A method and apparatus are disclosed for estimating a property of a downhole fluid, the apparatus including but not limited to a carrier that is conveyable in a borehole; a test cell carried by the carrier for capturing the downhole fluid; a rare earth doped electromagnetic energy source in electromagnetic energy communication with the downhole fluid in the test cell; and an electromagnetic energy detector in electromagnetic energy communication with electromagnetic energy emitted by the rare earth doped electromagnetic energy source that has interacted with the fluid for estimating the property of the downhole fluid.
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