The electro-optic coefficients of GaAs: Measurements at 1.32 and 1.52 μm and study of their dispersion between 0.9 and 10 μm

Abstract

The linear (r41) and quadratic (R11 and R12) electro-optic coefficients of GaAs have been measured at the wavelengths 1.32 and 1.52 μm using single-mode AlGaAs/GaAs strip-loaded waveguides. The results are r41=−(1.54±0.08)×10−10 cm/V, R11=−(9.3±2.8)×10−17 cm2/V2 and R12=−(5.1±l.9)×10−17 cm2/V2 at 1.32 μm and r41=−(1.50±0.08)×10−10 cm/V, R11=−(3.2±2.3)×10−17 cm2/V2 and R12=−(5.1±2.6)×10−17 cm2/V2 at 1.52 μm. These results, together with those previously measured at different wavelengths, are compared with published theoretical models. The linear electro-optic coefficient r41 is slightly dispersive near the band gap and roughly constant for longer wavelengths, in good agreement with the models. The quadratic electro-optic coefficients drop rapidly with increasing wavelength, in good agreement with a model based on electroabsorption.

Determination of the complex linear electro‐optic coefficient of GaAs and InP

“…d 41 decrease strongly from the E 1 transition towards the band gap. The extrapolation of the real part matches the values below the gap from literature for GaAs [1] and InP [2] well.…”

“…This value is usually measured in transmission by applying an external electric field. The most recent measurements can be found in Ref [1] for GaAs and Ref [2] for InP.…”

Simultaneous generation and detection of ultrashort voltage pulses in low-temperature grown GaAs with below-bandgap laser pulses

“…Most likely this behavior results from a decrease in the EO coefficient in this wavelength range. 17 The product of the two dependences is plotted in Fig. 3͑b͒ ͑triangles͒ and it agrees very well with the wavelength dependence of the amplitude of the measured voltage pulses.…”

Ultralow Drive Voltage Substrate Removed GaAs/AlGaAs Electro-Optic Modulators at 1550 nm

“…These include LEO, QEO, PL, and BF effects. The theory of these effects in GaAs is well documented in [9]- [13]. The index change due to these effects can be written as follows:…”