laser beam focusing 中文意思是什麼
laser beam focusing
解釋
激光束聚焦-
On one hand, is the product of beam waist radius and half divergence angle, wavelength is not involved. so there is possibility to compare the acutal focusing ability among laser beams with different wavelength. on the other hand, is a calculated result by measuring experiment, and it is more brief and persuadable than m 2factor, since the latter one is a ratio with basic mode gauss beam
論文研究論證了用值評價激光光束質量的實際意義在於兩個方面，一方面它僅僅包含了光束束寬和發散角，不涉及波長的因素，使不同波長激光束的可加工能力具有可比性;另一方面，值是根據對光束傳輸路徑上不同位置處束寬實際測量結果的計算值，比其在與基模高斯光束進行比值計算得到的m2因子更簡潔、更有說服力。 -
4, single focuse the single head : is single for single laser head that panasonic lead off to adopt to focuse the double the laser beam for focusing ordering the project, he adopting the special whole synthesizing lens, passing lens in the center part ofly the focusing of formation cd the point, and pass the anastigmatic laser beam of part edge the formation the focusing of dvd the point, this kind of construction because of have no the machining to spread to move, and also can t produce the mechanical trouble, therefore increased to recognize the dish the speed, and however and also lowered the cost. but adoption this project of generation is with part of the next generation dvd nonsupports cdr
4單聚焦單鏡頭：為panasonic率先採用的單激光頭單聚焦鏡雙聚焦點方案，他採用特別的全息綜合透鏡，通過透鏡中間部分的激光束形成cd的聚焦點，通過透鏡邊緣部分的激光束形成dvd的聚焦點，這種結構由於沒有機械傳動，也不會產生機械故障，所以提高了認盤速度，不過同時也降低了成本。但採用此方案的第一代和部分第二代dvd不支持cdr 。 -
The propagation of ultrashort laser pulse in air is analyzed with mechanics analogy by considering kerr effects and free electron defocusing. the equation describing the evolution of the laser spot is derived. it is shown that long distance focusing requires large initial beam and the propagation distance is very sensitive to the initial divergence angle of the laser beam
考慮多光子電離效應和光學kerr效應，首次利用力學類比的方法研究了超短脈沖激光在電離氣體中的傳輸，詳細分析了傳輸距離與激光初始光斑、初始發散角以及激光功率的關系，提出了實現長距離傳輸的條件。 -
It is well known that nonlinear self - focusing effect is one of the important factors to limit icf laser energy and worsen beam quality
實踐表明，非線性自聚焦效應是限制icf驅動器激光輸出能量及破壞光束質量的主要因素之一。 -
Chapter 2 : characteristics of propagation of ultra - intense laser beam in a partially stripped preformed plasma channel is discussed, in which the relativistic self - focusing effects, together with the perturbed plasma density, is discussed
第二章：本章闡述了超強激光光束在拋物型部分電離的預等離子體（聚焦和散焦）隧道中的傳輸特性。研究了相對論自聚焦效應和等離子體波引起的密度擾動對傳輸的影響。 -
Based on this, a case of typical external self - focusing effect, hot - image, has been analytically and experimentally investigated in this dissertation. the principal work is as follows. ( 1 ) intense laser beam propagation equation, the paraxial wave equation, has been derived
論文的主要內容為如下幾部分： （ 1 ）從電磁波的基本傳播方程出發，推導了描述強激光在透明克爾介質中傳輸行為的非線性近軸波動方程。 -
Elemental analysis based on the emission from plasma generated by focusing a powerful laser beam on a solid sample surface is known as laser - induced breakdown spectroscopy ( libs ). when the power density of laser on the sample surface is high enough, the sample is vaporized, and the neutral and ionic species are formed in excited states
利用聚焦的強激光束入射固體靶表面產生激光等離子體，對等離子體中原子和離子發射譜進行雜質元素分析，這一過程叫做激光誘導擊穿譜（ laser - inducedbreakdownspectroscopy ） ，簡稱（ libs ） 。 -
Based on analyse of parameters which used to evaluate laser beam quality at present and according to the main properties which influence on laser manufacturing, beam focus characteristics parameter is put forward as the stander parameter to evaluate beam quality, because the foundmental advantage of laser beam applied in industral field is that laser beam can achieve high energy intensity through focusing
論文在總結目前存在的評價激光光束質量參數的基礎上，根據對影響激光製造的主要光束特性參數的分析，以光束空間特性為核心，提出用光束聚焦特徵參數值作為評價激光光束質量的參數。因為激光作為能源能夠在工業領域廣泛應用的根本優勢就在於它可以通過聚焦獲得極高的能量密度，而值恰恰表徵了實際光束的可聚焦能力。 -
So, it is clear that the beam quality and focusing system determine the focal beam properties together, k fand fnumber describe them separately. laser beam quality influences on beam
這四個參數分別反映了光束本身的特性和聚焦系統特性，光束特性用值描述，聚焦系統特性用焦數描述。 -
In high - power solid - state lasers, self - focusing is the major factor for degradation of laser beam and limits the maximum laser power available. as stated in lowrence livermore national laboratory ( llnl ) reports, self - focusing, especially small - scale self - focusing, has always been a significant problem in the total design, engineering development, and safe operation of fusion lasers
在用於慣性約束核聚變（ icf ）的高功率固體激光驅動器中，自聚焦是使光束質量變壞和限制輸出功率的主要因素，正如美國勞侖斯?利弗莫爾國家實驗室（ llnl ）的報告所述，自聚焦，特別是小尺度自聚焦，是聚變激光器總體設計、工程研製和安全運行的重要問題。 -
The servo system is responsible for the focusing and tracking of the laser beam on the cd
伺服系統負責激光束在光盤上的聚焦和軌道跟蹤。 -
The laser blood sampling is the latest idea. the idea is based on focusing laser beam to pierce the finger skin, and then we can get and analyze the blood sampling
激光採血是一種最新的采血方法，它是利用聚焦的激光束刺破人的手指皮膚，然後採集血樣，並進行血樣分析。 -
Since the emergence of laser, the transmission and the focusing of spatially completely coherent beam have been studied extensively
自從激光產生以來，人們對完全相干光束的傳輸及聚焦特性已經進行了廣泛的研究。
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