1. Introduction / F.J. Duarte -- 2. Spectroscopic applications of tunable optical parametric oscillators / B.J. Orr, Y. He, and R.T. White -- 3. Solid-state dye lasers / A. Costela, I. Garca?-Moreno, and R. Sastre -- 4. Tunable lasers based on dye-doped polymer gain media incorporating homogeneous distributions of functional nanoparticles / F.J. Duarte and R.O. James -- 5. Broadly tunable external-cavity semiconductor lasers / F.J. Duarte -- 6. Tunable fiber lasers / T.M. Shay and F.J. Duarte -- 7. Fiber laser overview and medical applications / S. Popov -- 8. Medical applications of dye lasers / A. Costela, I. Garca̕-Moreno, and R. Sastre -- 9. Biological microscopy with ultrashort laser pulses / J.L. Thomas and W. Rudolph -- 10. Pulsed, tunable, monochromatic x-rays : medical and nonmedical applications / F.E. Carroll -- 11. Lithium spectroscopy using tunable diode lasers / I.E. Olivares -- 12. Interferometric imaging / F.J. Duarte -- 13. Multiple-prism arrays and multiple-prism beam expanders : laser optics and scientific applications / F.J. Duarte -- 14. Coherent electrically excited organic semiconductors / F.J. Duarte -- 15. Appendix on optical quantities and conversions of units / F.J. Duarte.