OFS TrueMode Fiber Laser Cavities provide a complete platform with matching internal components that enable delivery of up to 1kW of true single-mode output. The customer is able to select pump diodes of their choice (commercially available or customer's in-house design). The true single-mode design, and its near ideal splice loss capability, provides our customers an optical engine with consistent high optical-to-optical efficiency and beam quality. OFS TrueMode Fiber Laser Cavities are now categorized by performance level: TrueMode-SP and TrueMode-kW. The TrueMode-SP can deliver up to 550W of output power and is designed for use in 500W applications. Providing 8 pump ports, it is designed for use with diodes delivering greater than 100W of pump power. The TrueMode-kW is designed for kW and, when used with our TrueM2 beam combiners, multi-kW applications. With up to 36 pump ports, the TrueMode-kW cavity can be used with diodes delivering greater than 50W of pump power.