Enhanced room-temperature emission in Cr[sup 4+] ions containing alumino-silicate glasses

Batchelor, C.; Chung, W. J.; Shen, S.; Jha, A.
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4035
Academic Journal
The Bi[SUB2]O[SUB3] modified alumino-silicate glasses, when excited at 800 nm exhibited a broadband emission of Cr[SUP4+] in the range of 1.2 to ∼1.6 μm at room temperature. The mean lifetime of ([SUP1]E - [SUP3]A[SUB2])→[SUP3]T[SUB1] transition in Cr[SUP4+]-doped glass at RT was as long as ∼426 μs, enabling the realization of both tunable lasers and broadband fiber amplifiers. The Cr[SUP4+] emission at RT also showed the dependency on the excitation wavelength and site distribution within the chosen glass host. A photoinduced charge transfer process from the Cr[SUP3+] ion into Cr[SUP4+] ion appears to be responsible for the excitation of Cr[SUP4+].


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