Two sapphire substrates are tightly bonded through a BaTiAl6O12-glass thin film, by irradiation with a
nanosecond laser.After the laser process,thecompositionoftheglasssealantchanges,duetoin-
corporation ofAl2O3 from theuppersubstrate.Afterannealingofthebondedsamples(950 °C for
30 minutes)crystallinestructuresareobservedbyTEMwhichareattributedtocrystallineBaTiAl6O12.
These crystalstogetherwithAl2O3:Ti centersaretheresponsibleoftheobservedstrongbluelumines-
cence ofthelaserirradiatedregionuponUVexcitation.Thestructuralandopticalcharacterizationsofthe
bonded samplesclarifythelasersolderingprocedureaswellastheoriginoftheluminescence.Bond
qualityandbondstrengthwereevaluatedbyscanningacousticmicroscopy(SAM)andtensiletests,
which resultsinatensilestressofnearly13MPa,whichisanacceptablevalueforglasssealants.