Optical Maser Emission from Trivalent Preseodymium in Calcium Tungstate

Coherent emission at 1.047 μ 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 the ³P₀, ³P₁, and ³P₂ bands. The emission corresponds to a ¹G₄↠³H₄ transition with the terminal level 377 cm−1 from 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 state ¹G₄ is 50×10−3 sec. A new technique used to measure the lifetime is described. 

 

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