The 878.6 nm 65 W High Power Fiber Coupled Diode Laser is a premium spectral source designed specifically for the next generation of high-efficiency DPSS (Diode-Pumped Solid-State) systems. By utilizing integrated Volume Bragg Grating (VBG) technology, this module maintains an exceptionally stable 878.6 nm ± 1 nm center wavelength, allowing for “direct-to-upper-level” pumping of Nd-doped crystals. This strategy significantly minimizes the thermal load on the gain medium, enabling higher output power and better beam quality for the entire laser system. Delivering 65 W of stabilized CW output through a high-precision 200 µm fiber core, the K878 series combines industrial reliability with scientific precision. The module features integrated 30 dB feedback isolation, protecting the diode from back-reflections across a broad range (1020 nm–1200 nm). With a robust 48% electrical-to-optical efficiency and industry-standard SMA905 termination, this module provides the technical authority required for advanced laboratory research and high-performance surgical medical platforms.