Herein, an all-solid-state widely tunable Ti:sapphire laser pumped by a home-made 532 nm laser with high power and high conversion efficiency is demonstrated. First, a maximum output power of 37.8 W at 532 nm is obtained by Q-switching and intracavity frequency doubling via a Nd∶YAG crystal that is symmetrically pumped by three 1 kHz laser diode (LD) arrays. The envelope of each LD pulse contains five Q-switched pulses with a duration of 90 ns and repetition rate of 5 kHz. Using the green light to pump the Ti∶sapphire crystal, a 733.5-871.1 nm widely tunable laser is then obtained. The maximum output power at 771 nm is 8.26 W, the optical-optical conversion efficiency is 42%, and the pulse duration is 14 ns. Moreover, the output power stability is superior to ±4.4% within 30 min.