DEVICE FOR PROTECTING FIBRE LINES AGAINST DESTRUCTION BY LASER RADIATION

摘要

The invention relates to laser engineering and fibre optics. The inventive device for protecting fibre lines against the destruction thereof by laser radiation is embodied in the form of the section of a light-guide which comprises the cladding (6) and the core (7) thereof. The position (8) indicates dashed lines which show the position of the field of light-guide mode. The distance between said dashed lines is equal to the diameter (D) of the field of light-guide mode. The position (10) indicates the section of the light-guide having the reduced diameter of a reflecting cladding. Said device operates as follows: a pressure of 10<4> atm. is produced by a high temperature in the core (7) during the propagation of an optical discharge wave. The value of 10<4> is close to the destruction limit of the light-guide material and to the stop of the optical discharge wave. For this reason, the fibre lines are provided with at least one section of the light-guide which has a reduced thickness quartz cladding and undeformed core.