Advanced semiconductor lasers

Article Abstract:

Semiconductor lasers are a versatile and important source of coherent radiation for many applications. Research into visible and longer infrared wavelengths has extended the range of wavelengths and improved noise and frequency spectrum properties. Recent developments include very low threshold lasers, high power lasers, laser arrays and short-pulse operation in the femtosecond range. Current research in advanced semiconductor lasers is discussed. Emphasis is placed on highly stable single-wavelength lasers and surface-emitting (SE) lasers for wide-band lightwave communications systems and optical parallel information processing. The potential of quantum-films, quantum-wires and quantum-boxes for application to high performance semiconductor lasers is discussed.

Electrical equipment & supplies, not elsewhere classified, Trends

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Quantum wire lasers

Article Abstract:

Quantum well (QWL) semiconductor lasers provide better performance than conventional heterostructure diode lasers. The introduction of quantum confinement in more than one dimension is expected to further improve semiconductor laser performance. Quantum wire (QWR) and quantum dot (QD) lasers employ quasi one-dimension and zero-dimension carriers. QWR and QD lasers are expected to exhibit extremely low threshold currents, narrower spectral linewidth, reduced temperature sensitivity and higher modulation bandwidth. QWR lasers could be useful in applications utilizing densely-packed laser arrays and monolithic integration of lasers with low power electronics. The development of QWR lasers, approaches for fabricating them and recent demonstrations are discussed.

Technology, Bandwidth, Performance improvement (Computers), Performance Improvement, Bandwidth Technology

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