激光二极管侧面抽运免温控激光器的研究
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摘要
为了解决激光二极管抽运波长随温度漂移导致激光器输出能量下降的问题,采用激光二极管抽运源波长匹配及凹凸稳定谐振腔技术实现免温控,并进行了理论分析和实验验证。该激光器腔长210mm,电光转换效率5.7%;输出单脉冲能量大于60mJ,在10℃～30℃范围内,能量稳定度优于5%;激光器输出光斑直径4mm、脉冲宽度8ns、激光器10Hz工作时,激光远场束散角为1.1mrad。结果表明,实验与理论分析计算结果符合,该激光二极管侧面抽运免温控激光器可在一定温度范围内保持稳定的能量输出。该理论分析与方案对研究免温控激光器具有重要意义。
In order to solve the problem that the laser output energy decreases when laser diode pump wavelength drifts with temperature,the technology of laser diode pump source wavelength matching and concave-convex stable resonator are used to realize temperature-free control.After theoretical analysis and experimental verification,the results show that,when the length of laser cavity is 210 mm,electro-optic conversion efficiency is 5.7%.Output single pulse energy is more than 60 mJ,and the energy stability is better than 5% in the range of 10℃～30℃.Laser output spot diameter is 4mm,pulse width is 8s,and laser far-field beam divergence angle is 1.1mrad at 10 Hz.The experimental results are in agreement with the theoretical analysis.The laser diode side-pumped temperature-free laser can maintain a stable energy output in a certain temperature range.The theoretical analysis and the scheme are of great significance for the study on temperature-free-controlled lasers.
In order to solve the problem that the laser output energy decreases when laser diode pump wavelength drifts with temperature,the technology of laser diode pump source wavelength matching and concave-convex stable resonator are used to realize temperature-free control.After theoretical analysis and experimental verification,the results show that,when the length of laser cavity is 210 mm,electro-optic conversion efficiency is 5.7%.Output single pulse energy is more than 60 mJ,and the energy stability is better than 5% in the range of 10℃～30℃.Laser output spot diameter is 4mm,pulse width is 8s,and laser far-field beam divergence angle is 1.1mrad at 10 Hz.The experimental results are in agreement with the theoretical analysis.The laser diode side-pumped temperature-free laser can maintain a stable energy output in a certain temperature range.The theoretical analysis and the scheme are of great significance for the study on temperature-free-controlled lasers.
引文
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[4]CREPY B,CLOSSE G,CRUZ J D,et al.Athermal diode-pumped laser designator modules for targeting application[J].Proceedings of the SPIE,2012,8541:85410R.
[5]WANG J.Design of an advanced diode-pumped solid state laser for high-altitude airborne operations[J].Proceedings of the SPIE,2005,5659:163-170.
[6]RAPAPORT A,ZHAO S,XIAO G,et al.Temperature dependence of the 1.06-microm stimulated emission cross section of neodymium in YAG and in GSGG[J].Applied Optics,2002,41(33):7052-7057.
[7]SCHILLING B W,CHINN S R,HAYS A D,et al.End-pumped1.5μm monoblock laser for broad temperature operation[J].Applied Optics,2006,45(25):6607-6615.
[8]STEINVALL O.Review of laser sensing devices and systems[J].Proceedings of the SPIE,2005,5983:598303.
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[10]LIU Y P,PENG X J,ZHAO G,et al.Structure design and analysis of cooling parts of compact lasers[J].Laser Technology,2017,41(6):886-889(in Chinese).
[11]ZHAO G,LI J,PENG X J,et al.Compact repetitive diode pump slab laser without thermoelectric cooler[J].Laser Technology,2016,40(5):625-629(in Chinese).
[12]KOECHNER W.Solid-state laser engineering[M].Beijing:Science Press,2002:18-22(in Chinese).
[13]MEISTER J,FRANZEN R,APEL C,et al.Multireflection pumping concept for miniaturized diode-pumped solid-state lasers[J].Applied Optics,2004,43(31):5864-5869.
[14]ZHOU Sh H,ZHAO H,TANG X J.High average power laser diode pumped solid-state-laser[J].Chinese Journal of Lasers,2009,36(7):1605-1618(in Chinese).
[15]CHEN H T,CHE X H,XU H W,et al.Study on high-power laser diodes as pumping source at high operating temperature[J].Chinese Journal of Lasers,2010,37(11):2799-2802(in Chinese).