A control system for an optical fiber laser power delivery system wherein the system employs a tip assembly for the optical fibers which provide focusing and beam divergence, mechanical protection for the optical fibers, and in addition functions as the source of a condition responsive signal useful...http://www.google.com.hk/patents/US4695697?utm_source=gb-gplus-share專利 US4695697 - Fiber tip monitoring and protection assembly
