Precision II Operation and Maintenance Manual
3-2
C
996-0255 rev. b
2. Laser heads
General description
Continuum’s Precision II laser series utilizes several basic head models.
They are the 811U-05, -06, -07 & -09 with the flashlamp in the “upper”
position, the 811D-09 with the flashlamp in the “down” position and the
812H and 812V with their flashlamps in the “horizontal” and “vertical”
positions. The laser heads are located on the laser bench and are utilized
as either oscillator or amplifiers.
Each laser head is of modular design incorporating a rod, a flashlamp and
coupling medium. All have linear flashlamps which are in a close
coupled configuration surrounded by a high brilliance magnesium oxide
diffuser. This results in a high pumping efficiency that minimizes thermal
loading and reduces power consumption. These features combine to
create the excellent pumping homogeneity required for producing high
gain, superior quality beams.
Rods
The heads are designed to pump Nd+3 doped YAG. The doping levels
vary from 0.6 to 1.4%. The YAG rod ends have hard dielectric anti-
reflective coating (AR). The rod length for all Precision series heads is
115 mm measured along the optical axis. The diameter of the rod is
designated by the head model number. For example the 811U-06 has a
6 mm diameter rod, the -09 has a 9 mm diameter rod.
Flashlamps
The Precision II series heads are pumped by linear flashlamps. These
lamps have a voltage polarity that must be observed. The anodes of the
flashlamps can be identified by a red marking on the lamp electrode
whereas the cathodes have no markings. The discharge system of the
flashlamps use a negative critically damped pulse (-1.8 kV max) with a
duration of 200 microseconds full width half max (FWHM). The gas in
the flashlamps is xenon with a pressure of 1-3 atmospheres.
Beam height
The 811U-05, -06 and -09 heads are designed for a beam height of 43 mm.
–+
flashlamp
return
neg. HV
red spot
anode
cathode
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