Optical properties semiconductor lasers

Magneto-optical properties of (In,Mn)As and (Ga,Mn)As have been studied in order to elucidate the origin of ferromagnetism as well as to explore the possibility of using these materials as Faraday isolators, suitable for monolithic integration with the existing semiconductor lasers. 

The thrust of research on optical recording media is to achieve high sensitivity and long-term stability simultaneously. Since these are conflicting properties, a compromise between sensitivity and stability is usually made. In the future, the availability of visible semiconductor lasers with high output power will relax the sensitivity requirement. Finally, the recording media should require no further processing steps (Jamberdino, 1981). 

Another important characteristic of semiconductors is their optical absorption properties. The optical properties of semiconductors are crucial to their uses as photovoltaic energy conversion devices, photonic detectors, light-emitting diodes, solid state lasers, and optical switches see Semiconductor Interfaces). Some semiconductors absorb both visible and ultraviolet light, while others only absorb photons in the... 

The physical mechanism by which semiconductor light-emitting diodes (LEDs) emit light is spontaneous recombination of electron-hole pairs and simultaneous emission of photons. The spontaneous emission process is fundamentally different from the stimulated emission process occurring in semiconductor lasers and superluminescent LEDs. The characteristics of spontaneous emission that determine the optical properties of LEDs will be discussed in this section. 

Growth of multilayer periodic Z nS/ZnSe h eterostructures b y m etallorganic c hemical vapor deposition, their optical properties examined by ellipsometry and traditional spectroscopy are described. The results obtained evidence that the structures proposed are promising as efficient Bragg reflectors for blue semiconductor lasers. Reflection coefficient higher than 90% in the blue-green spectral range have been obtained. 

Transparent mesoporous fibers with excellent order and parallel pores and doped by laser dye are prepared with good reliability. Influence of the nature of laser dye on the host - guest interaction is shown. Optical properties of Rhodamine 6G and Coumarine 120 embedded in mesoporous fiber waveguide have demonstrated utility for new laser materials, microphotonic devices or microreactors with increasing thermostability of dye component. The opportunity of preparation of the composite materieils mesoporous fiber / semiconductor is shown. 

The direct modulation property of semiconductor injection lasers is one of their unique characteristics and this feature provides the potential for many scientific and commercial applications. Unlike other solid state and liquid lasers, modulating the injection current can directly control the optical output of the semiconductor laser. 

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