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Title: Terahertz emission from two-plasmon-decay induced transient currents in laser-solid interactions

We have studied the generation of terahertz (THz) radiation via the interaction of intense femtosecond laser pulses with solid targets at a small incidence angle. It is found that preplasma with a moderate density gradient can enhance the emission. We also observe saturation of the THz output with the driving laser energy. We find that THz emission is closely related to the 3/2 harmonics of the driving laser. Particle-in-cell simulations indicate that under the present experimental conditions, the THz emission could be attributed to the transient currents at the plasma-vacuum interface, mainly formed by the two-plasmon-decay instability.
Authors:
;  [1] ; ;  [1] ;  [2] ; ; ; ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [2]
  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  2. (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240 (China)
  3. INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes, Qu├ębec J3X 1S2 (Canada)
  4. SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG (United Kingdom)
  5. (MoE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
  6. Key Laboratory for Laser Plasmas (MoE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240 (China)
Publication Date:
OSTI Identifier:
22493838
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; DECAY INSTABILITY; EMISSION; HARMONICS; INCIDENCE ANGLE; INTERFACES; LASER RADIATION; LASER TARGETS; PLASMA; PLASMA DENSITY; PLASMONS; PULSES; SOLIDS; THZ RANGE