【摘要】：2μm波段激光位于人眼安全范圍,可以應(yīng)用于人口密集的區(qū)域進行大范圍使用。2μm波段在大氣中損耗較小,大氣透過性能較好,經(jīng)常應(yīng)用于光電對抗,激光雷達,醫(yī)療,測距等方面。同時,2μm波段激光還可以作為泵浦源泵浦固體中紅外光學(xué)參量振蕩器,可以獲得3-12μm范圍內(nèi)的激光輸出。因此獲得良好的2μm激光輸出是具有實際的應(yīng)用意義的。為了進行了雙端泵浦的棒狀Ho:YAG激光器的實驗研究,我們基于Ho:YAG晶體的吸收光譜確定了Ho:YAG激光器的泵浦波長,由Ho:YAG晶體的發(fā)射光譜確定了Ho:YAG激光器的輸出波長范圍。由于泵浦光對晶體的相互作用會在晶體內(nèi)部形成熱致折射率梯度,因此我們從理論上計算分析了晶體內(nèi)部的溫度分布以及由折射率變化引起的熱透鏡的熱焦距�；谝陨侠碚摰挠嬎�,進行了雙端泵浦的棒狀Ho:YAG激光器的實驗研究。使用不同透過率的透鏡作為輸出鏡,實驗研究了不同的調(diào)Q方式,對于激光器輸出特性的影響。首先進行了主動電光調(diào)Q,在重復(fù)頻率為1k Hz的情況下,獲得了最高的單脈沖能量為17.3m J,脈沖寬度為16.9ns,峰值功率為1.024MW的脈沖輸出,屬于2μm波段效果較好的輸出結(jié)果。接下來進行了以Cr2+:Zn S為可飽和吸收體的被動調(diào)Q實驗,最后進行了主被動雙調(diào)Q實驗,并通過對比三種不同的調(diào)Q方式所得到的實驗結(jié)果,研究了雙調(diào)Q方式對于脈沖輸出激光在脈沖脈寬,峰值功率,輸出脈沖波形等方面的影響,通過雙調(diào)Q將脈寬大幅度壓縮,得到的脈沖波形近乎完全對稱。
[Abstract]:The 2渭 m-band laser is located in the safe range of human eyes and can be used in a wide range in densely populated areas. 2渭 m-band has a small loss in the atmosphere, good atmospheric permeability, and is often used in optoelectronic countermeasure, lidar, medical treatment, etc. Ranging, etc. At the same time, the 2 渭 m band laser can also be used as a pump source pumped solid-state infrared optical parametric oscillator, and the laser output in the range of 3-12 渭 m can be obtained. Therefore, it is of practical significance to obtain a good 2 渭 m laser output. In order to study the double-end pumped rod-like Ho:YAG laser, we determined the pumping wavelength of the Ho:YAG laser based on the absorption spectra of the Ho:YAG crystal. The output wavelength range of Ho:YAG laser is determined from the emission spectrum of Ho:YAG crystal. Because the interaction of pump light on the crystal will form the thermal refractive index gradient in the crystal, the temperature distribution in the crystal and the thermal focal length of the thermal lens caused by the change of refractive index are calculated and analyzed theoretically. Based on the above-mentioned theoretical calculations, the experimental study of a rod-like Ho:YAG laser with double-end pump is carried out. Using lenses with different transmittance as output mirrors, the effects of different Q-switching modes on the output characteristics of laser are studied experimentally. At first, the active electro-optic Q-switching is carried out. The maximum pulse energy is 17.3J, the pulse width is 16.9ns and the peak power is 1.024MW when the repetition rate is 1k Hz, and the maximum pulse energy is 17.3J, the pulse width is 16.9ns and the peak power is 1.024MW. It belongs to the better output result of 2 渭 m band. Then, the passive Q-switching experiment with Cr2: Zn S as saturable absorber is carried out. Finally, the active-passive double Q-switching experiment is carried out, and the experimental results obtained by three different Q-switching methods are compared. The influence of double Q-switching mode on pulse width, peak power and output pulse waveform of pulse output laser is studied. The pulse width is compressed by double Q-switching, and the pulse waveform is almost completely symmetrical.
【學(xué)位授予單位】：哈爾濱工業(yè)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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本文編號：2459565