Europium doped calcium fluoride is a machinable and alkaline-earth resistant crystal that is suitable for constructing a
calcium or strontium vapor cell. However, its heat capacity, emissivity, and high coefficient of thermal expansion make
it challenging to achieve optically dense calcium vapors for laser spectroscopy on narrow linewidth transitions. We
discuss a low size, weight and power heating package that is under development at the Air Force Research Laboratory.
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