%P 230-238 %T Field strength scaling in quasi-phase-matching of high-order harmonic generation by low-intensity assisting fields %A Balogh Emeric %A VarjĂş Katalin %J JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B: OPTICAL PHYSICS %R 3023375 %I szte %N 2 %V 33 %D 2016 %L publicatio11768