Selective suppression of high-order harmonics within phase-matched spectral regions

Gavriel Lerner, Tzvi Diskin, Ofer Neufeld, Ofer Kfir, Oren Cohen

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Phase matching in high-harmonic generation leads to enhancement of multiple harmonics. It is sometimes desired to control the spectral structure within the phase-matched spectral region. We propose a scheme for selective suppression of high-order harmonics within the phase-matched spectral region while weakly influencing the other harmonics. The method is based on addition of phase-mismatched segments within a phase-matched medium. We demonstrate the method numerically in two examples. First, we show that one phase-mismatched segment can significantly suppress harmonic orders 9, 15, and 21. Second, we show that two phase-mismatched segments can efficiently suppress circularly polarized harmonics with one helicity over the other when driven by a bi-circular field. The new method may be useful for various applications, including the generation of highly helical bright attosecond pulses.

Original languageEnglish
Pages (from-to)1349-1352
Number of pages4
JournalOptics Letters
Issue number7
StatePublished - 1 Apr 2017
Externally publishedYes


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