The invention discloses an automatic
light beam capturing device, which comprises an
optical antenna connected with an automatic
tracking system. A Brewster window and a
corner reflector are arranged on the emergent light side of the
optical antenna. A focusing lens and a
signal detector are arranged on the reflected light side of the Brewster window. A position-sensitive
detector is arranged on the emergent light side of the Brewster window and is communicated with the automatic
tracking system through a feedback channel. The
light beam capturing method comprises that the
optical antenna injects light signals to the
corner reflector through the Brewster window after the optical antenna focuses the light signals; the
corner reflector reflects the received light signals to the Brewster window, the reflected light is downward projected onto the position-sensitive
detector, the Brewster window reflects partial light to the focusing lens and the light signals are received through the detector; and the position-sensitive detector calculates to obtain the position information of light, the position information is fed back to the automatic
tracking system, and the automatic tracking
system adjusts the transmitting direction and the
pitch angle of the optical antenna. Since the invention combines an ATP with a
signal laser, the invention has the advantages of simple structure, high economy and high feasibility and the device is suitable for ground
atmosphere laser communication systems.