The K976FN1RN-200.0W is a high-power fiber-coupled laser diode delivering 200W of Continuous Wave (CW) output power at a center wavelength of 976nm (973nm–979nm). Engineered for fiber laser pumping and material processing, this laser diode operates at the peak absorption band of Ytterbium-doped double-clad gain fiber, enabling efficient pump-to-signal energy conversion in high-power fiber laser and amplifier systems. A standout feature of this laser diode is its exceptional long-term reliability, rated at a Mean Time To Failure (MTTF) of 100,000 hours. This industry-leading lifetime figure — backed by rigorous inspection and burn-in procedures — makes the K976FN1RN-200.0W a trusted choice for OEM integrators where system uptime and maintenance intervals are critical. The integrated 30dB back-reflection isolation across the 1040nm–1200nm range further safeguards the diode from feedback damage in reflective fiber laser environments. The module outputs through a 200μm core diameter fiber (0.22 NA) with a 1-meter pigtail enclosed in 320μm buffer tubing, with a minimum bending radius of 66mm. With a typical electrical-to-optical efficiency of 48%, slope efficiency of 17.5 W/A, and ≥90% of output power concentrated within 0.17 NA, this compact air-cooled laser diode delivers high-brightness pump output for a wide range of industrial and scientific laser applications.