Maciel, G. S.Rakov, N.Araújo, Cid B. deMessaddeq, Younes [UNESP]2014-05-272014-05-271999-11-01Journal of the Optical Society of America B: Optical Physics, v. 16, n. 11, p. 1995-1998, 1999.0740-3224http://hdl.handle.net/11449/65879Nonlinear absorption and amplification of a probe laser beam can be controlled by adjustment of the intensity-modulation frequency and the wavelength of a pump laser beam. A demonstration of this effect in Er3+-doped fluoroindate glass is presented. The results show maximum amplification of the probe beam (∼12%) when a pump laser emitting 16 mW of power is modulated at ∼30 Hz. In the limit of low modulation frequencies, or cw pumping, induced absorption of the probe beam is the dominant nonlinear process. © 1999 Optical Society of America.1995-1998engArtigo10.1364/JOSAB.16.001995Acesso aberto2-s2.0-00127415992-s2.0-0012741599.pdf2998503841917815