【摘要】：激光二極管(LD)抽運(yùn)的銩摻雜(Tm~(3+))固體激光器(DPSSL)是獲得2μm波段的激光的重要途徑,其在眾多領(lǐng)域均已顯示出不可或缺的應(yīng)用需求。本論文從理論和實(shí)驗(yàn)兩個(gè)方面對(duì)脈沖LD間歇抽運(yùn)Tm:YAG 2μm聲光調(diào)Q激光器進(jìn)行了研究。主要研究?jī)?nèi)容為:理論上,基于Tm~(3+)能級(jí)躍遷情況,對(duì)脈沖抽運(yùn)單摻Tm~(3+)調(diào)Q激光器速率方程進(jìn)行建立與求解,從理論上計(jì)算激光器輸出特性;使用Comsol軟件對(duì)Tm:YAG晶體內(nèi)部熱場(chǎng)分布進(jìn)行模擬;利用積分變換求解瞬態(tài)熱傳導(dǎo)方程,并利用Matlab軟件模擬Tm:YAG晶體熱透鏡焦距;在考慮熱焦距情況下設(shè)計(jì)兩種間歇抽運(yùn)諧振腔,為實(shí)驗(yàn)的開(kāi)展提供理論依據(jù)。實(shí)驗(yàn)上,首先開(kāi)展了脈沖LD抽運(yùn)Tm:YAG熱焦距測(cè)量實(shí)驗(yàn),單端抽運(yùn)100Hz注入能量14.5-130.2mJ,熱焦距由768mm降至269mm;200Hz注入能量14.5-160mJ,熱焦距由968mm降至124mm。雙端抽運(yùn)100Hz注入能量14.5-130.2mJ,熱焦距由535mm降至126mm;200Hz注入能量14.5-160mJ,熱焦距由450mm降至75mm。其次開(kāi)展脈沖LD間歇抽運(yùn)單塊雙端鍵合Tm:YAG聲光調(diào)Q激光器實(shí)驗(yàn)研究。調(diào)Q 200Hz時(shí),泵浦118mJ,輸出5.41mJ,斜率效率12.79%,脈寬395.4ns,波長(zhǎng)2013.94nm,光束質(zhì)量在x方向1.49,y方向1.59;再次開(kāi)展脈沖LD間歇抽運(yùn)單端鍵合Tm:YAG雙棒串接聲光調(diào)Q激光器實(shí)驗(yàn)。單塊晶體重頻100Hz,調(diào)Q 200Hz時(shí),泵浦176mJ,輸出6.04mJ,斜率效率13.06%,脈寬377.9ns,波長(zhǎng)2014.22nm,光束質(zhì)量在x方向1.29,在y方向1.45。結(jié)果證明間歇抽運(yùn)技術(shù)有提高輸出能量并使重頻成倍增長(zhǎng)的作用。最后,改變重頻條件、泵浦方式進(jìn)行對(duì)比試驗(yàn)。結(jié)果表明,間歇抽運(yùn)下的激光器運(yùn)轉(zhuǎn)重頻是與激光工作物質(zhì)的上能級(jí)壽命密切相關(guān)的。
[Abstract]:Laser diode (LD) pumped thulium doped (Tm~ (3) solid-state laser (DPSSL) is an important way to obtain 2 渭 m-band laser. It has shown an indispensable application demand in many fields. In this paper, a pulsed LD intermittently pumped Tm:YAG 2 渭 m acousto-optic Q-switched laser is studied theoretically and experimentally. The main research contents are as follows: theoretically, based on the transition of Tm~ (3) level, the rate equation of pulse pumped single-doped Tm~ (3) Q-switched laser is established and solved, and the output characteristics of the laser are calculated theoretically. The thermal field distribution in Tm:YAG crystal is simulated by Comsol software, the transient heat conduction equation is solved by integral transformation, and the focal length of Tm:YAG crystal thermal lens is simulated by Matlab software. Considering the thermal focal length, two kinds of intermittently pumped resonators are designed, which provide the theoretical basis for the development of the experiment. In the experiment, the measurement experiment of thermal focal length of pulsed LD pumped Tm:YAG was carried out. The single-end pumped 100Hz injection energy was 14.5 渭 130.2mJ, the thermal focal length was decreased from 768mm to 269mm and 200Hz injection energy 14.5x160mJ, and the thermal focal length was decreased from 968mm to 124mm. the thermal focal length was reduced from 968mm to 124mm. The injection energy of two-end pumped 100Hz is 14.5 脳 130.2mJ, the thermal focal length is reduced from 535mm to 126mm / 200Hz injection energy 14.5x160mJ, and the thermal focal length is reduced from 450mm to 75mm. Secondly, an experimental study of pulsed LD intermittently pumped acousto-optic Q-switched Tm:YAG laser with single-block and two-end bonding is carried out. When Q-switched 200Hz is used, the pump is 118mJ, the output is 5.41mJ, the slope efficiency is 12.79%, the pulse width is 395.4 ns, the wavelength is 2013.94 nm, the beam quality is 1.49 in x direction and 1.59 in y direction. The experiment of pulsed LD intermittent pumping single-end bonded Tm:YAG double rod series-connected acousto-optic Q-switched laser is carried out again. Single crystal repetition frequency 100Hz, Q-switched 200Hz pumped 176 MJ, output 6.04 MJ, slope efficiency 13.06%, pulse width 377.9 ns, wavelength 2014.22 nm, beam quality in x direction 1.29, y direction 1.45. The results show that the intermittent pumping technique can increase the output energy and double the repetition frequency. Finally, the pump mode is compared by changing the condition of repetition frequency. The results show that the re-operation frequency of the laser under intermittent pumping is closely related to the upper-level lifetime of the laser material.
【學(xué)位授予單位】：長(zhǎng)春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN248

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