INDUSTRIAL MANUFACTURING PROCESS
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| Principle of Laser | Special Properties | Generating System | Standard of Laser |
| Application |
• A laser medium ¡V a medium in which stimulated emission of radiation occurs.
• An external energy source ¡V an energy source for pumping energy into the laser medium to produce stimulated emission of radiation. This source can either be thermal, electric or radiant.
• A lasing cavity ¡V an optical cavity in which two laser mirrors are arranged in precise orientation such that resonance of stimulated emission occurs. One mirror is totally reflective and the other mirror is partially reflective. The laser cavity is also referred to as ¡§ resonator ¡¨.
The laser beam output from the laser head is directed to the operation site by a beam delivery system. Nowadays, there are two main delivery systems.
• Mirror delivery system ¡V Mirrors are mounted and orientated in such a way that the laser beam is directed to the desired location by reflection. An example of the mirror delivery system is the articulated arm commonly used in medical lasers (Fig.10)
• Fibre delivery system ¡V An optical fibre is used to transmit the laser beam by internal reflection.