Optimization of FA(II) and FB(II) color-center lasers

We have studied the performance of color-center lasers based on FA(II) and FB(II) centers in KCl and RbCl with the intent of simultaneously maximizing their output power and tuning range. We have achieved a combined tuning range of 2.22–3.64 μm and slope efficiencies as high as 10%. We also find these centers to be totally free of photodegradation effects during laser operation and to be storable without deterioration at temperatures below 0°C.