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5月13号学术报告

来源： 发布时间：2013-05-14【字体：大 中 小】

题目：Ultrafast particle and photon sources driven by intense laser‐plasma interaction

姓名：Jyhpyng Wang

单位：Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei,Taiwan

时间：2013年5月15号（周一）下午2:00

地点：行政楼第五会议室

 

Abstract

During 2001-2008 we constructed a 10-TW laser first at Institute of Atomic and Molecular Sciences and then a 100-TW laser at National Central University in Taiwan. These lasers was used for the development of laser-wakefield electron accelerator, extreme-UV laser, high harmonic generation, hard x-ray sources, few-cycle infrared sources, and experiments on plasma nonlinear optics.

In the development of laser-wakefield electron accelerator, by using a 9-mm laser-fabricated transient plasma waveguide to confine the pump pulse and extend the acceleration distance, a monoenergetic electron bunch with 300-MeV energy and a maximum of 200-pC bunch charge can be produced with 1.3-J pump energy. The electron energy spread is 13%. When the hydrogen gas is mixed with an optimal fraction of 10% argon gas, which seeds the accelerator by optical-field ionization, the trapping threshold can be reduced to 600 mJ. At this trapping threshold the energy of the accelerated electron is 200 MeV with 15% spread, and the bunch charge is 30 pC [1].

In the development of extreme-UV laser, we demonstrated that by using a 9-mm laser-fabricated transient plasma waveguide to overcome ionization defocusing, extreme-UV lasing at 32.8 nm with 1011 photons per pulse can be achieved with a pump energy of only 235 mJ [2]. Furthermore, by injecting the EUV laser with high-harmonic generation, the emittance of the extreme-UV laser can be reduced by 17 folds [3]. With the same scheme recently we achieved 1012 photons per pulse by increasing the pump-pulse energy to 600 mJ [4].

In the development of ultrafast infrared sources, we demonstrated an efficient method for generating femtosecond mid-infrared pulses by utilizing the strong nonlinear phase modulation associated with laser-plasma interaction in the bubble regime. The pulse duration is as short as 15 fs and the pulse energy is as large as 3 mJ. The infrared pulse is encapsulated in the bubble created by the ponderomotive force before exiting the plasma, hence is not absorbed by the plasma [5].

[1] Y.-C. Ho et al., Phys. Plasmas 18, 063102 (2011).

[2] M.-C. Chou et al., Phys. Rev. Lett. 99, 063904 (2007).

[3] P.-H. Lin et al., Opt. Lett. 34, 3562 (2009).

[4] B.-K. Chen et al., Appl. Phys. B 106, 817 (2012).

[5] C.-H. Pai et al., Phys.Rev. A 82, 063804 (2010)

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