Skip to main content Accessibility help

Numerical studies on terahertz radiation generated from two-color laser pulse interaction with gas targets

  • H.W. Du (a1), M. Chen (a2), Z.M. Sheng (a1) (a3) (a4) and J. Zhang (a1) (a3)


Based upon the Ammosov-Delone-Krainov ionization model, it is shown that two-color laser interaction with neutral gas generates strong ionization currents, which lead to electromagnetic emission at terahertz frequency when the gas density is at proper values. The emission efficiency depends on the difference of the phases between the fundamental and its second harmonic. The intensity ratio between the two pulses also affects the emission strength. An optimum intensity ratio has been found within our parameter region. The above ionization current theory is in agreement with one-dimensional particle-in-cell simulations with field ionization included.


Corresponding author

Address correspondence and reprint requests to: Z. M. Sheng, Department of Physics, Shanghai JiaoTong University, Shanghai 200240, China. E-mail:


Hide All
Amico, C.D., Houard, A., Franco, M., Prade, B. & Mysyrowicz, A. (2007). Conical forward THz emission from femtosecond-laser-beam filamentation in air. Phys. Rev. Lett. 98, 235002.
Augst, S., Strickland, D., Meyerhofer, D.D., Chin, S.L. & Eberly, J.H. (1989). Tunneling ionization of noble gases in a high intensity laser field. Phys. Rev. Lett. 63, 22122215.
Bartel, T., Gaal, P., Reimann, K., Woerner, M. & Elsaesser, T. (2005). Generation of single-cycle THz transients with high electric-field amplitudes. Opt. Lett. 30, 28052807.
Chen, M., Pukhov, A., Peng, X.Y. & Willi, O. (2008 a). Theoretical analysis and simulations of strong terahertz radiation from the interaction of ultrashort laser pulses with gases. Phys. Rev. E 78, 046406/1–7
Chen, M., Sheng, Z.M., Zheng, J., Ma, Y.Y. & Zhang, J. (2008 b). Developments and applications of multi-dimensional particle-in-cell codes in the investigation of laser plasma interactions. Chin. J. Comput. Phys. 25, 4350.
Cook, D.J. & Hochstrasser, R.M. (2000). Intense terahertz pulses by four-wave rectification in air. Opt. Lett. 25, 12101212.
Dorranian, D., Ghoranneviss, M., Starodubtsev, M., Yugami, N. & Nishida, Y. (2005). Microwave emission from TW-100fs laser irradiation of gas jet. Laser Part. Beams, 23, 583596.
Hu, G.Y., Shen, B.F., Lei, A.L., Li, R.X. & Xu, Z.Z. (2010). Transition-Cherenkov radiation of terahertz generated by super-luminous ionization front in femtosecond laser filament. Laser Part. Beams 28, 399407.
Kemp, A.J., Pfund, R.E.W. & Meyer-Ter-Vehn, J. (2004). Modeling ultrafast laser-driven ionization dynamics with Monte Carlo collisional particle-in-cell simulations. Phys. Plasmas 11, 56485657.
Kim, K.Y., Glownia, J.H., Taylor, A.J. & Rodriguez, G. (2007). Terahertz emission from ultrafast ionizing air in symmetry-broken laser fields. Opt. Express 15, 45774584.
Kress, M., Loffler, T., Eden, S., Thomson, M. & Roskos, H. (2004). Terahertz-pulse generation by photoionization of air with laser pulses composed of both fundamental and second-harmonic waves. Opt. Lett. 29, 11201122.
Kress, M., Loffer, T., Thomson, M., Dorner, R., Gimpel, H., Zrost, K., Ergller, T., Moshammer, R., Morgner, U., Ullrich, J. & Roskos, H. (2006). Determination of the carrier-envelope phase of few-cycle laser pulses with terahertz-emission spectroscopy. Nat. Phys. 2, 327330.
Leemans, W.P., Gedddes, C.G.R., Faure, J., Toth, C.S., Tilborg, J., Schroeder, C.B., Esarey, E., Fubiani, G., Auerbach, D., Marcelis, , Carnahan, M.A., Kaindl, R.A., Byrd, J. & Martin, M.C. (2003). Observation of terahertz emission from a laser-plasma accelerated electron bunch crossing a plasma-vacuum boundary. Phys. Rev. Lett., 91, 074802/1–4.
Penetrante, B.M. & Bardsley, J.N. (1991). Residual energy in plasmas produced by intense subpicosecond lasers. Phys. Rev. A 43, 31003116.
Sheng, Z.M., Mima, K., Zhang, J. & Sanuki, H. (2005). Emission of electromagnetic pulses from laser wakefields through linear mode conversion. Phys. Rev. Lett., 94, 095003/1–4.
Sheng, Z.M., Wu, H.C., Wang, W.M., Chen, M., Dong, X.G. & Zheng, J. (2008). Simulation of high power THz emission from laser interaction with tenuous plasma and gas targets. Comm. Comp. Phys. 4, 12581278.
Wu, H.C., Meyter-Ter-Vehn, J. & Sheng, Z.M. (2008). Phase-sensitive terahertz emission from gas targets irradiated by few-cycle laser pulses. New. J. Phys. 10, 043001/1–10.
Wang, W.M., Sheng, Z.M., Wu, H.C., Chen, M., Li, C., Zhang, J. & Mima, K. (2008). Strong terahertz pulse generation by chirped laser pulses in tenuous gases. Opt. Express 16, 1699917007.
Xie, X., Dai, J.M. & Zhang, X.-C. (2006). Coherent control of THz wave generation in ambient air. Phys. Rev. Lett. 96, 075005/1–4.


Related content

Powered by UNSILO

Numerical studies on terahertz radiation generated from two-color laser pulse interaction with gas targets

  • H.W. Du (a1), M. Chen (a2), Z.M. Sheng (a1) (a3) (a4) and J. Zhang (a1) (a3)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.