高功率、高效率调Q绿光抽运的钛宝石宽调谐纳秒脉冲激光
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摘要
自行研制出钛宝石晶体抽运的波长为532 nm的全固态高功率激光器,实现了高功率、高转换效率的可调谐钛宝石激光输出。使用3列重复频率为1 kHz的激光二极管阵列对称式抽运Nd:YAG晶体,通过调Q及腔内倍频,获得功率为37.8 W、波长为532 nm的抽运光,每个激光二极管的抽运脉冲包络内包含5个调Q脉冲,单脉冲宽度为90 ns,重复频率为5 kHz。采用该绿光抽运钛宝石晶体,获得733.5～871.1 nm波长范围内的连续调谐激光,在771 nm处获得的输出功率最大,为8.26 W,光-光转换效率高达42%,脉冲宽度为14 ns,30 min内输出功率稳定性优于±4.4%。
Herein, an all-solid-state widely tunable Ti:sapphire laser pumped by a home-made 532 nm laser with high power and high conversion efficiency is demonstrated. First, a maximum output power of 37.8 W at 532 nm is obtained by Q-switching and intracavity frequency doubling via a Nd:YAG crystal that is symmetrically pumped by three 1 kHz laser diode(LD) arrays. The envelope of each LD pulse contains five Q-switched pulses with a duration of 90 ns and repetition rate of 5 kHz. Using the green light to pump the Ti:sapphire crystal, a 733.5-871.1 nm widely tunable laser is then obtained. The maximum output power at 771 nm is 8.26 W, the optical-optical conversion efficiency is 42%, and the pulse duration is 14 ns. Moreover, the output power stability is superior to ±4.4% within 30 min.
Herein, an all-solid-state widely tunable Ti:sapphire laser pumped by a home-made 532 nm laser with high power and high conversion efficiency is demonstrated. First, a maximum output power of 37.8 W at 532 nm is obtained by Q-switching and intracavity frequency doubling via a Nd:YAG crystal that is symmetrically pumped by three 1 kHz laser diode(LD) arrays. The envelope of each LD pulse contains five Q-switched pulses with a duration of 90 ns and repetition rate of 5 kHz. Using the green light to pump the Ti:sapphire crystal, a 733.5-871.1 nm widely tunable laser is then obtained. The maximum output power at 771 nm is 8.26 W, the optical-optical conversion efficiency is 42%, and the pulse duration is 14 ns. Moreover, the output power stability is superior to ±4.4% within 30 min.
引文
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[21]Xu R Q,Li J,Ni X W.A study on the dynamic characteristics of a quasi-continue ware Ti:sapphire[J].Journal of Optoelectronics·Laser,1999,10(6):512-515.徐荣青,李军,倪晓武.准连续钛蓝宝石激光器动力学特性的研究[J].光电子·激光,1999,10(6):512-515.
[2]Sibbett W,Lagatsky A A,Brown C T A.The development and application of femtosecond laser systems[J].Optics Express,2012,20(7):6989.
[3]Kuwamoto T,Honda K,Takahashi Y,et al.Magneto-optical trapping of Yb atoms using an intercombination transition[J].Physical Review A,1999,60(2):R745-R748.
[4]Ell R,Morgner U,Krtner F X,et al.Generation of5-fs pulses and octave-spanning spectra directly from a Ti:sapphire laser[J].Optics Letters,2001,26(6):373-375.
[5]Wang X L,Hu X H,Xu P,et al.Ti:sapphire femtosecond pulses pumped directly by green diode lasers[J].Chinese Journal of Lasers,2017,44(7):0701002.王向林,胡晓鸿,徐鹏,等.绿光半导体激光器直接抽运的钛宝石飞秒脉冲[J].中国激光,2017,44(7):0701002.
[6]Li H J,Zhang M,Li F Q.High-power singlefrequency 461 nm generation from an intracavity doubling of Ti:sapphire laser with LBO[J].Chinese Journal of Lasers,2016,43(3):0302003.李慧娟,张淼,李凤琴.高功率单频LBO腔内倍频461nm钛宝石激光器[J].中国激光,2016,43(3):0302003.
[7]Villa F,Chiummo A,Giacobino E,et al.Highefficiency blue-light generation with a ring cavity with periodically poled KTP[J].Journal of the Optical Society of America B,2007,24(3):576-580.
[8]Peng Y,Zhao Y,Li Y,et al.Three methods to lock the second harmonic generation for 461 nm[J].Chinese Journal of Lasers,2010,37(2):345-350.彭瑜,赵阳,李烨,等.3种方法实现461nm外腔倍频激光器的锁定[J].中国激光,2010,37(2):345-350.
[9]Cruz L S,Cruz F C.External power-enhancement cavity versus intracavity frequency doubling of Ti:sapphire lasers using BIBO[J].Optics Express,2007,15(19):11913-11921.
[10]Xu C,Dai S B,Guo C,et al.A high-pulse-energy high-beam-quality tunable Ti:sapphire laser using a prism-dispersion cavity[J].Chinese Physics Letters,2017,34(3):034206.
[11]Zhao X J,Chen R P,Tengroth C,et al.Solid-state tunable kHz ultraviolet laser for Raman applications[J].Applied Spectroscopy,1999,53(10):1200-1205.
[12]Suganuma T,Kubo H,Wakabayashi O,et al.157-nm coherent light source as an inspection tool for F2laser lithography[J].Optics Letters,2002,27(1):46-48.
[13]Kulatilaka W D,Anderson T N,Bougher T L,et al.Development of injection-seeded,pulsed optical parametric generator/oscillator systems for highresolution spectroscopy[J].Applied Physics B,2005,80(6):669-680.
[14]Malcolm G P A,Ferguson A I.Ti:sapphire laser pumped by a frequency doubled diode pumped Nd:YLF laser[J].Optics Communications,1991,82(3/4):299-304.
[15]Imahoko T,Takasago K,Kamata M,et al.Development of a highly stable Yb:YAG thin disk pulsed green laser for high power Ti:sapphire based amplifier at 100 kHz repetition rate[J].Applied Physics B,2007,89(2/3):217-222.
[16]Wagner G,Behrendt A,Wulfmeyer V,et al.Highpower Ti:sapphire laser at 820 nm for scanning ground-based water-vapor differential absorption lidar[J].Applied Optics,2013,52(11):2454-2469.
[17]Zou L,Ding X,Wei Q F,et al.High power,high efficiency,all-solid-state quasi-continuous-wave Ti:sapphire laser system[J].Chinese Journal of Lasers,2004,31(12):1409-1412.邹雷,丁欣,魏权夫,等.高功率、高效率、全固态准连续钛宝石激光器[J].中国激光,2004,31(12):1409-1412.
[18]Ding X,Li X,Sheng Q,et al.High power widely tunable narrow linewidth all-solid-state pulsed titanium-doped sapphire laser[J].Chinese Physics Letters,2011,28(9):094205.
[19]Wang N,Wang R,Teng H,et al.Tunable deep UVnarrow linewidth laser by frequency converted Ti:sapphire laser at 5 kHz repetition rate[C].Proceedings of Advanced Solid-State Photonics,2012,AM4A:27.
[20]Zhang S K,Wang Q Y,Peng H S.Titanium-doped sapphire and ultrashort pulse laser[J].High Power Laser&Particle Beams,1997,9(1):149-156.张树葵,王清月,彭翰生.掺钛蓝宝石与超短脉冲激光[J].强激光与粒子束,1997,9(1):149-156.
[21]Xu R Q,Li J,Ni X W.A study on the dynamic characteristics of a quasi-continue ware Ti:sapphire[J].Journal of Optoelectronics·Laser,1999,10(6):512-515.徐荣青,李军,倪晓武.准连续钛蓝宝石激光器动力学特性的研究[J].光电子·激光,1999,10(6):512-515.