本文選題：Er3+/Yb3+共摻磷酸鹽玻璃 + Co2+:MgAl2O4��； 參考：《北京工業(yè)大學(xué)》2015年碩士論文

【摘要】：激光二極管(LD)泵浦的鉺玻璃被動調(diào)Q全固態(tài)激光器可以產(chǎn)生1535nm附近的激光,同時其具有結(jié)構(gòu)簡單、體積小、便于攜帶等特點,在激光雷達(dá)、激光測距、目標(biāo)指示、激光醫(yī)療和光纖通信中都有著廣泛的應(yīng)用需求。本論文設(shè)計了一款抗干擾能力強、結(jié)構(gòu)緊湊、實際應(yīng)用性價比非常高的微型化激光器。具體內(nèi)容如下:1、通過對Er3+/Yb3+共摻磷酸鹽玻璃三能級系統(tǒng)的速率方程進行分析,計算出泵浦光斑半徑、最佳泵浦位置以及腔內(nèi)往返損耗對激光影響。考慮在Er3+/Yb3+共摻磷酸鹽玻璃晶體中,Yb3+主要起到敏化作用,Er3+摻雜濃度一定的情況下,Yb3+摻雜濃度決定著晶體對泵浦光的吸收效率。根據(jù)小信號增益公式,分析計算了增益介質(zhì)對泵浦光吸收的最佳長度。2、分析1.5μm激光被動調(diào)Q晶體,根據(jù)Degnan被動調(diào)Q理論,計算不同初始透過率的調(diào)Q晶體所對應(yīng)的輸出鏡最佳透過率,優(yōu)化激光輸出條件。3、激光器的總體結(jié)構(gòu)設(shè)計,我們主要考慮兩點:(1)結(jié)構(gòu)緊湊穩(wěn)定,一體化、微型化;(2)寬溫度范圍下激光器正常工作,散熱性。激光器封裝時,內(nèi)部充入惰性氣體,保證激光腔內(nèi)元件不因溫度、濕度變化出現(xiàn)結(jié)霜現(xiàn)象而損壞,增強了激光器工作的穩(wěn)定性。解決了目前激光器在激光測距中存在的受溫度、濕度影響比較大、激光器自身體積過大和不方便安裝攜帶等問題。4、本文在理論分析基礎(chǔ)上,以中心波長940nm二極管激光器作為泵浦源,選取Er3+/Yb3+共摻磷酸鹽玻璃作為增益介質(zhì),Co2+:MgAl2O4作為被動調(diào)Q晶體,在泵浦能量9mJ,重復(fù)頻率10 Hz,泵浦脈寬5ms的情況下,獲得了脈沖能量130μJ,脈寬5ns,峰值功率20kW以上激光輸出,光光轉(zhuǎn)換效率1.5%。激光中心波長1535nm,線寬小于0.02nm,光束質(zhì)量因子M2約1.3,激光輸出的不穩(wěn)定度小于5%。激光自由輸出時,光光轉(zhuǎn)換效率達(dá)到了17%。
[Abstract]:Laser diode (LD) pumped erbium glass passively switched Q all solid state laser can produce laser near 1535nm. At the same time, it has the characteristics of simple structure, small size, easy to carry and so on. It has wide application requirements in laser radar, laser range finding, target indication, laser medical treatment and optical fiber communication. This paper has designed an anti-jamming energy. Strong force, compact structure, practical application of very cost-effective micro laser. The specific contents are as follows: 1, through the analysis of the rate equation of the Er3+/Yb3+ Co doped phosphate glass three level system, the pump spot radius, the best pump position and the effect of the cavity return loss on the laser are calculated. The Co doped phosphate glass is considered in the case of Co doped phosphate glass. In the crystal of glass, Yb3+ mainly plays a sensitizing effect. Under the condition of certain Er3+ doping concentration, the doping concentration of Yb3+ determines the absorption efficiency of the crystal to pump light. According to the formula of small signal gain, the optimum length of the gain medium to the absorption of pump light is analyzed and calculated, and the 1.5 u m laser passive Q crystal is analyzed. According to the theory of Degnan passive Q, the calculation is calculated. The best transmittance of the output mirror of the Q crystal with different initial transmittance, the optimization of the laser output condition.3, the overall structure design of the laser, we mainly consider two points: (1) the structure is compact, stable, integrated, miniaturized, and (2) the laser is working normally and heat dissipation under the wide temperature range. The internal filling of the inert gas in the laser package ensures that the laser is filled with inert gases. The elements of the laser cavity are not damaged by the frosting phenomenon of the temperature and humidity, which enhances the stability of the laser work, and solves the problem that the laser is affected by the temperature, the humidity is larger, the volume of the laser is too large and the installation and carrying of the laser in the laser range finder, and the central wave is based on the theoretical analysis on the basis of the theoretical analysis. A long 940nm diode laser is used as the pump source, and Er3+/Yb3+ Co doped phosphate glass is selected as the gain medium. Co2+: MgAl2O4 is used as a passive Q crystal. In the case of pump energy 9mJ, repetition frequency 10 Hz and pump pulse width 5ms, the pulse energy is 130 micron, pulse width 5ns, peak power 20kW above laser output, optical conversion efficiency 1.5%. laser The center wavelength is 1535nm, the line width is less than 0.02nm, the beam quality factor M2 is about 1.3. The laser output instability is less than the free output of the 5%. laser, the optical conversion efficiency is 17%.
【學(xué)位授予單位】：北京工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

【參考文獻】

相關(guān)期刊論文 前2條

1 宋峰;;Er~(3+)/Yb~(3+)共摻磷酸鹽玻璃的發(fā)光與1.54μm激光性能[J];激光與光電子學(xué)進展;2007年04期

2 保Ymq，

本文編號：1974157