激光器

The principle of constant power drive is: PD converts the change of output light power of laser diode into the change of diode current, and the change of current is feed back to voltage-current converser which adjusts output current of driver to compensate the laser diode.

这样，当激光器的输出光功率衰减时，驱动器相应的增大输出电流；当激光器的输出光功率增强时，驱动器就相应减小输出电流。对许多激光器应用来说，最希望脉冲输出，因为脉冲输出只有极小的结发热。

The luminescence power of semiconductor laser diode is tested after the radiator element of laser diode is made and the drive circuit is designed. Then, chaos mathematic model is introduced to produce deterministic class stochastic signal and C langrage program, which is based on the hardware circuit design of MSP430, is designed and on-line debugged to implement the dynamic stimulation effect and avoid the body adaptability with the duty cycle of chaos sequence. The duty cycle is adjusted and controlled to accomplish the reinforcing and reducing in moxibustion. At last, Average power of laser diode is tested under the conditions of different duty cycles and the waveforms are collected by applying virtual instrument.

在半导体激光器散热装置的特别制作及工作驱动电路的设计基础上，完成半导体激光器发光功率的测试，然后引入混沌数学模型方法来产生确定性的类随机信号，在 MSP430 单片机硬件电路设计的基础上，应用单片机 C语言进行程序设计并在线调试，实现传统灸法的动态刺激效果，采用混沌序列占空比信号消除人体适应性，调整和控制输出占空比的改变以达到灸疗的补泻手法的实现，最后对不同控制占空比情况下激光器输出的平均功率进行测试，完成工作波形的采集。

Plate and λ/2 plate were placed inside the Nd∶YVO4KTP green laser cavity with angle 90°between their fast axis.The composite plate composed of HWP,QWP and KTP has the function of QWP.The composite plate with Nd∶YVO4 can effectively suppress the coupling of polarized modes,and multi-longitudinal-mode lownoise green laser was obtained.Since the composite plate counteracted the phase shift induced by temperature sensitivity of quartz plate,the green laser operated with lownoise reliability in different output power and different operation temperature.The threelongitudinalmode, the noise of less than 0.5% and output power stability of less then 1% for 12 hour are obtained in the green laser.

介绍了一种LD泵浦腔内倍频全固体Nd∶YVO4KTP多纵模、低噪音、高功率稳定绿激光器在Nd∶YVO4KTP绿激光器组成的谐振腔内放置厚度约相等的石英晶体λ2波片和λ4波片，使两波片快轴夹角互呈90°，HWP、QWP与KTP构成复合波片，其作用相当于QWP，此复合波法与各相异性Nd∶YVO4共同作用有效抑制了腔内偏振模耦合，获得多纵模低噪音绿光输出此复合波片相互作用由于抵消了石英晶体波片温度敏感引起的相位延迟量漂移，所以此激光器在不同功率、不同工作温度下，均能稳定可靠地运转于低噪音状态实验结果为，绿光输出纵模数为3个，噪音小于0.5%，12 h功率稳定性优小于1

High-frequency continuous modulation on the high-power semiconductor laser is required in our ladar system. The theory and driving methods of the semiconductor laser is summarized in this article. Two kinds of driving circuit including linear power amplifier and resonance power amplifier are designed for continuous and quasi continuous modulated laser.

针对研制的无扫描激光雷达系统，需要对大功率半导体激光器进行高频连续调制，本文总结了半导体激光器的原理和驱动方法，并针对连续和准连续调制大功率激光器的特点分别设计了两套驱动电路，包括线性功率放大驱动电路和谐振功率放大驱动电路。

The high efficiency and high power semiconductor laser with multi-active regions, which are integrated by reverse biased tunnel junctions can resolve the heat problems in theory and overcome these shortcomings. So study and improve the novel laser have a important significance.

通过反向偏置的隧道结将多个有源区级联起来的新型高效大功率半导体激光器很好的解决了传统激光器存在的问题，研制并改进这种新型激光器有着重要的意义。

In this thesis, Based on the advantages of diode-pumped solid-state laser in Chapter 1, the development of diode-pumped solid-state laser is introduced. The trends of DPSSL are pointed out, the wide application fields ,as well as the bright market future of high power DPSSL are also summarized. In the Chapter 2 , all kinds of solid-state laser gain materials are introduced in detail. In the Chapter 3 , the theory on the mode-matching of the pump beam and the cavity mode is analyzed in detail based on the basic theory and work principle of LD-pumped all-solid-state laser.

本论文第一章从二极管泵浦固体激光器的优势出发，介绍了二极管泵浦固体激光器的发展，指出了DPSSL的发展方向，概括介绍了大功率DPSSL的诸多应用领域和广阔的市场前景；第二章对固体激光增益材料作了详细的介绍；第三章基于LD泵浦固体激光器的基本理论和工作原理，从理论上详细分析了LD端面泵浦激光器中泵浦光与腔模的匹配问题。

For the case that there was no frequency detuning, the array was always in out-of-phase mode.

对于运行频率相等的两个光纤激光器，当两个光纤激光器初始相位差不为0时，相位锁定后的激光器阵列输出模式为异相模；对于运行频率不等的情形，给出了锁相运行对两个光纤激光器运行频率差的要求，并分析了降低这种要求的几种方法。

We believe that the improvement of the frequency response is due to a two-mode beat that includes the main mode of the slave laser and the master laser mode, which coincides with the side band of the slave laser.

激光器频率响应的改善可以用两个模式的拍频来解释，一个模式是从激光器的主模，另一个是主激光器的模式，该模式与从激光器的边带重合。

Beijing HuaYuan Star laser technology Co.,Ltd , a Chinese-American joint venture enterprise, a manufacturer which specially dedicates in Fiber assembly, packaging of fiber pigtailed semiconductor lasers, butterfly cases and butterfly packaging of high power laser diodes, and new high stable and maintenance-less fiber laser pumped by semiconductor laser diodes.

北京， 激光技术，华源，尾纤，激光器北京华源世达激光技术有限公司，是一家中美合资企业，专门致力于尾纤型激光器的生产和研发工作。主要生产尾纤型半导体激光器、碟形封装的高功率激光二极管和最新的高稳定性免维护的光纤激光器光源。

Based on the research of the Zeeman effect of 633 nm He-Ne laser, we have observed and measured the beat frequency tuning curve of 543nm He-Ne laser under different magnetic field orientations and intensities.

参照633nmHe－Ne激光器的塞曼效应，对543nm He－Ne激光器在不同方向和强度磁场下的拍频调谐特性进行了观测，发现在横向磁场作用下激光器的频差过低而且调谐曲线不规则，而纵向磁场下的调谐曲线较好，所以决定采用纵向塞曼激光器进行稳频。

If you are unfortunate enough to the lovelorn, please tell me, I will help you out, really, please contact me!

如果你不幸失恋了，请告诉我，我会帮助你摆脱困境，真的，请联系我啦！

China's plan to cut energy intensity by 20 percent and pollutant discharges by 10 percent between 2006 and 2010 is a case in point.

中国计划在2006年到2010间降低20%的能源强度和减少10%的主要污染物排放，就是一个这样的例子。