Abstract
Recently Cr 4+ -doped tunable laser crystals has become one kind of very important laser mediums. Cr 4+ ions on a tetrahedral site is responsible for the near-infrared laser emission. It shows great promise as a very useful and practical laser crystal in many areas. It is also an important way to reach the tunable laser wavelength to 1.55 u which is the minimal dispersion region in optical fibers. In this paper we report some new development on Cr 4+ doped tunable laser crystal which were finished in our lab. Cr 4+ doped forsterite crystal is the first one in this area. By growing this crystal in oxygen atmosphere, considerable amount of Cr 4+ occurs from the oxidation of Cr 3+ . A special technique had been adopted to protect the oxidation of Ir crucible. The second is Cr 4+ -doped YAG crystal, Ca 2+ or Mg 2+ codoped Cr:YAG host crystal has been grown in our lab, sized in 30 X 100 mm with excellent optical quality. We failed to produce Cr 4+ in many host crystal, such as YAP, Al 2 O 3 by oxidizing atmosphere or codoped with Ca 2+ , Mg 2+ .
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