title: Optical gain at 1550 nm from colloidal solution of Er3+-Yb3+ codoped NaYF4 nanocubes.
abstract: We demonstrated optical amplification at 1550 nm with a carbon tetrachloride solution of Er(3+)-Yb(3+) codoped NaYF(4) nanocubes synthesized with solvo-thermal route. Upon excitation with a 980 nm laser diode, the nanocube solution exhibited strong near-infrared emission by the (4)I(13/2)-->(4)I(15/2) transition of Er(3+) ions due to energy transfer from Yb(3+) ions. We obtained the highest optical gain coefficient at 1550 nm of 0.58 cm(-1) for the solution with the pumping power of 200 mW. This colloidal solution might be a promising candidate as a liquid medium for optical amplifier and laser at the optical communication wavelength.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, PR China.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Liu
authors.forename: Yingzhi
authors.initials: Y
authors.lastname: Chi
authors.forename: Guoping
authors.initials: G
authors.lastname: Dong
authors.forename: E
authors.initials: E
authors.lastname: Wu
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Qiao
authors.forename: Heping
authors.initials: H
authors.lastname: Zeng
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu