| 摘要 |
PURPOSE:To contrive to prolong the lifetime without causing the deterioration of laser characteristics by depositing a mixture of a dielectric substance and an inactive element on the end surface of a cavity as an end surface protection film. CONSTITUTION:The protection film mixed with Al2O3 as the dielectric substance and Ar as the inactive element is attached on the end surface of a GaAs- GaAlAs series laser. That is, radii of atoms of GaAs respectively are 1.24Angstrom and 1.25Angstrom ; radii of atoms of Al, O, and Si the constituents of the protection films respectively are 1.43Angstrom , 0.61Angstrom , and 1.17Angstrom ; while the inactive gas Ar has a large atomic radius of 1.91Angstrom . The Ga and the As become difficult to move by the presence of atoms having such large atomic radii in the protection film. |
