Investigation of Ce(3+) Dopant in Appropriate Hosts for Blue Green Lasers.
Abstract
Blue green lasers are required for communication under sea water. Preliminary data at ONR had shown that Ce:LaAlO3 offers promise for communication under sea water. LaAlO3 exhibits a phase transformation at 435 C which creates problems in growing high quality crystals. Initial emphasis of the program was on making suitable additions to the LaAlO3 in order to achieve a cubic perovskite structure which eliminates the phase transition. A composition of LaAl0.75Sc0.25O3, was identified as cubic; however, high quality crystals could not be grown because of difficult crystal growth parameters. Two other compositions - (La0.98Ba0.02) (Al0.98Zr0.02)O3 and (LA0.98Sr0.02) (Al0.98Zr0.02)O3 - were also produced with cubic structure. Since Ba containing compound may exhibit quenching of fluorescence, the Sr compound may be useful for solid state laser applications. These bluish-green crystals are not expected to show fluorescence in the blue-green spectral region. In order to develop other crystals with lower melting point, an effort was also placed on Ce:Gd2SiO5, Ce:La2SiO5 and Pr:KMgY3F12. Ce:Gd3Sc2Al3O12 (Ce:GSAG) crystals were also grown. These crystals offer promise for solid state laser applications; however, it is necessary to grow improved quality crystals for evaluation of laser performance.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 25, 1986
- Accession Number
- ADA176362
Entities
People
- Chandra P. Khattak