Laser fire initiating explosive device optical window in double-self-focusing lens structure

The invention relates to a laser fire initiating explosive device optical window in a double-self-focusing lens structure and belongs to the optical window design of laser fire initiating explosive devices. The optical window overcomes the technical defects of the traditional laser fire initiating explosive device optical window in the prior art, the reduction of the laser radiation power density can be avoided, the entrance of proportional reflecting light into a detection optical fiber can also be ensured, and the consistency of the reflectivity of each fire initiating explosive device is improved. The window comprises a laser device, an ignition optical fiber, a detector, a detection optical fiber, a first self-focusing lens and a second self-focusing lens, wherein the laser device is connected with the first self-focusing lens through the ignition optical fiber, the detector is connected with the first self-focusing lens through the detection optical fiber, the first self-focusing lens and the second self-focusing lens are in parallel arrangement, and in addition, optical axes are coaxial. The laser fire initiating explosive device optical window has the advantages that the ignition laser power density is kept, the ignition reliability margin is ensured, in addition, the reflectivity randomness of the optical window is effectively reduced, the quantitative detection of the reflecting light is favorably realized, and the validity of the continuous detection of the optical path is further improved.