Abstract
Nd3+:Ba2ZnGe2O7 (BZAG) is an attractive diode array pump material due to its long fluorescence lifetime of 340 µs and broad absorption band centered at 804 nm. In addition, the crystal has a broad fluorescence spectra and offers turnability both at 1.05 and 1.34 µm. BZAG possesses the Akerminite crystal structure and the Nd ions substitute into the Ba2+ site with charge compensation. Time-resolved site-selection spectroscopy measurements revealed ten different crystal field sites for Nd3+ in BZAG and showed the presence of strong energy transfer between ions in nonequivalent sites. The laser performance of Nd3+:BZAG rods was studied using a 2-D diode array. The rods were 5 mm in diameter, 11 mm in length, and AR and HR coated at 1054 nm on opposite ends. The pump was close coupled to the polished AR coated rod barrel. An optical slope efficiency of 23% was observed and the round trip (Findlay-Clay) resonator loss was 4.2%.
© 1989 Optical Society of America
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