Two He-Ne lasers in the far field acted as simulated light sources carried out self-pumped phase conjugation in BaTiO3:Ce crystal. By studying the changes of their conjugate intensity, especially the response time differences of their grating build-up with different incident light intensities, it was found that the conjugate light produced by the non-single intensity distribution light in far field can be separated in time sequence. With these specific properties, the problem of how to make the beacon light on a uncooperative target become a light spot used for an adaptive optical system may be dealt with tentatively.