Abstract

In order to get blue, green and red laser beam, we applied upconversion process¹⁾. We used Tm³⁺, Ho³⁺ ions which give three energy level lasers. As the difference between emission and absorption peak wavelength is small, the sensitizers were applied to get higher emission intensity. The base glass was fluoro-zirco, aluminate glass(AZF)²⁾, because the phonon energy is small and the chemical durability is excellent.

© 1993 Optical Society of America