【摘要】：2μm波段人眼安全激光處于大氣窗口,廣泛應(yīng)用于激光醫(yī)療、環(huán)境監(jiān)測和光通信等領(lǐng)域。此外,2μm激光器可作為3~5μm和8~12μm中紅外光參量振蕩器和光參量放大器的抽運(yùn)源。摻Ho3+晶體是產(chǎn)生高性能2μm激光的首選工作物質(zhì),而1.9μm Tm:YLF激光器是其理想泵浦源。因此,獲得高功率、高效率且高穩(wěn)定性的1.9μm激光輸出至關(guān)重要。本論文以理論模擬為基礎(chǔ),以體光柵為諧振腔鏡,結(jié)合腔內(nèi)雙F-P標(biāo)準(zhǔn)具,在保證高功率和高穩(wěn)定性的基礎(chǔ)上獲得窄線寬激光輸出。理論方面,介紹了Tm:YLF晶體的物理、光譜特性,基于Tm:YLF激光器準(zhǔn)三能級速率方程模型,通過簡化方程組最終得到激光器閾值、輸出功率及斜率效率的表達(dá)式,模擬并分析了上轉(zhuǎn)換效應(yīng)、交叉弛豫、以及晶體摻雜濃度和長度對Tm:YLF激光器輸出特性的影響,為后續(xù)激光器的設(shè)計(jì)與實(shí)驗(yàn)奠定理論基礎(chǔ)。設(shè)計(jì)方面,基于Tm:YLF晶體熱模型,對晶體溫度場分布進(jìn)行解析推導(dǎo)并模擬各參數(shù)晶體熱分布,綜合分析后選取晶體尺寸為3×3×12mm3,摻雜濃度為3.5at.%;對“L型”諧振腔不同參數(shù)條件下模式匹配、穩(wěn)定性進(jìn)行模擬,設(shè)計(jì)出諧振腔的參數(shù)范圍,為后續(xù)實(shí)驗(yàn)研究奠定基礎(chǔ);對窄線寬元件體光柵和F-P標(biāo)準(zhǔn)具進(jìn)行參數(shù)設(shè)計(jì),選取體光柵端面尺寸為6×6mm2,厚度為5.5±1.5nm,雙F-P標(biāo)準(zhǔn)具厚度分別為0.1mm和1mm。實(shí)驗(yàn)方面,搭建LD端面泵浦Tm:YLF激光器,并依次研究以體光柵為腔鏡時不同諧振腔長、輸出鏡透過率和曲率半徑對激光輸出特性的影響,確定最佳諧振腔參數(shù),并在腔內(nèi)插入雙F-P標(biāo)準(zhǔn)具,實(shí)現(xiàn)了17.8W的1908.55nm穩(wěn)定性較高的激光輸出,線寬僅為0.10nm,且波長最大波動范圍僅0.34nm。激光器相應(yīng)的斜率效率和光光轉(zhuǎn)換效率分別為42.89%和35.86%。
[Abstract]:The 2 渭 m band human eye safe laser is in the atmosphere window, and is widely used in laser medical treatment, environmental monitoring and optical communication. In addition, the 2 渭 m laser can be used as the pump source of the infrared parametric oscillator and optical parametric amplifier of 3 5 渭 m and 8 渭 m 12 渭 m. Ho3 doped crystal is the preferred working material to produce high performance 2 渭 m laser, and 1.9 渭 m Tm:YLF laser is the ideal pump source. Therefore, it is very important to obtain 1.9 渭 m laser output with high power, high efficiency and high stability. In this paper, based on theoretical simulation, the narrow linewidth laser output is obtained on the basis of high power and high stability by using volume grating as resonant mirror and double F-P standard in cavity. In theory, the physical and spectral characteristics of Tm:YLF crystal are introduced. Based on the quasi three level rate equation model of Tm:YLF laser, the expressions of threshold, output power and slope efficiency are obtained by simplifying the equations. The effects of upconversion effect, cross relaxation, crystal doping concentration and length on the output characteristics of Tm:YLF laser are simulated and analyzed, which lays a theoretical foundation for the design and experiment of the subsequent laser. On the basis of the Tm:YLF crystal thermal model, the crystal temperature distribution is analyzed and simulated. The crystal size is 3 脳 3 脳 12 mm 3 and the doping concentration is 3.5 at. The mode matching and stability of the "L-type" resonator under different parameters are simulated, and the parameters range of the resonator is designed, which lays a foundation for further experimental research. The size of the volume grating and F-P standard device are 6 脳 6 mm ~ 2 and 5.5 鹵1.5 nm respectively, and the thickness of the double F-P standard device is 0.1mm and 1 mm respectively, and the size of the volume grating is 6 脳 6 mm ~ 2 and the thickness is 5.5 鹵1.5 nm. In experiment, LD end-pumped Tm:YLF laser is built, and the effects of different cavity length, output mirror transmittance and curvature radius on the laser output characteristics are studied in turn, and the optimal cavity parameters are determined. A dual F-P standard device is inserted into the cavity to achieve a 17.8 W 1908.55nm laser output with a high stability. The linewidth is only 0.10 nm, and the maximum wavelength fluctuation range is only 0.34 nm. The slope efficiency and optical conversion efficiency of the laser are 42.89% and 35.86% respectively.
【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】：TN248

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李珊珊;夏海平;符立;董艷明;谷雪梅;章踐立;王冬杰;張約品;江浩川;陳寶玖;;Optimum fluorescence emission around 1.8μm for LiYF_4 single crystals of various Tm~(3+)-doping concentrations[J];Chinese Physics B;2014年10期

2 楊曉濤;;A narrow-linewidth continuous wave Ho:YALO_3 laser with Fabry Perot etalons[J];Chinese Physics B;2014年03期

3 金光虎;夏海波;李海峰;張偉;;2微米激光在腎盂腫瘤根治術(shù)中的應(yīng)用[J];內(nèi)蒙古醫(yī)學(xué)雜志;2013年08期

4 魏磊;胡學(xué)浩;韓隆;吳軍勇;王克強(qiáng);;激光二極管雙端抽運(yùn)Tm:YAP激光器[J];中國激光;2011年05期

5 張曉娟;王立新;蔡軍;許宏;;室溫工作的全固態(tài)Tm:YAP激光器[J];光電技術(shù)應(yīng)用;2010年04期

6 羅光恒;劉軍;王元林;何堅(jiān);楊秀書;陳衛(wèi)紅;石華;朱建國;孫兆林;;2微米激光治療非肌層浸潤性膀胱腫瘤的療效分析[J];現(xiàn)代泌尿生殖腫瘤雜志;2010年03期

7 王月珠;段小明;柯亮;姚寶權(quán);趙廣軍;;室溫下高效率連續(xù)波激光二極管端面抽運(yùn)Tm:YAP激光器[J];中國激光;2009年07期

8 姚寶權(quán);鄭亮亮;楊曉濤;王天衡;段小明;趙廣軍;董勤;;Judd-Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser[J];Chinese Physics B;2009年03期

9 林志鋒;高明偉;高春清;;激光二極管端面抽運(yùn)Tm:YAG激光器[J];中國激光;2007年02期

10 李曉霞;;國外海軍光電對抗裝備綜述[J];現(xiàn)代軍事;2005年10期

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