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Tags: Vertical, Cavity, surface, Emission, Laserssurface Emission, land surface emission gas, usepa surface emission isolation flux chamber, surface emission laser, surface emission display, surface emission coefficient, surface emission displays, landfill gas surface emission survey, surface emission monitor, surface emission monitoring, landfill surface emission monitoring, electron surface emission, dynamics 03 surface emission,
 
 
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Vertical Cavity surface Emission Lasers
Post: #1

Vertical Cavity surface Emission Lasers (VCSEL) are lasers that emit light from their surface in contrast with regular ?edge emittersâ„¢. Also they have got a vertical cavity , as the name suggests, which enables surface emission.?Vixels? , as they are commonly called ,have several superior characteristics compared to their edge emitting counter parts.

VCSEL Semiconductor micro laser diodes which emit light perpendicular to their PN junction in a cylindrical beam vertically from the surface of a fabricated wafer and feature circular low divergence beam

Earliest reported in 1965 by Melngailis
VCSEL was first demonstrated in 1979 at Tokyo Institute of Technology
Epitaxial mirrors for GaAs/ AlGaAs VCSELs
pioneered in 1983

Distributed Bragg Reflection
If layers of alternating semiconductors are stacked periodically , each layer having a thickness
?o n , the reflections from each of the boundaries will be added in phase to produce a large reflectivity
Brag reflection condition
Periodicity of cladding layer is chosen so that
n1d1 + n2d2 = ?o/2
n1 , n2 refractive indices
d1 , d2 thickness of layer
?o free space wavelength of the optical beam
Epitaxial growth of VCSEL
There are two methods
1 . Molecular beam epitaxy ( MBE )
2 . Metal Organic Vapour Phase Epitaxy (MOVPE)
 

Marked Categories : seminar surface emitting lasers,

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