本文關(guān)鍵詞： 二極管抽運固體激光器 側(cè)面抽運 端面抽運 增益分布　出處：《西安工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：二極管激光器抽運的全固態(tài)激光器(DPL)具有全固態(tài)、體積小、使用壽命長、抽運效率高等諸多優(yōu)點,使得其在激光通訊、遙感探測、醫(yī)療、工業(yè)、軍事和國防等領(lǐng)域具有廣泛的應(yīng)用領(lǐng)域和前景,因而受到了研究者極大的關(guān)注。本論文對不同抽運結(jié)構(gòu)的DPL增益分布和激光器的輸出特性進行了研究,分析了不同抽運條件下抽運光和抽運結(jié)構(gòu)的特點,采用數(shù)值計算方法,計算了不同抽運條件下抽運光參數(shù)對激光工作晶體中的增益分布的影響；計算結(jié)果表明,抽運光束腰半徑越小,激光晶體的軸線上增益越大,垂直于軸線方向的徑向增益分布越集中；晶體的吸收系數(shù)越小,抽運均勻性就越好,但總的吸收效率下降；在吸收系數(shù)和束腰半徑過小時,晶體不能完全吸收抽運光的能量,抽運光利用率降低；此時在晶體側(cè)面抽運光出射面增鍍抽運光的增反射膜,能提高抽運光的能量利用效率。進而數(shù)值計算了不同抽運光束腰大小、束腰位置對激光器輸出特性的影響。給出抽運光束腰半徑越小,激光器輸出特性越好。特別是對端面抽運結(jié)構(gòu),存在一個最佳的抽運光束腰位置,使得激光器的輸出特性最好。最后通過端面抽運結(jié)構(gòu),實驗研究了光纖耦合LD的輸出功率特性和光譜特性,并進一步通過實驗比較研究了端面離軸抽運激光器的輸出功率和輸出光束質(zhì)量。
[Abstract]:Diode-pumped all-solid-state lasers (DPLs) have many advantages, such as all-solid-state, small size, long service life, high pumping efficiency and so on, which make them widely used in laser communication, remote sensing, medical treatment, industry, etc. Military and national defense have a wide range of applications and prospects, which has attracted great attention of researchers. In this paper, the gain distribution of DPL with different pumping structures and the output characteristics of lasers are studied. The characteristics of pumping light and pumping structure under different pump conditions are analyzed. The influence of pump light parameters on the gain distribution in laser operating crystals is calculated by numerical calculation method. The smaller the beam waist radius, the greater the gain on the axis of the laser crystal, the more concentrated the radial gain distribution perpendicular to the axis, the smaller the absorption coefficient of the crystal, the better the pumping uniformity, but the lower the overall absorption efficiency. When the absorption coefficient and the beam waist radius are too small, the crystal can not completely absorb the energy of the pumped light, and the utilization ratio of the pump light decreases. The effect of different pump waist size and beam waist position on laser output characteristics is numerically calculated. The smaller the beam waist radius is, the smaller the beam waist radius is. The better the output characteristics of the laser, especially for the end pumped structure, there is an optimal pump beam waist position, so that the output characteristics of the laser is the best. The output power and spectral characteristics of fiber coupled LD are experimentally studied, and the output power and output beam quality of the end-face off-axis pumped laser are compared.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248.1

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本文編號：1539279