An illustrated dictionary of optoelectronics and photonics: by Safa Kasap, Harry Ruda, Yann Boucher

By Safa Kasap, Harry Ruda, Yann Boucher

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Additional info for An illustrated dictionary of optoelectronics and photonics: Important terms and effects

Example text

Filters typically have a certain resonant frequency υo and a bandwidth ∆υ around υo such that input (incoming) signals within this ∆υ are passed. e. narrow, an individual resonant cavity mode is with respect to the separation of two consecutive modes. For a low loss optical resonator, it is the ratio of mode separation (∆υm) to spectral width (δυm). The narrower the individual mode width and larger the mode separation, the greater is the finesse. Mathematically, the finesse F is defined in terms of the mirror reflectance R as πR1 / 2 F= 1− R Finger electrodes, see photovoltaic devices Fluorescence, see luminescence.

G. both n-type) regions that surrounds the oppositely doped (p-type) base and injects minority carriers into the base when the emitterbase junction is forward biased. Energy of the electron in the crystal, whether in the conduction band (CB) or valence band (VB), depends on its momentum hk through the E-k behavior determined by the solutions to Schrödinger equation for the particular crystal structure (with a particular periodic potential energy). E-k behavior is most conveniently represented graphically through E-k diagrams.

Thus the beam diameter 2w increases as the beam travels along z. A Gaussian beam starts with a finite width 2wo where the wavefronts are parallel and then the beam slowly diverges as the wavefronts curve out during propagation along z. The finite width 2wo where the wavefronts are parallel is called the waist of the beam; wo is the waist radius and 2wo is the spot size. Far away from the source, the beam diameter 2w increases linearly with distance z. y Wave fronts x 2wo O z Beam axis Intensity Gaussian r 2w (a) Wavefronts of a Gaussian light beam.

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