1. INTRODUCTION2. TRANSITION METAL AND LANTHANIDE SERIES LASERS3. PHYSICS OF TRANSITION METAL LASERS4. Cr:Al2O35. Cr:BeAl2O46. Ti:Al2O37. Cr:LiCaAlF6 AND Cr:LiSrAlF68. Cr:GSGG, Cr:YSAG, AND Cr:GSAG9. Co:MgF2, Ni:MgF2, AND V:MgF210. WAVELENGTH CONTROL METHODS