5-10 May 2019
MedILS
Europe/Berlin timezone

Generation of tunable relativistic, single-cycle infrared pulses from a tailored plasma structure

8 May 2019, 17:35
20m
Meeting Room (MedILS)

Meeting Room

MedILS

Speaker

Prof. Chih-Hao Pai (Department of Engineering Physics, Tsinghua University, Beijing, China)

Description

During the past decade, the development of intense few-cycle mid-infrared (mid-IR, λ<5 µm) laser sources has made significant progress, which has opened many opportunities for infrared nonlinear optics, high-harmonic generation and pump-probe experiments in the “molecular fingerprint” region. However, even longer carrier wavelength (~10 µm) are needed in many applications. It is one of the current challenges to generate high-energy, ultra-short long-wavelength IR pulses (LWIR), beyond the capability of existing methods including optical parametric amplifiers, high pressure carbon-dioxide lasers, difference frequency generation, and four-wave mixing, etc. In this work, we propose a new scheme that utilizes asymmetric self-phase modulation in a tailored plasma density structure to generate multi-millijoule energy, single-cycle LWIR pulses tunable in the spectral range of 5-14 μm. We experimentally demonstrate this novel scheme for the first time. An intense single-cycle IR pulse with a central wavelength of 9.4 µm and energy of 3.4 mJ is generated using a ~580 mJ, 36 fs, 810 nm drive laser. Furthermore, the tunability of the IR wavelength in the range of 3-19 µm is also demonstrated through simple adjustment of the plasma structure.

Working group Secondary radiation generation & applications

Primary authors

Prof. Chih-Hao Pai (Department of Engineering Physics, Tsinghua University, Beijing, China) Dr Zan Nie (Department of Engineering Physics, Tsinghua University, Beijing, China) Mr Jie Zhang (Department of Engineering Physics, Tsinghua University, Beijing, China) Mr Xiaonan Ning (Department of Engineering Physics, Tsinghua University, Beijing, China) Dr Zhang Chaojie (University of California Los Angeles, Los Angeles, California, USA) Prof. Jianfei Hua (Tsinghua University) Prof. Wei Lu (Tsinghua University) Prof. Hsu-Hsin Chu (Department of Physics, National Central University, Jhongli, Taiwan) Prof. Jyhpyng Wang (Department of Physics, National Central University; Institute of Atomic and Molecular Sciences, Academia Sinica, Taiwan; Department of Physics, National Taiwan University, Taiwan) Prof. Mori Warren (University of California Los Angeles, Los Angeles, California, USA) Chandrashekhar Joshi (UCLA)

Presentation Materials