Device for monitoring of alignment of two optical paths and laser designation system equipped with such a monitoring device

A target designation system using laser guidance, comprising:

• an optical head for orientation of an aiming line including at least one a focal device for a laser path and an infrared path and an optical bench including:
• a thermal camera;
• a laser source
• an alignment monitoring device of two optical paths including a laser beam aiming path and an infrared imaging path, comprising:
• means for converting the laser beam into an infrared beam parallel to the laser beam;
• means for aligning the infrared imaging path on the converted infrared beam resulting from the conversion;
• an optical housing containing the means for converting and including:
• a cassette containing a polyimide film in a strip associated with an optical assembly for focusing the laser beam and the collimation of the infrared beam resulting from conversion by the means for converting;
• wherein said alignment monitoring device is arranged between the optical head and the optical bench in such a way so as to convert a laser beam FL, originating from the afocal device, into an infrared beam FI with an axis rigorously parallel or coincident with that of the laser beam FL and transmitted to the afocal device when the optical head is rotated.