Spectroscopic properties and energy transfer process in Er~(3+) doped ZrF_4-based fluoride glass for 2.7 μm laser materials

摘要

Intense 2.7 urn emission from Er~(3+) doped in a new type of ZrF_4-based fluoride glass is reported. 2.7 urn emission characteristics and energy transfer process upon excitation of a conventional 980 nm laser diode are investigated. Based on the absorption spectra, the Judd-Ofelt parameters and radiative properties were calculated and compared with those of other glass hosts. The prepared glass possesses higher predicted spontaneous transition probability (29.04 s~(-1)) along with larger calculated emission cross section (9.16×10~(-21)cm~2). Besides, the energy transfer coefficient of laser upper level (~4I_11/2) can reach as high as 6.56×10~(39-)cm~6/s. Hence, these results indicate that this Er~(3+) doped ZrF_4-based fluoride glass has potential applications in 2.7 nm laser.