Highly Efficient High-Harmonic Generation in an Orthogonally Polarized Two-Color Laser Field
I Jong KimDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaChul Min KimDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaHyung Taek KimDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaGae Hwang LeeDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaYong Soo LeeDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaJu Yun ParkDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaDavid Jaeyun ChoDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, KoreaChang Hee NamDepartment of Physics and Coherent X-Ray Research Center, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
2005en
ABI
Annotatsiya
Highly efficient high-harmonic generation was achieved in helium using a two-color laser field that consisted of the fundamental and the second harmonic fields of a femtosecond Ti:sapphire laser. By applying a high intensity second harmonic, the harmonics generated in the orthogonally polarized two-color field were stronger than those obtained in the fundamental field by more than 2 orders of magnitude, and even stronger than those of the parallel polarization case. A conversion efficiency as high as $5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ was obtained for the 38th harmonic at 21.6 nm. The physical origin of this enhancement was deduced by analyzing the electron behavior in the two-color field.
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