Theoretical study of beam quality improvement in spatially modulated broad area edge-emitting devices

In the present study we discuss how an introduction of longitudinal-lateral periodic structures on the electrical contact can also help to improve the quality of the amplified beam in broad area (BA) amplifiers or of the generated beam in BA lasers. A considered spatially periodic structure of the electrical contact is such that the longitudinal and lateral periods d_z and d_x are related by the factor Q=2(d_x)²n_b/(d_zλ₀)≈1, where λ₀ and n_b are central wavelength and background refractive index in semiconductor, respectively.