Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers, however, has a much narrower spectral linewidth than light emitted from LEDs or phosphors. Therefore it is a common belief that white light produced by a set of lasers of different colors would not be of high enough quality for general illumination. We tested this belief experimentally, and found the opposite to be true. This result paves the way for the use of lasers in solid-state lighting.

Lasermicrochemical reactions for maskless device processing: Surface modifications for selectedarea growth J. Vac. Sci. Technol. A 3, 904 (1985); 10.1116/1.573344 Nonreciprocal lasermicrochemical processing: Spatial resolution limits and demonstration of 0.2μm linewidths Appl.Microfabrication processes based on focused laser-beam activation of surface chemistry are reviewed with an emphasis on the classification of the diverse chemical processes used. Surface reactions are divided according to their method of activation and the material phase most important in the chemical kinetics. Examples of reaction mechanisms and means of confining reaction dimensions are given. New results demonstrating that linewidths for deposition and etching ofSi can be < 0.4 f.-tm are described. The ultimate limits to spatial resolution are explored in terms of an effective coutrast (y*) for laser-microchemical processes. Enhanced diffusive transport, characteristic of laser microreactions, and its effect on ultimate reaction rates are also analyzed.PACS numbers: 42.60. Kg, 82.40.Tc, 82.6S.Jv, J.

Nanosecond resolution optical probe measurements of the growth of surface ripples in pulsed-laser-annealed Ge are reported. The ripples are shown to arise from stimulated scattering of the incident laser light into surface polariton waves at the air/liquid/solid interfaces which form during the optical excitation. These surface waves grow exponentially from spontaneous scattering via feedback involving modulation of the velocity of the liquid/solid interface. The final ripple structure results from the density change on melting coupled with transverse diffusional processes during the regrowth.

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