【摘要】：2μm高重頻、窄脈寬脈沖激光可廣泛應用于激光雷達、遠程遙感等領(lǐng)域。電光腔倒空技術(shù)可以實現(xiàn)高重頻窄脈寬激光輸出,并且具有調(diào)制速度快,調(diào)制效率高等優(yōu)點。所以研究單摻銩固體激光器的電光腔倒空具有一定的實用價值。本論文主要從理論和實驗兩個方面對單摻銩固體激光器的電光腔倒空技術(shù)進行研究。理論部分,首先基于Tm3+的能級躍遷和能量傳遞過程,建立了常溫下單摻Tm3+連續(xù)運轉(zhuǎn)的激光速率方程,模擬分析了腔倒空光場建立階段諧振腔內(nèi)光子數(shù)和晶體上能級粒子數(shù)隨時間變化的趨勢以及倒空光場的產(chǎn)生。然后,分別討論了驅(qū)動器電信號的開關(guān)速度、諧振腔長度對脈沖的影響,以及腔倒空穩(wěn)定性與重頻的關(guān)系。在實驗部分,在考慮晶體熱透鏡的情況下,根據(jù)ABCD矩陣和穩(wěn)區(qū)條件,對諧振腔進行了設(shè)計,并完成了Tm:YAP晶體和Tm:Lu AG晶體的電光腔倒空實驗。對于Tm:YAP晶體,我們進行了電光腔倒空的長腔和短腔實驗。在短腔實驗中,泵浦光對RTP晶體的熱作用嚴重影響了脈沖穩(wěn)定性。為優(yōu)化實驗結(jié)果,進行了長腔腔倒空實驗,并最終獲得了平均功率為3.02 W,脈沖寬度為7.1 ns,輸出波長為1996.9 nm的相對穩(wěn)定的脈沖激光輸出。此時,高功率的泵浦光對電光晶體的調(diào)制作用依然產(chǎn)生了一定影響,從而導致脈沖前沿上翹。對于Tm:Lu AG晶體,同樣進行了電光腔倒空的長腔和短腔實驗。長腔實驗中,高壓時間確定的條件下,隨著重復頻率的降低,諧振腔逐漸變成了非穩(wěn)腔。為使諧振腔在低重復頻率下能保持穩(wěn)定,縮短腔長,最終獲得了穩(wěn)定的腔倒空脈沖激光輸出。其最大輸出功率為1.22 W,對應脈沖寬度為3.5 ns,輸出波長為2012.7 nm。
[Abstract]:2 渭 m high repetition frequency, narrow pulse width pulse laser can be widely used in laser radar, remote sensing and other fields. High repetition frequency and narrow pulse width laser output can be realized by electro-optic cavity emptying technology, and it has the advantages of high modulation speed and high modulation efficiency. So it has certain practical value to study the electro-optic cavity emptying of thulium-doped solid-state laser. In this paper, the electro-optic cavity emptying technology of thulium doped solid state laser is studied theoretically and experimentally. In the theoretical part, based on the energy level transition and energy transfer process of Tm3, the laser rate equation of Tm3 continuous operation at room temperature is established. The variation trend of photon number and the number of upper level particles in the cavity with time and the generation of the inverted light field during the establishment of the cavity inverted light field are simulated and analyzed. Then, the effects of the switch speed, the length of the resonator on the pulse, and the relationship between the cavity emptying stability and the repetition rate are discussed respectively. In the experimental part, the resonator is designed according to the ABCD matrix and the condition of stable region, and the electro-optic cavity emptying experiment of Tm:YAP crystal and Tm:Lu AG crystal is completed under the consideration of the crystal thermal lens. For Tm:YAP crystal, long and short cavity experiments of electro-optic cavity emptying have been carried out. In short cavity experiment, the thermal effect of pump light on RTP crystal seriously affects the pulse stability. In order to optimize the experimental results, a relatively stable laser output with an average power of 3.02 W and a pulse width of 7.1 ns, with a wavelength of 1996.9 nm was obtained. At this time, the modulation of the electro-optic crystal is still affected by the high power pump light, which leads to the upwarping of the pulse front. For Tm:Lu AG crystal, the experiments of long and short cavities with electro-optic cavity emptying are also carried out. In the long cavity experiment, the resonator becomes unstable with the decrease of repetition rate under the condition of high voltage time. In order to keep the resonator stable at low repetition rate and shorten the cavity length, a stable cavity inverted pulse laser output is obtained. The maximum output power is 1. 22 W and the corresponding pulse width is 3. 5 ns,. The output wavelength is 2012.7 nm..
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248.1

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本文編號：2362213