Coherent emission at 1.047 &mgr; from trivalent praseodymium in calcium tungstate was observed. This emission coincides with strong infrared fluorescence at the same wavelength and was found to be stimulated mostly by absorption of blue light by the3P0,3P1, and3P2bands. The emission corresponds to a1G4→3H4transition with the terminal level 377 cm−1from the ground state. The oscillation threshold was the same at 4.2°, 20°, and 78°K. No stimulated emission was observed at room temperature. The lifetime of the metastable state1G4is 50×10−3sec. A new technique used to measure the lifetime is described.