Media type: Electronic Conference Proceeding Title: Two-Photon Amplification On Cascade Transitions Contributor: Schlemmer, Hans H.; Frolich, Dieter; Welling, Herbert imprint: SPIE, 1981 Published in: SPIE Proceedings Extent: Language: Not determined DOI: 10.1117/12.958975 ISSN: 0277-786X Origination: Footnote: