Phase-dependent Cross Sections of Deuteron-Triton Fusion in Dichromatic Intense Fields with High-Frequency Limit

We investigate the influence of strong dichromatic laser fields (i.e., $$1\omega -2\omega $$ and $$1\omega -3\omega $$ ) with high-frequency limit on the cross sections of deuteron-triton (DT) fusion in Kramers-Henneberger (KH) frame. We focus on the transitions of phase-dependent effects depending on a dimensionless quantity $$n_{\mathrm {d}}$$ , which equals the ratio of the quiver oscillation amplitude to the geometrical touching radius of the deuteron and triton as defined in our previous research. Theoretical calculations show that the angle-dependent as well as phase-dependent Coulomb barrier penetrabilities can be enhanced in dichromatic intense fields, and the corresponding angle-averaged penetrabilities and the fusion cross sections increase significantly compared with field-free case. Then, we investigate the effects of the two beams with different intensities. Moreover, we find that there are twice shifts of the peak values for the phase-dependent cross sections with the increase of $$n_{\mathrm {d}}$$ . The reason for the first shift is the angle-dependent effects for sub-barrier fusion, while the second shift is due to the accumulation of over-barrier fusion, these mechanisms are analyzed in detail in this paper.