Radiation-Emitting Laser Diode, Method for Choosing Refractive Indices of a Waveguide Layer Sequence for a Radiation-Emitting Laser Diode and Method for Producing a Radiation-Emitting Laser Diode

A radiation-emitting laser diode comprising:

• a waveguide layer sequence comprising:
• an active region configured to generate electromagnetic radiation with a preferred polarization direction;
• a first waveguide layer of a first doping type;
• and
• a second waveguide layer of a second doping type,
• wherein the active region is arranged between the first waveguide layer and the second waveguide layer,
• wherein refractive indices of the waveguide layer sequence form a first effective refractive index for a transverse electric (TE) mode with its electric field oscillating in a first transverse direction and a second effective refractive index for a transverse magnetic (TM) mode with its electric field oscillating in a second transverse direction, and
• wherein an effective refractive index difference of the first effective refractive index and the second effective refractive index is at least 4·10−4.

A method for choosing refractive indices of a waveguide layer sequence for a radiation-emitting laser diode, the method comprising:

• providing initial refractive indices for the waveguide layer sequence comprising an active region for generating electromagnetic radiation, a first waveguide layer of a first doping type, and a second waveguide layer of a second doping type;
• considering a coupling of a transverse electric (TE) mode in a first transverse direction and a transverse magnetic (TM) mode in a second transverse direction in the waveguide layer sequence as a function of the initial refractive indices;
• and
• choosing the refractive indices of the waveguide layer sequence by adjusting the initial refractive indices depending on a threshold value of the coupling.

A radiation-emitting laser diode comprising:

• a waveguide layer sequence comprising:
• an active region configured to generate electromagnetic radiation of a preferred polarization direction;
• a first waveguide layer of a first doping type;
• and
• a second waveguide layer of a second doping type,
• wherein the active region is arranged between the first waveguide layer and the second waveguide layer,
• wherein refractive indices of the waveguide layer sequence form a first effective refractive index for a transverse electric (TE) mode with its electric field oscillating in a first transverse direction and a second effective refractive index for a transverse magnetic (TM) mode with its electric field oscillating in a second transverse direction, and
• wherein an effective refractive index difference of the first effective refractive index and the second effective refractive index is at least 4·10−4 and at most 5·10−3.