  We predict a new physical mechanism explaining the electron spin precession
frequency focusing effect observed recently in singly charged quantum dots
exposed to a periodic train of resonant circularly polarized short optical
pulses [A. Greilich et al, Science 317, 1896 (2007), Ref. 1]. We show that
electron spin precession in an external magnetic field and a field of nuclei
creates a Knight field oscillating at the frequency of nuclear spin resonance.
This field drives the projection of the nuclear spin onto magnetic field to the
value that makes the electron spin precession frequency a multiple of the train
cyclic repetition frequency, which is the condition at which the Knight field
vanishes.
