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Stimulated emission from PrCl3
1.F. Varsanyi, Appl. Phys. Letters 19, 169 (1971).
2.More detailed energy level Information is contained in Gerhard Dieke, Spectra and Energy Levels of Rare Earth Ions in Crystals (Interscience, New York, 1968), pp. 196–200.
3.This wavelength corresponds to the transition between the first excited state of and
4.The crystal quantum numbers (μ) are explained in Ref. 2, pp. 110–116.
5.Our lifetime measurements are in sharp disagreement with G. Barasch and G. H. Dieke, J. Chem. Phys. 43, 988 (1965).
6.E. Dorman, J. Chem. Phys. 44, 2910 (1966).
7.If the observed ratio of were due to amplification of the spontaneous emission, we would require or a gain of The maximum product consistent with en‐ergy conservation in our case is 31. For laser oscillation,
8.The shape of the pump laser’s beam waist defines a preferred direction for transverse emission. However, the orange and red emissions are polarized π and σ, respectively, and there‐fore tend to “prefer” transverse propagation directions which are respectively perpendicular and parallel to the crystal c axis.
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