Criteria for designing V-groove lasers

Abstract

For designing <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</tex> -groove lasers, the influence of the width of current injection <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">w</tex> and the distance <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</tex> of the diffusion front from the active layer is considered. Two laser designs with stable emission properties have been found: the first possibility consists of using a narrow current injection ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">w \approx 3 \mu</tex> m) while, alternatively, a wider current injection ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">w \approx 5...8 \mu</tex> m) can be used if <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</tex> is less than about 0.5 μm, since a built-in antiwaveguide is then formed and this antiwaveguide stabilizes laser emission.