| 1. | In section 3 , a new algorithm is given to simulate the propagation of focused beam
第三节阐述了在模拟计算聚焦光束时所给出的新算法。 |
| 2. | Anisotropy of beam wander of focused beam in atmospheric boundary layer above sea level
海面大气边界层中聚焦光束漂移各向异性的实验研究 |
| 3. | 2 . a new algorithm is derived to simulate the propagation of focused beam . 3
提出了模拟计算聚焦光束传输所用的新算法，突破了常规fft算法的不足； 3 |
| 4. | The results in two cases are connected inherently by fresnel number , which plays a key role in focused beam propagation
文中还利用fresnel数对两种传输过程的关系和聚焦光束的传输特性作了分析。 |
| 5. | An analogy to demonstrate this principle could be seen in the projection of a movie onto a screen by a high powered and focused beam of light coming from the projector
能够看见投影在银幕上的电影，以此类推，通过高原子能量和聚焦光束就产生了投射机。 |
| 6. | The traditional beam propagation algorithm based on fast fourier transform fails to give right results due to the limitation of the sampling theorem
由于取样定理的限制，常规的基于快速傅里叶变换( fft )光束传输模拟算法不能进行任意焦距聚焦光束的传输过程的模拟。 |
| 7. | For single lens , the change of beam quality lead to the varity of dimension and positions of spot of focused nd : yag laser . a telescopic system can produce constant dimension and position of beam waist
激光光束质量的变化导致了单透镜的聚焦光束的束腰大小和束腰位置都发生变化，采用望远镜耦合系统可以得到大小和位置都不变的像方束腰。 |
| 8. | A new algorithm is then derived , in which the factor of spherical wave front is removed explicitly . thus the propagation of a focused beam could be evaluated indirectly from propagation of an unfocused beam
文中对此作了分析，进而提出了一种新算法，将球面波因子提出，然后将会聚光束的传输过程转化为非会聚光束的传输过程，从而间接求得了聚焦光束的光场分布。 |
| 9. | In chapter 3 , by using theoretic analysis the focusing properties of an ideal annular beam is demonstrated . the intensity distribution near the focal point is given explicitly to show the influence of the ratio of inner to outer radius
第三章，从理想的环形光束出发，先在理论上分析了环形聚焦光束在焦点附近的光强分布情况和光束内外径之比(占空比)对聚焦性质的影响。 |
| 10. | The results show that radius and position of focal beam waist , focal angle and focal depth describe focal beam properties . they are determined by waist and rayleigh length of beam before focusing , the position and focal length of focus mirror
聚焦光束束腰位置和半径、聚焦角、焦深、焦点偏移量以及焦点漂移量是描述光束聚焦特性的主要参数,它们由四个参量共同决定,分别为聚焦前光束的束腰半径、瑞利长度和聚焦镜的焦距以及聚焦镜到光束束腰位置的距离。 |
