LD泵浦全固態(tài)Yb:YAG陶瓷激光器研究
發(fā)布時(shí)間：2018-12-25 09:06
【摘要】：近紅外波段的激光在科研、工業(yè)加工、軍事以及醫(yī)學(xué)等領(lǐng)域都有著巨大的應(yīng)用潛力,全固態(tài)激光器更因?yàn)槠淞己玫姆�(wěn)定性、緊湊的結(jié)構(gòu)等優(yōu)勢備受人們關(guān)注,一直都是人們探索研究的重點(diǎn)。激光透明陶瓷的誕生,具備著很多晶體卓越的性能,所以陶瓷激光器成為近些年眾多科學(xué)家研究的熱點(diǎn),為固體激光材料向大尺寸以及多功能發(fā)展開拓了全新的領(lǐng)域。基于以上的研究背景,本論文研究了國產(chǎn)的各種規(guī)格Yb:YAG激光透明陶瓷的激光性質(zhì),并在本文中做了詳細(xì)的報(bào)道,本論文的工作主要包括以下幾個方面:一、使用中心波長在970 nm的LD作為泵浦源,研究了通光截面積為5 mm*5 mm,通光長度為3 mm和6 mm,Yb3+摻雜濃度為別1 at.%、2 at.%、5 at.%、10 at.%、15 at.%、20 at.%的國產(chǎn)Yb:YAG透明陶瓷的連續(xù)激光輸出以及波長連續(xù)調(diào)諧性質(zhì)。利用通光長度為3 mm、摻雜濃度為15at.%的Yb:YAG透明陶瓷,當(dāng)吸收泵浦功率為6.3 W時(shí),在透射率為10%的耦合輸出鏡下得到了2.4 W的連續(xù)激光輸出,其斜效率為47%;利用通光長度為6 mm、摻雜濃度為10 at.%的Yb:YAG透明陶瓷,當(dāng)吸收泵浦功率為6.6 W時(shí),在透射率為10%的耦合輸出鏡下得到了2 W的連續(xù)激光輸出,其斜效率為41%。然后在諧振腔的輸出端插入三棱鏡實(shí)現(xiàn)波長連續(xù)調(diào)諧輸出,利用通光長度為3mm、摻雜濃度為15 at.%Yb:YAG透明陶瓷,吸收7W的泵浦功率時(shí),在透射率為0.8%的耦合輸出鏡下波長連續(xù)調(diào)諧的范圍1017-1096 nm;利用通光長度為6 mm、摻雜濃度為10 at.%Yb:YAG透明陶瓷,在7 W的泵浦功率時(shí),在透射率為0.8%的耦合輸出鏡下波長連續(xù)調(diào)諧的范圍1034-1096 nm。第二、利用Lab VIEW軟件編程校正激光誘導(dǎo)擊穿光譜(LIBS)技術(shù)測量的光譜背景噪聲。在本實(shí)驗(yàn)中利用調(diào)Q脈沖固體激光器,脈寬為10 ns,輸出的中心波長為1064 nm,可以輸出的最大激光能量為150 m J,然后對輸出的1064 nm的脈沖激光經(jīng)過三倍頻至355 nm,然后聚焦到樣品表面,最后利用光譜儀采集LIBS光譜。但是因?yàn)長IBS光譜中存在較強(qiáng)連續(xù)背景光,在此工作中,我們根據(jù)LIBS技術(shù)所測得的光譜數(shù)據(jù)的特點(diǎn),先找到所測得的全光譜范圍內(nèi)的所有極小值,然后利用一個合適的閾值,去除這些極小值中不合理的極小值,最后利用一項(xiàng)或者多項(xiàng)多項(xiàng)式來擬合這些剩余的極小點(diǎn),最后用擬合的曲線近似代替全光譜范圍的連續(xù)背光進(jìn)行光譜校正。之后利用Lab VIEW對此算法進(jìn)行編程,使得該程序可以實(shí)現(xiàn)自動估算校正激光誘導(dǎo)擊穿光譜技術(shù)所測得的光譜數(shù)據(jù)中的連續(xù)背光,得到更為合理的光譜圖,最終實(shí)現(xiàn)不用過多的人為干預(yù),便可以靈活的根據(jù)所得測的光譜,校正光譜中的連續(xù)背光,得到更為合理的光譜圖。該方法不僅適用于LIBS技術(shù)光譜的連續(xù)背光的校正,同樣適用于其它類型光譜的連續(xù)背光校正。
[Abstract]:Near-infrared lasers have great application potential in scientific research, industrial processing, military and medical fields. All solid-state lasers have attracted much attention because of their good stability and compact structure. It has always been the focus of people's exploration and research. The emergence of laser transparent ceramics has a lot of excellent crystal properties, so ceramic lasers have become a hot spot of many scientists in recent years, which has opened up a new field for the development of solid-state laser materials to large size and multi-function. Based on the above research background, the laser properties of various kinds of Yb:YAG laser transparent ceramics made in China have been studied in this paper, and detailed reports have been made in this paper. The work of this thesis mainly includes the following aspects: 1. Using LD with a central wavelength of 970 nm as the pump source, the optical cross section area of 5 mm*5 mm, and the doped concentration of 6 mm,Yb3 with 3 mm were studied. Continuous laser output and wavelength tunable properties of 20 at.% Yb:YAG transparent ceramics. Using the transparent Yb:YAG ceramics doped with 3 mm, at a concentration of 15at.%, the CW laser output of 2.4W is obtained under the coupling output mirror of 10% transmittance when the absorption pump power is 6.3W. Its oblique efficiency is 47. Using transparent Yb:YAG ceramics doped with 6 mm, in length and 10 at.% in concentration, when the pump power is 6.6 W, the continuous laser output of 2 W is obtained under the coupling output mirror with 10% transmittance, and the oblique efficiency is 41%. Then a prism is inserted into the output end of the resonator to realize the continuous wavelength tuning output. When the pass length is 3mm and the doping concentration is 15 at.%Yb:YAG transparent ceramics, the pump power of 7W is absorbed. Wavelength continuous tuning range 1017-1096 nm; under a coupled-output mirror with a transmittance of 0.8% Using transparent ceramics doped with 6 mm, in length and 10 at.%Yb:YAG at 7 W pump power, the wavelength tuning range of 1034-1096 nm. under a coupling output mirror with a transmittance of 0.8% is obtained. Secondly, the spectral background noise measured by laser induced breakdown spectroscopy (LIBS) is corrected by Lab VIEW software. In this experiment, Q-switched pulsed solid-state laser is used. The center wavelength of 10 ns, pulse width output is 1064 nm, and the maximum energy is 150mJ. Then, the output pulse laser of 1064 nm passes through three times frequency to 355 nm,. Then focus on the surface of the sample, and finally collect the LIBS spectrum by spectrometer. But because there is a strong continuous background light in the LIBS spectrum, in this work, according to the characteristics of the spectral data measured by the LIBS technique, we first find all the minimum values in the whole spectral range, and then use an appropriate threshold. The unreasonable minimum of these minimums is removed, and the residual minimum points are fitted by one term or polynomial, and the spectral correction is carried out by using the fitted curve approximation instead of the continuous backlight in the whole spectral range. After that, the algorithm is programmed by Lab VIEW, which can automatically estimate and correct the continuous backlight in the spectral data measured by laser induced breakdown spectroscopy, and get more reasonable spectra. Finally, without too much human intervention, we can flexibly correct the continuous backlight in the spectrum according to the measured spectrum, and get a more reasonable spectral map. This method is not only suitable for the correction of the continuous backlight in the LIBS spectrum, but also for the continuous backlight correction of other kinds of spectra.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248
本文編號：2390973
[Abstract]:Near-infrared lasers have great application potential in scientific research, industrial processing, military and medical fields. All solid-state lasers have attracted much attention because of their good stability and compact structure. It has always been the focus of people's exploration and research. The emergence of laser transparent ceramics has a lot of excellent crystal properties, so ceramic lasers have become a hot spot of many scientists in recent years, which has opened up a new field for the development of solid-state laser materials to large size and multi-function. Based on the above research background, the laser properties of various kinds of Yb:YAG laser transparent ceramics made in China have been studied in this paper, and detailed reports have been made in this paper. The work of this thesis mainly includes the following aspects: 1. Using LD with a central wavelength of 970 nm as the pump source, the optical cross section area of 5 mm*5 mm, and the doped concentration of 6 mm,Yb3 with 3 mm were studied. Continuous laser output and wavelength tunable properties of 20 at.% Yb:YAG transparent ceramics. Using the transparent Yb:YAG ceramics doped with 3 mm, at a concentration of 15at.%, the CW laser output of 2.4W is obtained under the coupling output mirror of 10% transmittance when the absorption pump power is 6.3W. Its oblique efficiency is 47. Using transparent Yb:YAG ceramics doped with 6 mm, in length and 10 at.% in concentration, when the pump power is 6.6 W, the continuous laser output of 2 W is obtained under the coupling output mirror with 10% transmittance, and the oblique efficiency is 41%. Then a prism is inserted into the output end of the resonator to realize the continuous wavelength tuning output. When the pass length is 3mm and the doping concentration is 15 at.%Yb:YAG transparent ceramics, the pump power of 7W is absorbed. Wavelength continuous tuning range 1017-1096 nm; under a coupled-output mirror with a transmittance of 0.8% Using transparent ceramics doped with 6 mm, in length and 10 at.%Yb:YAG at 7 W pump power, the wavelength tuning range of 1034-1096 nm. under a coupling output mirror with a transmittance of 0.8% is obtained. Secondly, the spectral background noise measured by laser induced breakdown spectroscopy (LIBS) is corrected by Lab VIEW software. In this experiment, Q-switched pulsed solid-state laser is used. The center wavelength of 10 ns, pulse width output is 1064 nm, and the maximum energy is 150mJ. Then, the output pulse laser of 1064 nm passes through three times frequency to 355 nm,. Then focus on the surface of the sample, and finally collect the LIBS spectrum by spectrometer. But because there is a strong continuous background light in the LIBS spectrum, in this work, according to the characteristics of the spectral data measured by the LIBS technique, we first find all the minimum values in the whole spectral range, and then use an appropriate threshold. The unreasonable minimum of these minimums is removed, and the residual minimum points are fitted by one term or polynomial, and the spectral correction is carried out by using the fitted curve approximation instead of the continuous backlight in the whole spectral range. After that, the algorithm is programmed by Lab VIEW, which can automatically estimate and correct the continuous backlight in the spectral data measured by laser induced breakdown spectroscopy, and get more reasonable spectra. Finally, without too much human intervention, we can flexibly correct the continuous backlight in the spectrum according to the measured spectrum, and get a more reasonable spectral map. This method is not only suitable for the correction of the continuous backlight in the LIBS spectrum, but also for the continuous backlight correction of other kinds of spectra.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248
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