The storage of antimatter in an electrically neutral state is one of t
he breakthroughs required to realize antimatter applications. In this
work, use of laser cooling to manipulate the motion of neutral atoms b
y radiative pressure was demonstrated using a commercial laser diode a
nd metastable argon as antimatter simulant. The concept of critical ve
locity was introduced as a criterion for the laser cooling and its imp
ortance was experimentally demonstrated.