Monty K. Allen has been named CFO of LightPath Technologies Inc., an Orlando, Fla.-based manufacturer of precision-molded aspheric optics, fiber optic collimators, isolators and advanced manufacturing technologies.   . . .    Medeikon Corp., a privately held developer of optical technology for medical imaging and sensing, opened its corporate office today in Princeton, N.J. Medeikon will license its technology to medical device manufacturers, pharmaceutical companies and other technology companies for applications including diabetes management, intensive care, dermatology, cardiology, gastroenterology, urology, rheumatology and gynecology.   . . .   BAE SYSTEMS was recently awarded a $6 million contract from ATK Integrated Defense Co., of Clearwater, Fla., for the first full-rate production order for the AN/AAR-47(V) missile and laser warning system, which will be installed on more than 3000 US Navy and Air Force helicopters and transport aircraft. Deliveries are scheduled to begin in March 2004. Laser warning technology alerts aircrews to laser-aided or laser-guided threats.