HIGH POWER CONVERSION EFFICIENCY AL-FREE DIODE LASERS FOR PUMPING HIGH POWER SOLID STATE LASER SYSTEMS

摘要

Al-free active diode lasers emitting near 970 nm wavelength have been optimized for high electrical-toopticalpower conversion efficiency. There are numerous key contributors such as scattering and absorption losses,band alignment, Joule heating, carrier leakage and below-threshold losses that contribute to power loss mechanisms.We report on improvement from 50% to a record-high 73% power conversion efficiency for a 1 cm bar at 10C,resulting from a multi-pronged approach that has been taken to minimize each of the loss mechanisms as to improvethe overall power conversion efficiency.