Abstract
The nuclear polarization of protons in a Yb-doped yttrium ethyl sulfate crystal is found to invert by simply illuminating the crystal with near-infrared radiation. A nuclear enhancement of −15 is observed at 1.4 K and H = 15 kOe. This novel dynamic polarization effect is apparently caused by optical pumping of the paramagnetic Yb 3+ spin. When the crystal is placed in a high- Q NMR circuit at 60 MHz, maser oscillations are induced by the incident light.
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