LPGH system Central to MMI's business is its versatile Laser Heated Pedestal Growth (LHPG) system. This system is used to produce the highest quality sapphire optical fibers. The ability of the system to grow tapered fibers makes possible the fabrication of compact evanescent wave absorption sensors with exceptionally high sensitivity. Likewise, it is used in the fabrication of the monolithic all-crystalline Ultra probe for the OptoTemp 2000 fiber-optic thermometer which has the highest temperature measuring capability among all such devices on the market (US Patent #6,045,259).