Space Solar Power Systems (SSPS) collect solar energy and to ground by converting it into the laser. This system needs a broad absorption spectrum that can effi ciently absorb solar energy. Cr/Nd:YAG is doped with chromium (Cr 3+) as the sensitizer ion and neodymium (Nd 3+) as the activator ion. The sensitizer ion provides effi cient broad-band pump absorption and transfers the excitation energy to the activator ion. This process effects changes the fl uorescence properties of the laser material. This research describes the fl uorescent characteristics of Cr/Nd:YAG ceramic including this energy transfer process.