Shown for the first time is the fabricated all-Single crystal Silicon Carbide (SiC) temperature probe and interface assembly designed for extreme environment temperature sensing in a gas turbine test rig. Preliminary probe test results are described regarding SiC chip temporal response, optical beam stability, and near vacuum sealing.Shown for the first time is the fabricated all-Single crystal Silicon Carbide (SiC) temperature probe and interface assembly designed for extreme environment temperature sensing in a gas turbine test rig. Preliminary probe test results are described regarding SiC chip temporal response, optical beam stability, and near vacuum sealing.