Injection Laser:
Theory Semiconductor lasers or laser diodes play a significant part in our everyday lives by providing cheap and compact-size lasers. They consist of complex multi-layer structures requiring nanometer-scale accuracy and an elaborate design. Their theoretical description is significant not only from a fundamental point of view but also to generate new and improved designs. It is popular in all systems that the laser is an inverted carrier density system. The carrier inversion leads to an electromagnetic polarization that drives an electric field 𝐸(𝑡). In most cases, the electric field, confined in a resonator, the properties of that are also influencing factors for laser performance. [9] Gain medium In semiconductor laser theory, the optical gain is in a semiconductor material. The choice of material depends on the desired wavelength and properties, such as modulation speed. It may be a bulk semiconductor, but more often a quantum heterostructure. Pumping may be electrically or opti