughly under the condition of thermal lens effect
第五章分析了nd ： yvo _ 4和lbo晶体的光学特性，深入分析了在引入热透镜效应的情况下谐振腔的像散问题，设计了四镜z型折叠腔，应用abcd定律计算优化选择了一组腔参数。 |
| 6. | When the laser beam interacts with the plasma , the effect of plasma on laser beam welding is mainly embodied , for example : the reflection , the scatter , the absorption , and the heat lens effect of the plasma acting on the laser beam and so on
等离子体对激光焊接物理过程及其质量的影响主要体现在等离子体与激光束之间的一系列相互作用上，如：等离子体对入射激光的反射、散射，等离子体对入射激光的负透镜效应，等离子体对激光能量的吸收，等离子体的反冲力效应，等离子体热源效应等。 |
| 7. | Because of high threshold of 946 nm laser , severe thermal lens effect will appear when the 946 nm laser operations . in the consideration of thermal lens effect , the - optimized folding cavity has been devised . the relation between thermal lens effect and the radius of laser beam waist has been given as well
由于946nm激光阈值很高，需要更强的泵浦功率密度，因此较大功率蓝光激光器的热透镜效应将会比红光和绿光激光器更明显，而热透镜效应是影响激光功率提高和激光输出稳定性的重要原因，所以在考虑到激光晶体热透镜效应的情况下，优化设计了折叠腔结构，并给出了热透镜效应和折叠腔中腔模半径大小的关系。 |
| 8. | First , some principle that should be considered in building a laser cavity was discussed based on the rate equation of four - level laser model . then , the thermal lens effect of nd : yvo4 crystal was analyzed and estimated theoretically . the laser cavity was designed by considering the thermal lens effect and the optimal transmission was estimated
首先在理论上通过四能级激光器速率方程，讨论了激光器设计上需要注意的一些原则，然后分析了nd ： yvo _ 4晶体的热透镜效应，理论上估算了其热焦距的大小，并且在腔型设计中给予了考虑。 |
