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samenvatting slides photonics
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Samenvatting PhotonicsIntroduction
The cradle of Solid State Electronics
Shockley, Bardeen and Brattain 1947
Moore’s Law: the number of transistors on a chip doubles every 18 months
“Moore” and “More than Moore”
,While electronics is advancing at high speed a “quiet revolution” is happening
LASER *
Light
Amplification by
Stimulated
Emission of
Radiation
* Gordon Gould
lambda = wave length
- Bright
- Directional
- Coherent
- Monochromatic
Characteristics of LASER emission
Basic components of an early laser
,Early day lasers were a physicist’s dream, but an engineer’s nightmare
• Lasers had a pure and tuneable spectrum
• Lasers had unprecedented optical intensity
• But they were unpractical and power hungry
III-V semiconductor materials and epitaxial growth techniques lead to small laser diodes
The lattice constant, or lattice parameter, refers to the physical dimension of unit cells in a
crystal lattice
Today laser diodes come in almost all wavelengths, sizes and powers
, Optical information carriers
DVD ligt in het rood blueray omdat het in de blauwe kleur ligt
I = hole size
lambda = wave length
The first optical telecom links see the light
Attenuation mechanisms in glass
0.2dB/km attenuation
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