In this study, we irradiated homogeneously aligned films of an azotolane liquid-crystalline polymer with a single
femtosecond (fs) laser pulse. Upon irradiation of the single pulse, the change in ▵n was induced by destruction of due to
destroy the homogeneous alignment of the azotolane moieties was induced. The estimated value of the change in ▵n
was >0.2, and the response time was about 400 ns. When the experiment temperature was below glass transition
temperature, the change in alignment induced by the pulsed irradiation was preserved without a thermal relaxation. On
the other hand, the changed alignment completely recovered to the initial state with an increase in temperature.