皮秒激光泵浦的亚10fs钛宝石激光器
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摘要
研制了高稳定Nd∶YVO_4皮秒激光振荡器,并在15 W、808nm激光泵浦下得到6 W的连续锁模皮秒激光输出,光-光效率为40%.对该皮秒激光进行单通放大后得到14 W的基频光输出,倍频后可以得到7 W的532nm皮秒激光,用作钛宝石振荡器的泵浦源.在4.5 W的皮秒532nm激光泵浦下,结合腔外压缩,得到了脉宽为9.4fs、平均功率为150mW的脉冲序列输出.调节钛宝石振荡器的腔长使其与皮秒振荡器的腔长一致时,可实现自触发克尔透镜锁模.实验结果表明皮秒激光泵浦可以有效地触发钛宝石激光器的自动锁模,输出飞秒脉冲序列.
A high-power Nd:YVO_4 picosecond laser was developed,and the continuously mode-locking with output power of 6 W was realized under 15 W808 nm pump power,corresponding to optical-tooptical conversion efficiency of 40%.The picoseond laser was amplified to 14 W by a single segment amplifier stage.After frequency multiplication,7 W picosecond laser was obtained,serving as pump source of Ti∶sapphire oscillator.Being pumped by 4.5 W 532 nm picosecond laser,the pulse trains output with pulse duration compressed to 9.4 fs and average power of 150 mW was obtained.By tuning the cavity length of the Ti:sapphire oscillator to decrease the difference between the two oscillators′cavity length,self-initiating Kerr-lens mode-locking was realized.The result shows that the picosecond laser pumping could trigger the Ti∶sapphire oscillator mode-locking and output femtosecond pulse trains.
A high-power Nd:YVO_4 picosecond laser was developed,and the continuously mode-locking with output power of 6 W was realized under 15 W808 nm pump power,corresponding to optical-tooptical conversion efficiency of 40%.The picoseond laser was amplified to 14 W by a single segment amplifier stage.After frequency multiplication,7 W picosecond laser was obtained,serving as pump source of Ti∶sapphire oscillator.Being pumped by 4.5 W 532 nm picosecond laser,the pulse trains output with pulse duration compressed to 9.4 fs and average power of 150 mW was obtained.By tuning the cavity length of the Ti:sapphire oscillator to decrease the difference between the two oscillators′cavity length,self-initiating Kerr-lens mode-locking was realized.The result shows that the picosecond laser pumping could trigger the Ti∶sapphire oscillator mode-locking and output femtosecond pulse trains.
引文
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[15] YAN X,LIU Q,WANG D,et al.Combined guiding effect in the end-pumped laser resonator[J].Optics Express,2011,19(7):6883-6902.
[16] KRAUSZ F,FERMANN M E,BRABEC T,et al.Femtosecond solid-state lasers[J].IEEE Journal of Quantum Electronics,1992,28(10):2097-2122.
[17] HAUS H A,FUJIMOTO J G,IPPEN E P.Structures for additive pulse mode locking[J].Journal of the Optical Society of America B,1991,8(10):2068-2076.
[2] MOULTON P F.Spectroscopic and laser characteristics of Ti∶Al2O3[J].Journal of the Optical Society of America B,1986,3(1):125-133.
[3] DURFEE C G,STORZ T,GARLICK J,et al.Direct diode-pumped Kerr-lens mode-locked Ti∶sapphire laser[J].Optics Express,2012,20(13):13677-13683.
[4] ELL R,MORGNER U,K RTNER F X,et al.Generation of 5-fs pulses and octave-spanning spectra directly from a Ti∶sapphire laser[J].Optics Letters,2001,26(6):373-375.
[5] YU Z,HAN H,ZHANG L,et al.Low-threshold sub-10fs mode-locked Ti∶sapphire laser pumped by 488nm fiber laser[J].Applied Physics Express,2014,7(10):102702.
[6] ELL R,ANGELOW G,SEITZ W,et al.Quasi-synchronous pumping of modelocked few-cycle Titanium Sapphire lasers[J].Optics Express,2005,13(23):9292-9298.
[7] SHEN Zhong-wei,WANG Zhao-hua,FAN Hai-tao,et al.A 4mJ femtosecond Ti∶sapphire regenerative amplifier at 1kHz repetition rate[J].Acta Physica Sinica,2014,63(10):1042115-2004190沈忠伟,王兆华,范海涛,等.输出能量4mJ的1kHz飞秒掺钛蓝宝石激光再生放大研究[J].物理学报,2014,63(10):104211.
[8] FAN Hai-tao,WANG Yan-zhi,WANG Zhao-hua,et al.All chirped mirrors long-term stable sub-8fs Ti:sapphire oscillator[J].Acta Physica Sinica,2014,64(14):144204范海涛,王胭脂,王兆华,等.全啁啾镜色散补偿的亚8fs钛宝石激光器[J].物理学报,2015,64(14):144204.
[9] HE Peng,TENG Hao,ZHANG Ning-hua,et al.A cavity mode size adjustable high average power Ti:sapphire femtosecond regenerative amplifier[J].Acta Physica Sinica,2016,65(24):244201何鹏,滕浩,张宁华,等.腔模可调的高平均功率飞秒激光再生放大器[J].物理学报,2016,65(24):244201.
[10]赵研英,王鹏,张炜,等.采用啁啾反射镜色散补偿的7fs掺钛蓝宝石激光振荡器[J].中国科学,2007,37(1):123-128.
[11] XU Xin-rui,FAN Rong-wei,CHEN Zhao-dong,et al.1.35GHz linearly tunable single-frequency Nd∶YVO4laser[J].Infrared and Laser Engineering,2016,45(11):1105001.徐新瑞,樊荣伟,陈兆东,等.1.35GHz线性调频Nd∶YVO4激光器[J].红外与激光工程,2016,45(11):1105001.
[12] LAPORTA P,BRUSSARD M.Design criteria for mode size optimization in diode-pumped solid-state lasers[J].IEEE Journal of Quantum Electronics,1991,27(10):2319-2326.
[13] MUKHOPADHYAY P K,RANGANATHAN K,GEORGE J,et al.1.6W of TEM00cw output at 1.06μm from Nd∶CNGG laser end-pumped by a fiber-coupled diode laser array[J].Optics&Laser Technology,2003,35(3):173-180.
[14] CHEN Y F,KAO C F,WANG S C.Analytical model for the design of fiber-coupled laser-diode end-pumped lasers[J].Optics Communications,1997,133(1):517-524.
[15] YAN X,LIU Q,WANG D,et al.Combined guiding effect in the end-pumped laser resonator[J].Optics Express,2011,19(7):6883-6902.
[16] KRAUSZ F,FERMANN M E,BRABEC T,et al.Femtosecond solid-state lasers[J].IEEE Journal of Quantum Electronics,1992,28(10):2097-2122.
[17] HAUS H A,FUJIMOTO J G,IPPEN E P.Structures for additive pulse mode locking[J].Journal of the Optical Society of America B,1991,8(10):2068-2076.