SYSTEMS FOR AND METHOD OF LASER MARKING WITH REDUCED MAXIMUM OPERATIONAL OUTPUT POWER

摘要

A system and methods for laser marking a substrate includes a multi-emitter array 16 for directing radiation onto a substrate. The multi-emitter array has a number of discrete emission channels 20 with emitting ends 20a. Each emission channel is coupled at its opposing end with two or more laser diodes 18a, 18b. The laser diodes are operated at a maximum operational output power Pop below their rated maximum power P. The emission channels are preferably optical fibres. The system is suitable for inkless printing on substrates susceptible to colour change when irradiated such asa substrate coated with a TAG leuco dye or AOM .