AGFA d-lab.3 Digital Compact Lab

Printer
Repair
Laser Module (LA)
The colour laser scanner is used to expose in the
Raster scan digital image data on special laser
paper by means of 3 Laser beams (red, green,
blue).
Main components of the laser tube:
− glass bulb filled with gas
(on the d-lab.3 Argon)
− 2 mirrors
(the front one is partially transparent, the rear
one is opaque)
− H.V. electrodes to ignite (Ionisation) the gas
1 Mirror (rear)
2 High voltage generation + electrode
3 Coupling + mirror (front)
4 Laser beam
5 Discharge
dlabr147
Beam Generation
The electrons are excited by the applied high
voltage to jump to a higher energy level. When
the gas is discharged at the change to a lower
energy level, light photons are generated which hit
the mirrors, are reflected there and hit other
charged atoms. The atoms that are hit release
several light photons and this phenomenon
continues (principle of a chain reaction).
If the light amplifier in the active medium exceeds
the losses of the waves reflected to and fro
between the mirrors, the laser starts oscillating at
a wave length which is characteristic for the laser
material, producing a stationary wave field
between the mirrors. One of the mirrors is faintly
transparent to outcouple the laser beam from the
resonator.
Many laser materials, like Argon, can supply the
amplification for a large number of different light
frequencies. The Argon ion laser of the d-lab.3
produces the blue (458 nm) and green (514 nm)
beams which are available for the colour laser
bundle at the coupling point. The fibre bundle
guides the laser beams into the optical module
where they are separated and focused in bundles
by lens systems.
6.3.58 2001-01-02 /PN 9009 AGFA d-lab.3