Author Affiliations

Hendrik Kumiawan,¹ Anung Kusnowo,^1,* Maria Suliyanti,^1,* Sadao Nakajima,^1,** Kiichiro Kagawa,^1,† and Takao Kobayashi^1,††

¹Spectroscopy Laboratory, Graduate Program for Opto-electronics and Laser Application, University of Indonesia, Jakarta 10430, Indonesia.

^*Institute of Applied Physics, Indonesia Institute of Sciences, Serpong, Indonesia

^**New Glass Res. Center, Nishinomiya 663, Japan

^†Department of Physics, Faculty of Education, Fukui University, Fukui 910, Japan

^††Department of Electrical & Electronic Engineering, Faculty of Engineering, Fukui University, Fukui 910, Japan.