發(fā)布時(shí)間：2018-06-18 06:33

  本文選題：矩形光束 + 光束整形��； 參考：《中國(guó)科學(xué)院研究生院（光電技術(shù)研究所）》2015年碩士論文

【摘要】：近年來,通過不斷研究,板條激光器正一步一步在高功率、高光束質(zhì)量的道路上發(fā)展前進(jìn),然而板條激光器的幾何對(duì)稱結(jié)構(gòu)和Zigzag光路設(shè)計(jì)雖然在理論上有望解固體激光器的熱退偏,熱致聚焦等熱效應(yīng)問題,但實(shí)驗(yàn)結(jié)果卻遠(yuǎn)遠(yuǎn)沒有達(dá)到理論的預(yù)期。多模輸出、失調(diào)、動(dòng)態(tài)畸變、泵浦增益不均勻等因素共同導(dǎo)致了板條激光器輸出無論是輸出功率還是光束質(zhì)量都沒有達(dá)到理論計(jì)算的結(jié)果。此外。板條激光器輸出的是具有大長(zhǎng)寬比的矩形光束,其非軸對(duì)稱光強(qiáng)分布限制了這一類激光器的應(yīng)用。其輸出光束帶有輸出光束帶有離焦與像散的波前畸變,其長(zhǎng)方向與窄方向光束發(fā)散角不同,造成了聚焦光斑彌散、遠(yuǎn)場(chǎng)能量集中度降低,從而引起光束質(zhì)量下降。為解決以上問題,本文設(shè)計(jì)了一套針對(duì)板條激光器出射光束的光學(xué)整形擴(kuò)束系統(tǒng),并對(duì)其做了仿真分析與實(shí)驗(yàn)驗(yàn)證�？紤]到板條激光器輸出光束是矩形光束,對(duì)其輸出光束長(zhǎng)方向與窄方向進(jìn)行了能量分布分析后得到其窄方向光束能量分布為類高斯分布,長(zhǎng)方向光束能量分布為超高斯-平頂分布,由此在Zemax中對(duì)板條激光器輸出光束進(jìn)行了仿真模擬,為后續(xù)優(yōu)化整形擴(kuò)束系統(tǒng)奠定基礎(chǔ)。對(duì)幾種典型的光束整形方法其各自優(yōu)勢(shì)與缺點(diǎn)做出了對(duì)比分析,綜合考慮后提出利用柱面透鏡與球面透鏡作為元件設(shè)計(jì)整形擴(kuò)束系統(tǒng)的思路。本文設(shè)計(jì)的整形擴(kuò)束系統(tǒng)對(duì)入射光束寬度與發(fā)散角具有一定的動(dòng)態(tài)范圍,是一種介于針對(duì)單一參數(shù)設(shè)計(jì)的被動(dòng)整形補(bǔ)償系統(tǒng)與主動(dòng)光學(xué)整形系統(tǒng)之間的半自動(dòng)光學(xué)整形系統(tǒng)。對(duì)于需要加自適應(yīng)光學(xué)系統(tǒng)進(jìn)行進(jìn)一步光束凈化的實(shí)驗(yàn)來說,板條激光器出射的矩形光束經(jīng)過本課題設(shè)計(jì)的光束整形擴(kuò)束系統(tǒng)后的出射光束為方形光束,增大了光束在波前校正器上的有效覆蓋范圍,有利于后續(xù)AO系統(tǒng)對(duì)其波前畸變的校正補(bǔ)償,釋放變形鏡的行程,減小了波前校正器對(duì)剩余波前畸變補(bǔ)償校正的壓力。本文利用矩陣光學(xué)光學(xué)傳輸矩陣?yán)碚撨M(jìn)行光學(xué)整形擴(kuò)束系統(tǒng)的初始結(jié)構(gòu)參數(shù)的計(jì)算,并對(duì)初始結(jié)構(gòu)進(jìn)行優(yōu)化。對(duì)優(yōu)化后的光束整形系統(tǒng)做了仿真分析及驗(yàn)證實(shí)驗(yàn)。仿真及實(shí)驗(yàn)表明,本課題設(shè)計(jì)的光束整形系統(tǒng)可以將1.5mm×15mm的矩形光束整形擴(kuò)束為尺寸在15mm×15mm至20mm×20mm范圍內(nèi)變化的方形準(zhǔn)直光束,并且能夠較好地達(dá)到光束整形與像差補(bǔ)償?shù)男Ч０鍡l激光器出射的光束經(jīng)過整形系統(tǒng)后,其光束波前像差有較大的改善,遠(yuǎn)場(chǎng)能量集中度大大增加。
[Abstract]:In recent years, through continuous research, slab lasers are developing step by step on the road of high power and high beam quality. However, the geometric symmetry structure of slab laser and the design of Zigzag optical path are expected to solve the thermal effects such as thermal depolarization and thermal focusing of solid-state lasers in theory, but the experimental results are far from the theoretical expectation. The multi-mode output, misalignment, dynamic distortion and uneven pump gain result in the output power and beam quality of the slab laser are not up to the theoretical calculation results. In addition. The slab laser outputs a rectangular beam with a large aspect ratio, and its non-axisymmetric intensity distribution limits the application of this kind of laser. The output beam has defocus and astigmatic wavefront distortion, and its long and narrow beam divergence angles are different, resulting in the dispersion of focusing spot and the decrease of far-field energy concentration, which leads to the decline of beam quality. In order to solve the above problems, an optical beam shaping and expanding system for slab laser is designed, and its simulation analysis and experimental verification are done. Considering that the output beam of slab laser is a rectangular beam, the energy distribution in the long and narrow direction of the output beam is analyzed, and the energy distribution of the beam in the narrow direction is similar to that of Gao Si. The energy distribution of the long beam is ultra high and flat top, so the output beam of the slab laser is simulated in Zemax, which lays a foundation for the subsequent optimization of the shaping and expanding system. The advantages and disadvantages of several typical beam shaping methods are compared and analyzed, and the idea of designing beam shaping and expanding system using cylindrical lens and spherical lens as components is put forward. The shaping and expanding system designed in this paper has a certain dynamic range for the width and divergence angle of the incident beam. It is a semi-automatic optical shaping system between the passive shaping compensation system designed for a single parameter and the active optical shaping system. For experiments that require further beam purification with adaptive optical systems, the rectangular beam emitted by the slab laser is a square beam after the beam shaping and expanding system designed in this paper. The effective coverage of the beam on the wavefront corrector is increased, which is beneficial to the compensation of the wavefront distortion in the follow-up AO system, the release of the travel of the deformable mirror, and the reduction of the pressure of the wavefront corrector to compensate the residual wavefront distortion. In this paper, the initial structure parameters of optical shaping and beam expanding system are calculated by using matrix optical transfer matrix theory, and the initial structure is optimized. The optimized beam shaping system is simulated and verified. The simulation and experiments show that the beam shaping system designed in this paper can transform the rectangular beam of 1.5mm 脳 15mm into a square collimated beam whose size varies from 15mm 脳 15mm to 20mm 脳 20mm, and can better achieve the effect of beam shaping and aberration compensation. After the beam from slab laser passes through the shaping system, the wavefront aberration of the beam is greatly improved, and the far-field energy concentration is greatly increased.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院（光電技術(shù)研究所）
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN248.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 陳懷新,隋展,陳禎培,安波,李明中;采用液晶空間光調(diào)制器進(jìn)行激光光束的空間整形[J];光學(xué)學(xué)報(bào);2001年09期

2 竇任生,林海,胡繼承;控制液晶器件產(chǎn)生的程控透鏡和微透鏡陣列[J];光學(xué)學(xué)報(bào);2005年07期

3 呂百達(dá),蔡邦維,張彬;強(qiáng)激光的空間整形和靶面均勻輻照技術(shù)[J];紅外與激光工程;1999年01期

4 龔華平,呂志偉,林殿陽;激光束空間整形的研究現(xiàn)狀[J];激光與光電子學(xué)進(jìn)展;2005年09期

5 李晉閩;;高平均功率全固態(tài)激光器發(fā)展現(xiàn)狀、趨勢(shì)及應(yīng)用[J];激光與光電子學(xué)進(jìn)展;2008年07期

6 陳林;賀少勃;劉建國(guó);劉勇;陳遠(yuǎn)斌;景峰;;新一代百千瓦高平均功率板條激光器研究進(jìn)展[J];激光與光電子學(xué)進(jìn)展;2009年01期

7 周壽桓;趙鴻;唐小軍;;高平均功率全固態(tài)激光器[J];中國(guó)激光;2009年07期

8 靳強(qiáng),魏曉羽,高健存,吳念樂;連續(xù)16W二極管端面泵浦混合腔Nd:YVO_4板條激光器[J];量子電子學(xué)報(bào);2005年04期

9 蔡震,楊成龍,楊森林,姚震宇;板條側(cè)面絕熱技術(shù)研究[J];強(qiáng)激光與粒子束;2002年04期

相關(guān)博士學(xué)位論文 前2條

1 李霄;板條激光放大器相干合成技術(shù)研究[D];國(guó)防科學(xué)技術(shù)大學(xué);2011年

2 雷翔;板條固體激光器光束凈化控制技術(shù)研究[D];中國(guó)科學(xué)院研究生院（光電技術(shù)研究所）;2013年

相關(guān)碩士學(xué)位論文 前1條

1 陳月健;高功率二極管端泵浦板條激光放大特性研究[D];電子科技大學(xué);2013年

，

本文編號(hào)：2034534