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Table 1.2.3
                                                 Cascade Laser Schemes
                          Laser                                               Lasing
                           ion             Cascade transitions           wavelengths  ( m)   Ref.
                                                   5
                                               5
                                         5
                          Ho 3+    5 S  fi   I     I  fi   I 7                1.4, 2.9         194
                                          5 ß
                                     2
                                                6
                                   5 I  fi    I  fi    I 8                    1.2, 3.9         231
                                         5
                                              5
                                     6
                                          7
                                                 4
                                                        4
                                           4
                          Er 3+    4 S 3/2  fi    I 9/2 ß   I 11/2  fi    I 13/2  1.7, 2.7     163
                                           4
                                   4 S 3/2  fi    I 9/2 ß   I 11/2  fi    I 13/2  fi    I 15/2  1.7, 2.7, 1.55  232
                                                        4
                                                 4
                                                               4
                                                     3
                                               3
                                          3
                          Tm 3+    3 H  fi    H 5 ß   F  fi    H 6            1.48, 1.88       115
                                      4
                                                 4
                         fi lasing transition             ß  nonradiative transition
                                                     Further Reading
                         Becker, P. C., Olsson, N. A.,  and  Simpson,  J.  R.,  Erbium-Doped  Fiber  Amplifiers,
                             Academic Press, San Diego (1999).
                         Davey, S. T., Ainslie, B. J., and Wyatt, R., Waveguide Glasses, in Handbook of Laser
                             Science and Technology,  Suppl. 2: Optical Materials, CRC Press, Boca Raton, FL
                             (1995), p. 635.
                         Desurvire, E., Erbium-Doped Fiber Amplifiers, John Wiley & Sons, New York, (1994).
                         Digonnet, M. J. F., Ed., Selected Papers on Rare-Earth-Doped Fiber Laser Sources and
                             Amplifiers, SPIE Milestone Series, Vol. MS37,  SPIE  Optical  Engineering  Press,
                             Bellingham, WA (1992).
                         Digonnet, M. J. F., Ed., Rare Earth Doped Fiber Lasers and Amplifiers, Marcel Dekker,
                             New York (1993).

                         France, P. W., Ed., Optical Fibre Lasers and Amplifiers, Blackie and Sons, Ltd., Glasgow
                             and London (1991).
                         Hall,  D.  W.  and  Weber,  M.  J.,  Glass  Lasers,  in  Handbook  of  Laser  Science  and
                             Technology, Suppl. 1: Lasers, CRC Press, Boca Raton, FL (1991), p. 137.

                         Miniscalco, W. J., Erbium-doped glasses for fiber amplifiers at 1500 nm,  J. Lightwave
                             Techn. 9, 234 (1991).

                         Rapp, C. F., Laser Glasses: Bulk Glasses, in Handbook of Laser Science and Technology,
                             Suppl. 2: Optical Materials, CRC Press, Boca Raton, FL (1995), p. 619.

                         Stokowski, S. E., Glass Lasers, in Handbook of Laser Science and Technology,  Vol. I:
                             Lasers and Masers, CRC Press, Boca Raton, FL (1982), p. 215.

                         Weber, M. J., Science and technology of laser glass, J. Non-Cryst. Solids, 123, 208 (1991).









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