本文關(guān)鍵詞： 強激光 大氣傳輸 熱暈 材料 溫度場　出處：《西安電子科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：激光經(jīng)過差不多六十年的快速發(fā)展,如今在社會的各個領域都能見到它的身影。特別是隨著技術(shù)的革新,激光的功率越來越大,這也為激光應用開辟了新領域-激光武器。激光武器由于具有高精度、抗干擾能力強和機動性好等特點,各國都投入了大量的精力對其開展研究。本文主要圍繞強激光遠場輻射光學材料的溫度場展開,分析了強激光在大氣中傳輸?shù)臋C理,較為詳細的推導了由連續(xù)激光造成的穩(wěn)態(tài)熱暈效應的方程式以及由脈沖激光造成的瞬態(tài)熱暈效應的方程式;分析了強激光輻射光學材料的機理以及激光束在材料中的傳輸特點和受到的影響,研究了激光束進入光學材料后的吸收機制并推導出了相關(guān)的熱傳導公式;結(jié)合實際情況分別推導了直角坐標系和圓柱坐標系下高斯型激光束輻照射光學材料的三維溫度場;詳細推導了短脈沖激光、長脈沖激光以及連續(xù)激光遠場輻射光學材料溫度場的解。本文的主要工作如下:1.介紹了強激光在大氣中傳輸時產(chǎn)生熱暈效應的物理機理,從激光與大氣之間相互作用方程出發(fā),闡述了連續(xù)激光受到的穩(wěn)態(tài)熱暈效應以及脈沖激光受到的瞬態(tài)熱暈效應的特性和解析結(jié)果。并通過數(shù)值模擬分析了激光初始發(fā)射功率、激光在大氣中傳輸?shù)木嚯x、激光束腰半徑以及風速對穩(wěn)態(tài)熱暈效應的影響。對比分析了短脈沖激光和長脈沖激光受到的瞬態(tài)熱暈效應的區(qū)別。2.分析了激光輻射光學材料過程中,光學材料對入射光束的反射、透射和吸收物理機制。研究了強激光與光學材料兩者相互作用的物理機理,分析了本征吸收、自聚焦效應、多光子電離和電子崩、雜質(zhì)缺陷以及非線性吸收過程。研究了強激光輻射光學材料時,激光束在材料中引起的熱量轉(zhuǎn)移過程、運用麥克斯韋方程組,推導了直角坐標系下的熱傳導方程,并給出了圓柱坐標系下含內(nèi)熱源的熱傳導方程式。3.從熱傳導方程出發(fā),運用積分變換法,分別在直角坐標系和圓柱坐標系下,推導出強激光輻射光學材料的三維溫度場函數(shù)。采用解析方法分析了光學材料SiC溫度場分布,并與商業(yè)軟件COMSOL的有限元數(shù)值分析結(jié)果對比。4.基于高斯光束的瞬態(tài)熱暈效應,推導出長脈沖和短脈沖遠場輻射光學材料溫度場的解;針對有風時基模為連續(xù)高斯型激光束的穩(wěn)態(tài)熱暈效應,推導了連續(xù)激光遠場輻射光學材料溫度場的解,并詳細分析了連續(xù)激光發(fā)射功率、腰斑半徑、傳輸距離和風速對遠場光學材料K9玻璃溫升的影響。
[Abstract]:After nearly sixty years of rapid development, laser can be seen in every field of society, especially with the innovation of technology, the power of laser is getting bigger and bigger. This also opens up a new field for laser applications-laser weapons. Laser weapons are characterized by high accuracy, strong anti-jamming and good mobility. Many countries have devoted a great deal of effort to the research of it. This paper mainly focuses on the temperature field of optical materials irradiated by high intensity laser in the far field, and analyzes the mechanism of strong laser propagation in the atmosphere. The equation of steady state thermal halo effect caused by continuous laser and the equation of transient thermal halo effect caused by pulse laser are deduced in detail. The mechanism of intense laser radiation optical materials and the propagation characteristics of laser beams in the materials are analyzed. The absorption mechanism of laser beams entering the optical materials is studied and the relevant heat conduction formulas are derived. The three-dimensional temperature fields of Gao Si type laser beam irradiated optical materials in rectangular coordinate system and cylindrical coordinate system are derived respectively according to the actual situation, and the short pulse laser is deduced in detail. The main work of this paper is as follows: 1. This paper introduces the physical mechanism of the thermal halo effect when a strong laser propagates in the atmosphere, starting from the interaction equation between laser and atmosphere. The characteristics and analytical results of the steady state thermal halo effect of continuous laser and the transient thermal halo effect of pulse laser are described. The initial laser emission power and the distance of laser propagation in the atmosphere are analyzed by numerical simulation. The influence of laser waist radius and wind speed on the steady state thermal halo effect is analyzed. The difference between the transient thermal halo effect of short pulse laser and long pulse laser is compared. 2. The process of laser radiation optical material is analyzed. The physical mechanism of the interaction between intense laser and optical material is studied, and the intrinsic absorption, self-focusing effect, multiphoton ionization and electron avalanche are analyzed. Impurity defects and nonlinear absorption process. The heat transfer process caused by laser beam in the material is studied, and the heat conduction equation in the rectangular coordinate system is derived by using Maxwell's equations. The heat conduction equation with internal heat source in cylindrical coordinate system is given. Based on the heat conduction equation, the integral transformation method is used in the right angle coordinate system and the cylindrical coordinate system, respectively. The three-dimensional temperature field function of optical materials with intense laser radiation is derived. The temperature field distribution of optical material SiC is analyzed by analytical method, and compared with the results of finite element numerical analysis of commercial software COMSOL. 4. Based on the transient thermal halo effect of Gao Si beam, The solution of the temperature field of the long pulse and short pulse far-field radiation optical material is derived, and the solution of the temperature field of the far-field radiation optical material of continuous laser is deduced for the steady state thermal halo effect of the base mode of the continuous Gao Si laser beam in the wind-time. The effects of continuous laser power, waist radius, transmission distance and wind speed on the temperature rise of the far-field optical material K9 are analyzed in detail.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN24

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