The following section will demonstrate the usefulness of sensitization in real systems, assuming dipole-dipole interaction. In particular, it will show how this phenomenon is utilized to both increase the lasing efficiency and decrease the threshold for laser action. It begins with an example of a laser system that is based on a combination of rare-earth and transition-metal ions, namely, a system codoped with Cr 3+ and Tm 3+ as sensitizers or energy donors and Ho 3= as an activator or energy acceptor. This subject was introduced in Chapter 5. A more detailed description that includes laser performance and pumping methods will be given in Chapter 9, which covers the 2-mm laser.
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