De Gruyter eBooksThe Stimulated Emission of Er 3+ Ions in CaF2 at λ1 = 8456 A and λ2 = 8548 AYu. K. Voron’ko, Vladimir A. SychugovPublished Dec 31, 1968• 0 citationsPublisherDOI10.1515/9783112496800-047