S-band Tm3+-doped tellurite glass microsphere laser via a cascade process

Sasagawa, Kiyotaka; Yonezawa, Zen-o; Iwai, Ryuta; Ohta, Jun; Nunoshita, Masahiro
November 2004
Applied Physics Letters;11/8/2004, Vol. 85 Issue 19, p4325
Academic Journal
We present a Tm3+-doped tellurite glass microsphere laser operating in the S band via a cascade process. The microsphere is fabricated by melting the end of a tellurite glass wire, and the microsphere laser is pumped at 800 nm using a tapered optical fiber. Laser oscillation is observed simultaneously in the S band and the 1.9 μm band. The threshold of lasing in the 1.9 μm band is lower than in the S band, and the quantum efficiency in the 1.9 μm band increases with pump power above the lasing threshold of the S band.


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