Control of molecular orientation with combined near-single-cycle THz and optimally designed non-resonant laser pulses: Carrier-envelope phase effects

Abstract

Molecular orientation with combinations of near-single-cycle THz and non-resonant laser pulses is studied by means of optimal control simulation with CO molecules at 5K. We optimize non-resonant laser pulses with optimally determined final times while assuming fixed THz pulses and focusing on the carrier-envelope phase (CEP) effects. Although almost the same high degrees of orientation are achieved by the combined control independent of CEPs, the structures of the optimal non-resonant laser pulses considerably depend on CEPs and the central frequencies of the THz pulses. From a practical viewpoint, simplified treatments are also discussed.