Two-color ionization of hydrogen for frequencies in the 2:3 ratio

Abstract
We present Floquet calculations of the total rate for multiphoton ionization of atomic hydrogen by a coherent superposition of the second and third harmonics of a Nd:YLF (neodymium-doped yttrium-lithium-fluoride) laser field. The total rate depends little on the relative phase of the two fields in the range of intensity considered.