18 mJ,100 Hz飞秒钛宝石激光放大器

张伟; 滕浩; 沈忠伟; 何鹏; 王兆华; 魏志义

doi:10.7498/aps.65.224204

摘要

采用环形腔再生放大及四通放大的两级放大方案，在重复频率100 Hz、单脉冲能量75.1 mJ的倍频Nd：YAG激光抽运下，通过啁啾脉冲放大飞秒钛宝石激光，获得了单脉冲能量25.4 mJ的放大输出，对应能量转换效率33.8%.经光栅压缩器补偿色散后的单脉冲能量为18.3 mJ，脉冲宽度为37.8 fs，对应峰值功率0.48 TW.测量其脉冲能量稳定性为3.6%，光束质量M2因子在X和Y方向上分别为1.8，1.6.

关键词:

Abstract

High energy and high repetition rate femtosecond Ti:sapphire lasers are widely used in isolated attosecond pulses and high-order harmonic generation. Enhancing the driving laser energy is a convenient and effective way to improve attosecond pulse energy. A 1 kHz or higher repetition rate millijoule level femtosecond Ti:sapphire amplifier is generally used to generate isolated attosecond. However, due to the limitation of its green pump laser energy, the energy of femtosecond Ti:sapphire laser is limited to several millijoules. Appropriately reducing the requirements for repetition rate, realizing high energy driving laser will significantly improve attosecond pulse energy and extend its application scope. Meanwhile, a 532 nm pump laser from frequency doubled 1064 nm Nd:YAG flash lamp pumped laser at 100 Hz repetition rate can achieve high pump energy with lower cost. Accordingly, we develope a 100 Hz repetition rate high energy amplifier based on Ti:sapphire crystal. The femtosecond amplifier system consists of oscillator, stretcher, ring cavity regenerative amplifier, four-pass amplifier and grating compressor. The ring cavity regenerative amplifier is the first amplifier as pre-amplifier, and the four-pass amplifier is the booster amplified-stage. 80 MHz seed pulse from the oscillator has a full width at half maximum bandwidth of 61 nm with a 20 fs duration. Then the seed pulses are stretched to 200 ps with a Martinez grating stretcher, rotated to vertical polarization and injected into the regenerative amplifier. The amplified uncompressed 1 kHz repetition rate laser pulses with 3 mJ pulse energy are selected to be 100 Hz and input into the four-pass amplifier. With a pulse energy of 75.1 mJ, wavelength at 532 nm flash lamp pumped pump laser at 100 Hz repetition rate, single pulse energy up to 25.4 mJ is obtained from a Ti:sapphire crystal, corresponding to a high energy conversion efficiency of 33.8%. We believe that higher energy should be possible if the pump energy can be further increased. After expanding the beam to 10 mm in diameter, the amplified chirped pulse is compressed using a four-pass, single grating compressor, with an overall efficiency of 72%. The highest pulse energy after compression is 18.3 mJ. For a fluctuation of the 100 Hz pump laser is as high as 3.4% for over 10000 shots, the 3.6% energy stability of the amplifier has a room to be improved. The typical spectrum bandwidth after the compressor is 39 nm, which can support transform-limited pulse duration of 32.8 fs. After fine dispersion compensation by the compressor, A pulse duration of 37.8 fs is measured using a single shot autocorrelator (Minioptic Technology, Inc). In addition, the spatial profile of the output beam from the compressor is measured using a commercial laser beam analyzer (Spiricon, Inc). The beam quality M2 factor are 1.8 and 1.6 in X and Y directions, respectively. In summary, a peak power of 0.48 TW compact 100 Hz femtosecond laser with pulse duration of 37.8 fs, pulse energy of 18.3 mJ is achieved from a two-stage amplifier system based on Ti:sapphire crystal. We believe that with a more stable and better spatial profile pump source, even better performance can be obtained by this scheme. Nevertheless, the current results show that this system should be favorable for high energy attosecond pulse generation and further amplification such as Terawatt system.

Keywords:

作者及机构信息

1.
首都医科大学附属北京同仁医院, 北京同仁眼科中心, 北京市眼科研究所; 北京市眼科学与视觉科学重点实验室; 国家眼科诊断与治疗工程技术研究中心, 北京 100005;

2.
中国科学院物理研究所, 北京凝聚态物理国家实验室, 北京 100190

通信作者: 张伟, zhangwei0724@163.com;zywei@iphy.ac.cn ; 魏志义, zhangwei0724@163.com;zywei@iphy.ac.cn

基金项目: 国家重大科学仪器设备开发专项基金（批准号：2012YQ120047）和国家自然科学基金（批准号：11434016）资助的课题.

Authors and contacts

1.
Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University;Beijing Key Laboratory of Ophthalmology and Visual Sciences;National Engineering Research Center of Ophthalmology, Beijing 100005, China;

2.
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: Zhang Wei, zhangwei0724@163.com;zywei@iphy.ac.cn ; Wei Zhi-Yi, zhangwei0724@163.com;zywei@iphy.ac.cn

Funds: Project supported by the Special Foundation of State Major Scientific Instrument and Equipment Development of China (Grant No. 2012YQ120047) and National Natural Science Foundation of China (Grants No. 11434016).

参考文献

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施引文献

[1]	Strickland D, Mourou G 1985Opt. Commun. 55 447
[2]	Lu X, Chen S Y, Ma J L, Hou L, Liao G Q, Wang J G, Han Y J, Liu X L, Teng H, Han H N 2015Sci. Rep. 5 15515
[3]	Horio T, Suzuki Y, Suzuki T 2016J. Chem. Phys. 145 044307
[4]	Zhang J Y, Wang R, Chen B, Ye P, Zhang W, Zhao H Y, Zhen J, Huang Y F, Wei Z Y, Gu Y 2013Laser. Surg. Med. 45 450
[5]	Ito S, Ishikawa H, Miura T, Takasago K, Endo A, Torizuka K 2003Appl. Phys. B:Lasers Opt. 76 497
[6]	Wang Z H, Liu C, Shen Z W, Zhang Q, Teng H, Wei Z Y 2011Opt. Lett. 36 3194
[7]	Dalui M, Wang W M, Trivikram T M, Sarkar S, Tata S, Jha J, Ayyub P, Sheng Z M, Krishnamurthy M 2015Sci. Rep. 5 11930
[8]	Remington B A, Takabe H 1999Science 284 1488
[9]	Gilbertson S 2010Phys. Rev. A 81 043810
[10]	Schmidt B E, Shiner A D, Lassonde P, Kieffer J C, Corkum P B, Villeneuve D M, Legare F 2011Opt. Express 19 6858
[11]	Tian Y C, Tian H, Wu Y L, Zhu L L, Tao L Q, Zhang W, Shu Y, Xie D, Yang Y, Wei Z Y, Lu X H, Shih C K, Zhao J M 2015Sci. Rep. 5 10582
[12]	Liu J, Li X F, Chen X W, Jiang Y L, Li R X 2007Acta Phys. Sin. 56 1375(in Chinese)[刘军, 李小芳, 陈晓伟, 姜永亮, 李儒新, 徐至展2007 56 1375]
[13]	Ye P, He X K, Teng H, Zhan M J, Zhong S Y, Zhang W, Wang L F, Wei Z Y 2014Phys. Rev. Lett. 113 073601
[14]	Wang L F, He X K, Teng H, Yun C X, Zhang W, Wei Z Y 2015Appl. Phys. B:Lasers Opt. 121 81
[15]	Goulielmakis E 2008Science 320 1614
[16]	Wu Y, Cunningham E, Zang H, Li J, Chini M, Wang X, Wang Y, Zhao K, Chang Z 2013Appl. Phys. Lett. 102 201104
[17]	Zhang W, Teng H, Wang Z H, Shen Z W, Wei Z Y 2013Appl. Opt. 52 1517

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