Published in:
Journal of Optics a-Pure and Applied Optics 5,6 (2003) S514-S517;
Link to original published article:
http://dx.doi.org/10.1088/1464-4258/5/6/019
Abstract
We measure the absorption coefficient and refractive index changes produced in photorefractive quantum wells of GaAs by using a high-sensitivity periodically phase-modulated two-wave mixing technique. The technique allows us to measure both the amplitude and phase of the refractive and absorption index changes simultaneously. Thus, there is no necessity to use the Kramers-Kronig relation when either the absorption or refractive index is known. We also measure the response time of the grating 2 formation in the frequency domain, yielding similar to15 mus at I-0 = 11 mW cm(-2), which shows that quantum wells of GaAs are one of the fastest materials for dynamic holography.
Keywords
quantum wells;; photorefractivity;; dynamic holography;; nonlinear optics;; gratings;; geometry
Date of this Version
January 2003