Spectroscopy and laser action of Cr3+, Nd3+ codoped crystal with Ca-Gallogermanate structure J. AZKARGORTA, I. IPARRAGUIRRE, R. BALDA, J. FERNÁNDEZ et A. KAMINSKII J. Phys. IV France, 04 C4 (1994) C4-353-C4-356 DOI: 10.1051/jp4:1994484