Efficient high-order harmonic generation in a two-color laser field |
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Authors: | I.J. Kim H.T. Kim C.M. Kim J.J. Park Y.S. Lee K.-H. Hong C.H. Nam |
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Affiliation: | (1) Department of Physics and Coherent X-ray Research Center, KAIST, 305-701 Daejeon, Korea |
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Abstract: | We report efficient high-order harmonic generation achieved using a two-color laser field. By inserting a second-harmonic generation crystal in the path of a converging laser pulse, the overall efficiency for high-harmonic generation was enhanced by more than an order of magnitude. In addition, even-order harmonics were also generated. The 2(2n+1)th -order harmonics were very strong and, in particular, the 38th harmonic (21.6 nm), obtained with a single laser shot of 2 mJ, saturated the X-ray charge-coupled device (CCD) of an extreme-ultraviolet spectrometer even with an Al filter of 1.5 m thickness installed in front of the CCD. PACS 42.65.Ky; 32.80.-t; 42.65.Re |
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