EFFECT OF INJECTION CURRENT ON THE DIELECTRIC-CONSTANT OF AN INBUILT WAVEGUIDE IN TWIN-TRANSVERSE-JUNCTION STRIPE LASERS

An investigation has been made of the role of injected carriers in reducing the effective dielectric constant of the inbuilt waveguide of a (GaAl)As double-heterostructure twin-transverse-junction (t.t.j.) stripe laser fabricated by deep Zn diffusion. The technique employed in this study is the measurement of the spectral shift of each Fabry-Perot mode as a function of drive current. The results show that the injected carriers contribute (Δε)c = −5-92 × 10−2 to the effective dielectric constant of the waveguide at threshold. © 1979, The Institution of Electrical Engineers. All rights reserved.