【摘要】：2.1μm波段激光器在激光醫(yī)療、激光雷達(dá)、光電對抗等領(lǐng)域都有著廣泛的應(yīng)用,線寬窄化、功率提高是應(yīng)用需求驅(qū)使下2.1μm激光器極為重要的發(fā)展方向,具有廣闊的發(fā)展前景�；贛gO:PPLN準(zhǔn)相位匹配技術(shù)的光參量振蕩器是獲得2.1μm激光的有效方法,但該方法受變頻簡并點(diǎn)、泵浦光線寬和強(qiáng)抽運(yùn)下的高增益等影響,輸出的2.1μm激光線寬較寬,針對這一問題,本論文開展了相關(guān)理論和實驗研究。理論方面研究了MgO:PPLN晶體調(diào)諧特性,基于MgO:PPLN的2.1μm單諧振光參量振蕩器增益、閾值及轉(zhuǎn)換效率,優(yōu)化設(shè)計了1.064μm高重頻泵浦源及光參量振蕩器器件參數(shù)。分析了造成2.1μm激光中心波長漂移及線寬展寬的原因,理論計算了2.1μm激光線寬展寬量,并且在此基礎(chǔ)上,在保證光譜選擇性的前提下,研究了體布拉格光柵器件不同光柵厚度d,光柵的空間頻率f和折率調(diào)制量δn等參數(shù)對線寬窄化的影響。實驗方面MgO:PPLN晶體溫度固定在50.5°C,采用折疊型外腔泵浦結(jié)構(gòu),1064nm泵浦功率為12.9W條件下,自由運(yùn)轉(zhuǎn)時實現(xiàn)了5.51W的簡并波長2.1μm激光輸出,光譜線寬為109nm,引入VBG光柵器件,獲得2.904W窄線寬2.1μm激光輸出,線寬被有效壓窄至0.17 nm,光-光轉(zhuǎn)換效率達(dá)到22.5%。
[Abstract]:2.1 渭 m band lasers have been widely used in the fields of laser medical treatment, lidar, optoelectronic countermeasure and so on. Line width narrowing and power increasing are the most important development directions of 2.1 渭 m laser driven by application demand. It has broad prospects for development. The optical parametric oscillator based on MgO:PPLN quasi-phase matching technique is an effective method to obtain 2.1 渭 m laser. However, this method is affected by the degenerate point of frequency conversion, the width of pumping light and the high gain of strong pump, and the output line width of 2.1 渭 m laser is wider. To solve this problem, this paper carried out theoretical and experimental research. Theoretically, the tuning characteristics of MgO:PPLN crystal are studied. Based on the gain, threshold and conversion efficiency of MgO:PPLN 2.1 渭 m single resonance optical parametric oscillator, the device parameters of 1.064 渭 m high repetition frequency pump source and optical parametric oscillator are optimized. The causes of the center wavelength shift and linewidth broadening of 2.1 渭 m laser are analyzed, and the linewidth broadening amount of 2.1 渭 m laser is calculated theoretically. On the basis of this, the spectral selectivity is guaranteed. The effects of parameters such as space frequency f and fold rate modulation 未 _ n on the width of the grating are studied with different grating thickness of bulk Bragg grating device. The experimental results show that the temperature of MgO:PPLN crystal is fixed at 50.5 擄C, the structure of folded external cavity is adopted, the pump power of 1064nm is 12.9 W, the degenerate wavelength of 5.51 W is 2.1 渭 m, the spectral linewidth is 109 nm, and the output wavelength of 5.51 W is 2.1 渭 m when the pump power of 1064nm is 12.9 W. The VBG grating device is introduced and the 2.904W narrow linewidth 2.1 渭 m laser output is obtained. The linewidth is effectively compressed to 0.17 nm, and the optical-optical conversion efficiency is 22.5%.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN753.91

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