本文選題：激光薄膜 + 激光損傷��； 參考：《西安工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著科學(xué)技術(shù)的不斷發(fā)展,光學(xué)系統(tǒng)的應(yīng)用領(lǐng)域越來(lái)越廣泛,光學(xué)薄膜作為光學(xué)系統(tǒng)中的核心組成部分越來(lái)越受到重視,其主要作用是調(diào)控光束傳輸質(zhì)量,保護(hù)系統(tǒng)以免發(fā)生損壞。然而在強(qiáng)激光作用下,光學(xué)系統(tǒng)中的薄膜不可避免會(huì)發(fā)生損傷,一旦損傷發(fā)生將會(huì)影響整個(gè)系統(tǒng)的功能。衡量薄膜穩(wěn)定性最重要的參數(shù)就是薄膜的抗激光損傷閾值,而激光對(duì)薄膜損傷主要是以等離子體沖擊波的形式造成的,因此研究等離子體沖擊波的特征就具有重要意義。本文在理論研究基礎(chǔ)上,選購(gòu)了一套等離子體沖擊波采集和處理設(shè)備,搭建了實(shí)驗(yàn)平臺(tái),分別對(duì)等離子體沖擊波在空氣中的傳播規(guī)律、衰減規(guī)律、頻域特征以及其與激光輻照能量之間的關(guān)系進(jìn)行了實(shí)驗(yàn)分析,并最終得到了以等離子體沖擊波強(qiáng)度特征為判別依據(jù)的薄膜損傷閾值測(cè)試方法。將傳聲器置于沖擊波場(chǎng)中的不同位置,以相同條件多次輻照薄膜樣片,可以得到?jīng)_擊波在不同位置的特征規(guī)律;改變傳聲器與輻照點(diǎn)距離,測(cè)得激光器輸出脈沖時(shí)間與等離子體沖擊波傳播到傳聲器的時(shí)間,可以得到等離子體沖擊波在固定距離下的傳播馬赫數(shù);改變激光脈沖能量,在固定的位置采集等離子體沖擊波信號(hào),分析信號(hào)的強(qiáng)度與頻域信息,可以得到二者與激光輻照能量間的關(guān)系;根據(jù)激光輻照能量與等離子體沖擊波強(qiáng)度關(guān)系,結(jié)合薄膜損傷情況,可以得到以等離子體沖擊波為特征的薄膜損傷判別方法。實(shí)驗(yàn)表明:等離子沖擊波在空氣中以近似球面的形式傳播,其傳播馬赫數(shù)會(huì)迅速衰減,當(dāng)?shù)竭_(dá)厘米量級(jí)時(shí),速度便已衰減為聲速;等離子體沖擊波的頻率會(huì)隨著激光輻照能量的增加而降低,而其強(qiáng)度會(huì)隨著激光輻照能量的增加而增大;根據(jù)薄膜的激光損傷閾值與沖擊波強(qiáng)度和激光能量的關(guān)系式中,可以計(jì)算出以等離子體沖擊波強(qiáng)度為特征的薄膜損傷判別標(biāo)準(zhǔn),經(jīng)實(shí)驗(yàn)驗(yàn)證,該方法準(zhǔn)確度高,識(shí)別快速,具有很好的應(yīng)用前景。
[Abstract]:With the development of science and technology, the application of optical system is more and more extensive. Optical thin film, as the core component of optical system, is paid more and more attention to, and its main role is to control the quality of beam propagation. Protect the system from damage. However, the thin film in the optical system will inevitably be damaged under the strong laser irradiation. Once the damage occurs, the function of the whole system will be affected. The most important parameter to measure the stability of the film is the threshold of laser damage, which is mainly caused by plasma shock wave, so it is of great significance to study the characteristics of plasma shock wave. On the basis of theoretical research, a set of equipment for the acquisition and treatment of plasma shock wave has been selected, and an experimental platform has been set up to study the propagation and attenuation of the plasma shock wave in the air, respectively. The characteristics in frequency domain and the relationship between them and the energy of laser irradiation are analyzed experimentally. Finally, the damage threshold testing method based on the characteristics of plasma shock wave intensity is obtained. When the microphone is placed in different positions in the shock wave field and the film sample is irradiated with the same conditions many times, the characteristic law of the shock wave at different positions can be obtained, and the distance between the microphone and the irradiation point can be changed. By measuring the laser output pulse time and the time when the plasma shock wave propagates to the microphone, the Mach number of the plasma shock wave propagating at a fixed distance can be obtained, and the laser pulse energy can be changed. The relationship between the intensity and frequency domain information of the plasma shock wave signal and the laser irradiation energy can be obtained according to the relationship between the laser irradiation energy and the plasma shock wave intensity, and the relationship between the laser irradiation energy and the plasma shock wave intensity can be obtained by collecting the plasma shock wave signal at a fixed position. Considering the damage of the film, a method for judging the damage of the film, which is characterized by the plasma shock wave, can be obtained. The experimental results show that the plasma shock wave propagates in the form of an approximate sphere in the air, and its Mach number will decay rapidly, and when it reaches the centimeter level, the velocity has been reduced to the velocity of sound. The frequency of plasma shock wave will decrease with the increase of laser irradiation energy, and its intensity will increase with the increase of laser irradiation energy, according to the relation between laser damage threshold and shock wave intensity and laser energy, The damage criterion of film characterized by the intensity of plasma shock wave can be calculated. The experimental results show that the method is accurate, rapid and has a good prospect of application.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O484

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