All spliced 36.7 W four wave mixing fiber source near 770 nm

High brightness laser sources in the visible and infrared (IR) are desirable for many applications. Four wave mixing (FWM) in photonic crystal fiber (PCF) with Yb-based fiber laser pumps enables generation of wavelengths into the visible with a corresponding idler in the infrared. We demonstrate an all-fiber spliced four-wave mixing source with 36.7 W average power in the 750 - 850 nm spectral band, beam quality M² < 1.3, and an optical-optical conversion efficiency of 45%, based on a custom PCF and mode locked fiber laser pump.