【摘要】：2μm激光在醫(yī)療手術(shù)、光電對(duì)抗、激光雷達(dá)等領(lǐng)域具有廣泛的應(yīng)用,其中,由2μm激光器作為光源的激光雷達(dá)是現(xiàn)階段研究熱點(diǎn)。2μm激光器作為激光雷達(dá)的光源,它的輸出功率穩(wěn)定性直接關(guān)系到激光雷達(dá)整體系統(tǒng)的性能優(yōu)劣。為了獲得激光輸出穩(wěn)定性更好的2μm激光器,本論文設(shè)計(jì)了雙角錐環(huán)形腔Ho:YAG激光器,并從基礎(chǔ)理論、腔型仿真和具體實(shí)驗(yàn)對(duì)其進(jìn)行詳細(xì)研究。理論上介紹了Ho:YAG激光晶體的物理特性和光譜特性;分析和計(jì)算了Ho:YAG的熱透鏡效應(yīng)和熱透鏡焦距;建立了Ho:YAG激光器速率方程;介紹了雙角錐環(huán)形腔Ho:YAG激光器的核心光學(xué)元件——角錐,通過(guò)模擬仿真分析它優(yōu)異的抗失諧特性,又從角錐的退偏特性入手,設(shè)計(jì)出偏振輸出的雙角錐環(huán)形腔腔型,對(duì)不同透鏡補(bǔ)償晶體熱效應(yīng)的腔型結(jié)構(gòu)進(jìn)行分析對(duì)比。再由理論基礎(chǔ)出發(fā),對(duì)不同腔長(zhǎng)的雙角錐環(huán)形腔Ho:YAG激光器進(jìn)行連續(xù)輸出實(shí)驗(yàn),再用凸透鏡補(bǔ)償熱效應(yīng)后的腔型條件下進(jìn)行連續(xù)輸出實(shí)驗(yàn),分析了補(bǔ)償后的激光器在輸出功率、斜效率、閾值、抗失調(diào)性等性能方面上的提升。最終在采用凸透鏡補(bǔ)償晶體熱效應(yīng)的腔型條件下,當(dāng)泵浦功率為31.6W時(shí),雙角錐環(huán)形腔Ho:YAG激光器最大激光輸出8.3W,斜效率為30.8%,輸出波長(zhǎng)為2090.8nm。再由此腔型連續(xù)出光條件下為基礎(chǔ),進(jìn)一步進(jìn)行雙角錐環(huán)形腔電光調(diào)Q輸出實(shí)驗(yàn),最終在重頻設(shè)置為6kHz、泵浦功率為29.81W時(shí),得到脈寬258ns、單脈沖能量1.142mJ、峰值功率4426.4W、波長(zhǎng)2090.8nm的脈沖激光輸出。
[Abstract]:2渭 m laser has been widely used in the fields of medical operation, photoelectric countermeasure, laser radar and so on. Among them, the laser radar with 2渭 m laser as the light source is the research hotspot at the present stage. The 2渭 m laser is used as the light source of the laser radar, and so on. Its output power stability is directly related to the performance of the overall lidar system. In order to obtain a 2 渭 m laser with better output stability, a double angle cone ring cavity Ho:YAG laser is designed and studied in detail from the basic theory, cavity simulation and concrete experiments. The physical and spectral properties of Ho:YAG laser crystal are introduced, the thermal lens effect and focal length of thermal lens of Ho:YAG are analyzed and calculated, and the rate equation of Ho:YAG laser is established. The core optical element of double-cone ring-cavity Ho:YAG laser-corner cone is introduced in this paper. Its excellent anti-detuning characteristic is analyzed by simulation and simulation. Based on the de-polarization characteristic of corner cone, the ring cavity configuration with polarization output is designed. The cavity structure of different lens compensation crystals with thermal effect is analyzed and compared. Based on the theory, the continuous output experiments of double-angle cone ring-cavity Ho:YAG laser with different cavity length are carried out, and then the continuous output experiment is carried out under the condition of compensating the thermal effect by convex lens. The enhancement of output power, slope efficiency, threshold value and anti-distortion performance of the compensated laser is analyzed. Finally, when the pump power is 31.6W, the maximum laser output is 8.3W, the slope efficiency is 30.8% and the output wavelength is 2090.8nm when the thermal effect of the crystal is compensated by convex lens. When the pump power is 31.6W, the maximum laser output is 8.3W, the slope efficiency is 30.8%, and the output wavelength is 2090.8nm. On the basis of the continuous output of the cavity, the experiment of double cone ring cavity Q-switched Q-switching is carried out. Finally, when the repetition frequency is set to 6kHz and the pump power is 29.81W, the pulse width is 258ns, the single pulse energy is 1.142mJ, the pulse width is 258ns, the single pulse energy is 1.142mJ, and the pulse width is 258ns. Peak power 4426.4W, pulse laser output of wavelength 2090.8nm.
【學(xué)位授予單位】：哈爾濱工業(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)】：TN248

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