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Technology Stocks : Wolf speed

WOLF 20.32

-1.5%

12:59 PM EST

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To: mauser96 who wrote (1981)	2/10/2000 5:36:00 PM
From: John Walliker	Read Replies (3) of 10713

Lucius, Sorry Guy, I believe you may be incorrect. Not all the light goes out laterally in an LED, or perhaps there is some scattering effect. In an LED the photons of light are emitted in random directions. The optical properties of the semiconductors and the substrate affect which directions deliver useful light to the outside world. In a laser there is stimulated emission of radiation. The light intensity, initially from LED action, builds up between a pair of parallel mirrors (made from the cleaved or etched sides of the die). As photons pass atoms (or molecules) which have been given a higher energy level by the electric field in the laser diode they stimulate the coherent emission of additional photons. Coherent emission means that the wavelength, direction and phase (relative position of peaks and troughs in the electric and magnetic fields of the light) are the same for the stimulating and stimulated photons. Hence the light from a laser does have an inherent dominant direction while that from an LED does not. John

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