-
摘要: 为了实现激光二极管端面泵浦Nd：YAG晶体温度场的精确计算，在晶体端面导热边界条件下建立热模型。首先根据热传导方程，以解析分析理论为基础，应用常数变易法和特征函数法，在考虑晶体端面存在热交换情况下，计算得到808 nm激光泵浦Nd：YAG圆棒晶体的温度场分布，分析了泵浦激光功率、光束半径及超高阶次等因素对晶体温度场分布的影响。分析结果表明：当功率为60 W、光斑半径为0.4 mm的泵浦光作用于半径为1.5 mm，长度为5 mm的Nd：YAG圆棒晶体时，该晶体内部最高温升出现在泵浦端面中心处，最高温升为426.3 K，得到晶体的热透镜焦距为272.98 mm。由于在计算中考虑了空气的导热作用对晶体温度场分布的影响，更符合实际情况，因此结果能更真实反映晶体内部温度场的分布情况。本文研究为精确分析相关激光晶体的温度场分布提供了指导，并为激光器性能的优化提供了理论依据。
-
关键词:
- 激光 /
- 晶体温度场 /
- 解析法 /
- Nd:YAG圆棒晶体 /
- 热效应
Abstract: A thermal model was established under air conduction boundary conditions in order to accurately obtain the temperature distribution of an Nd:YAG rod crystal end-pumped with a laser diode. Firstly, the crystal's temperature distribution was calculated through analytical theory on the basis of the heat conduction equation. The crystal was operated with a pump diode laser incident center operating at a wavelength of 808 nm. Secondly, the influences of the pump laser parameters, including power, beam radius and orders of super Guass were quantitatively analyzed. The results indicate that the maximum temperature rise is located at the center of the pump end and its value can rise to 426.3 K when an Nd:YAG rod crystal with length of 5 mm and a radius of 1.5 mm is pumped by a 808 nm laser with 60 W power and spot radius of 400 μm. The thermal focal length of the crystal is 272.98 mm. The effects of the thermal air transfer on the temperature field distribution of the crystal are considered and the results are therefore more accurate. This research can provide a method for further precise analysis of the temperature field distribution of other laser crystals and lays a theoretical foundation for the optimization of laser performance.-
Key words:
- laser /
- crystal temperature field /
- analytic method /
- Nd:YAG rod crystal /
- heat effect
-
图 1 激光二极管端面泵浦Nd:YAG圆棒晶体结构图
Figure 1. Schematic diagram of Nd:YAG rod crystal end-pumped by LD
图 3 不同泵浦光功率的Nd:YAG晶体温度分布
Figure 3. Temperature distributions along Nd:YAG crystal pumped by 808 nm pump laser under different powers
图 4 不同光斑半径泵浦光的Nd:YAG晶体温度分布
Figure 4. Temperature distributions of Nd:YAG crystal pumped by 808 nm pump laser under different spot radius
图 5 不同超高斯阶次泵浦光的Nd:YAG晶体温度场
Figure 5. Temperature fields of Nd:YAG pumped by 808 nm pump laser with different super-Gaussian orders
-
[1] ZHOU B K, KANE T J, DIXON G J, et al.. Efficient frequency-stable laser-diode pumped Nd:YAG laser[J]. Opt. Lett., 1985, 10(2):62-64. doi: 10.1364/OL.10.000062 [2] BYER R L. Diode laser-pumped solid state lasers[J]. Science, 1988, 239(4841):742-747. doi: 10.1126/science.239.4841.742 [3] 叶子青, 荆茁, 卜轶坤, 等.6.5 W LD泵浦914nm钒酸钇激光器[J].光学 精密工程, 2007, 15(3):321-325. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gxjmgc200703004YE Z Q, JING ZH, BO Y K, et al.. 6.5 W LD-pumped 914 nm Nd:YVO4 laser[J]. Opt. Precision Eng., 2007, 15(3):321-325.(in Chinese) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=gxjmgc200703004 [4] BONNEFOIS A M, GILBERT M, THRO P Y, et al.. Thermal lensing and spherical aberration in high-power transversally pumped laser rods[J]. Opt. Coummn., 2006, 259(1):223-235 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=55f4f1dec31834ee99af43a68975dbe6 [5] 李耀, 李阳, 王超.LD面阵侧面泵浦Nd:YAG晶体吸收光场研究[J].中国光学, 2018, 11(2):206-211 http://www.chineseoptics.net.cn/CN/abstract/abstract9577.shtmlLI Y, LI Y, WANG CH. Absorption light field of side-pumped Nd:YAG crystal in LD planar arrays[J]. Chinese Optics, 2018, 11(2):206-211.(in Chinese) http://www.chineseoptics.net.cn/CN/abstract/abstract9577.shtml [6] 张德平, 吴超, 张蓉竹, 等.LD端面泵浦分离式放大器结构的热效应研究[J].红外与激光工程, 2015, 44(8):2250-2255. doi: 10.3969/j.issn.1007-2276.2015.08.003ZHANG D P, WU CH, ZHANG R ZH, et al.. Study on thermal effect of LD end-pumped separated amplifier structure[J]. Infrared and Laser Engineering, 2015, 44(8):2250-2255.(in Chinese) doi: 10.3969/j.issn.1007-2276.2015.08.003 [7] 孙毅, 高云国, 邵帅.高功率激光热效应对合束系统的影响[J].光学 精密工程, 2015, 23(11):3097-3106. http://d.old.wanfangdata.com.cn/Periodical/gxjmgc201511013SUN Y, GAO Y G, SHAO SH. Influence of high power laser thermal effect on beam combination system[J]. Opt. Precision Eng., 2015, 23(11):3097-3106.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/gxjmgc201511013 [8] CHENAIS S, FORGET S, DRUON F, et al.. Direct and absolute temperature mapping and heat transfer measurements in diode end-pumped Yb:YAG[J]. Appl. Phys. B, 2004, 79(2):221-224 http://d.old.wanfangdata.com.cn/OAPaper/oai_arXiv.org_physics%2f0610061 [9] 付喜宏.LD泵浦全固态608.1 nm和频激光器[J].中国光学, 2015, 8(5):794-799. http://www.chineseoptics.net.cn/CN/abstract/abstract9347.shtmlFU X H. Diode-pumped all-solid-state sum-frequency mixing laser at 608.1 nm[J]. Chinese Optics, 2015, 8(5):794-799.(in Chinese) http://www.chineseoptics.net.cn/CN/abstract/abstract9347.shtml [10] 岱钦, 乌日娜, 宁日波, 等.热容运转模式下LD泵浦固体激光器的热效应分析[J].光学 精密工程, 2008, 16(6):1025-1030. http://d.old.wanfangdata.com.cn/Periodical/gxjmgc200806009DAI Q, WU R N, NING R B, et al.. Analysis of thermal effect of solid state lasers in heat capacity mode[J]. Opt. Precision Eng., 2008, 16(6):1025-1030.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/gxjmgc200806009 [11] 赵建涛, 冯国英, 杨火木, 等.薄片激光器热效应及其对输出功率的影响[J].物理学报, 2012, 61(8):084208-1-084208-7. http://d.old.wanfangdata.com.cn/Periodical/wlxb201208031ZHAO J T, FENG G Y, YANG H M, et al.. Analysis of thermal effect and its influence on output power of thin disk laser[J]. Acta. Phys. Sin., 2012, 61(8):084208-1-084208-7.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/wlxb201208031 [12] 岱钦, 李新忠, 王希军.YAG物理特性参量对LD泵浦固体激光器热效应的影响[J].光子学报, 2007, 36(12):2201-2204. http://d.old.wanfangdata.com.cn/Periodical/gzxb200712006DAI Q, LI X ZH, WANG X J. Influence of YAG materials property on thermal effects in LD side pumping solid state lasers[J]. Acta Photonica Sinica, 2007, 36(12):2201-2204.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/gzxb200712006 [13] 李隆, 聂建萍, 史彭, 等.激光二极管端面抽运YAG-Nd:YAG复合晶体棒温度场特性[J].中国激光, 2010, 37(4):917-922. http://d.old.wanfangdata.com.cn/Periodical/zgjg200605002LI L, NIE J P, SHI P, et al.. Temperature field characteristic of YAG-Nd:YAG composite crystal rod end-pumped by laser diode[J]. Chinse J. Lasers, 2010, 37(4): 917-922.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/zgjg200605002 [14] 姚育成, 刘丹琳, 黄楚云, 等.Tm:YAG激光器晶体热效应数值模拟[J].光子学报, 2016, 45(7):0714001-1-0714001-5. http://d.old.wanfangdata.com.cn/Periodical/zgysjsxb-e201307025YAO Y CH, LIU D L, HUANG CH Y, et al.. Crystal thermal effect simulation of Tm:YAG laser[J]. Acta Photonica Sinica, 2016, 45(7):0714001-1-0714001-5.(in Chinese) http://d.old.wanfangdata.com.cn/Periodical/zgysjsxb-e201307025 [15] NADGARAN H, SABAIAN M. Pulsed pump: thermal effects in solid-state lasers under super-Gaussian pulses[J]. Paramana J. Phys., 2006, 67(6):1119-1128. doi: 10.1007/s12043-006-0027-8 [16] 杨浩, 张引科, 贺艳平.激光二极管端面抽运圆截面激光晶体的热效应[J].中国激光, 2010, 37(1):49-53. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zgjg201001008YANG H, ZHANG Y K, HE Y P. Thermal effect of end-pumped laser crystal with circular cross-section[J]. Chinse J. Lasers, 2010, 37(1):49-53.(in Chinese) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=zgjg201001008 -
下载:
点击查看大图
图(6)
计量
- 文章访问数: 2754
- HTML全文浏览量: 1054
- PDF下载量: 157
- 被引次数: 0
