Abstract: A high-efficiency cavity doubling laser according to the invention contains a laser diode, a laser crystal and a non-linear crystal, is characterized in having a first gap between the laser diode and the laser crystal and a second gap between the laser crystal and the non-linear crystal. Therefore, heat created by the laser crystal can be dissipated by the air gaps and cannot be directly conducted to the laser diode and the non-linear crystal. Furthermore, the thermal distortion of the laser crystal can be compensated by adjusting the position of the non-linear crystal, thereby increasing the efficiency of the laser.

Abstract: A laser generating apparatus which includes a laser holder holding a plurality of lenses decorated with different designs, the laser holder being turned with a rotary cap on one end of a barrel, which is mounted within a casing and holds a laser module, and set into one of a series of positions for permitting one particular lens to be retained in alignment with a laser firing hole on the laser module for producing a particular pattern of light spot.

Abstract: A laser sight mounting device including a mounting block, which has a mounting foot at the bottom for fastening to the flash attachment of a camera, a flash attachment at the top for mounting an electronic flash, a longitudinal center through hole, which receives the laser module of a laser sight, a longitudinal mounting groove inside the longitudinal center through hole, and a side screw hole; a first spring plate mounted inside the longitudinal mounting groove; a second spring plate mounted within the flash attachment of the mounting block to hold down the electronic flash; and a tightening up screw threaded into the screw hole to press the first spring plate causing it to hold down the laser module.