Synrad p250, User Manual, Page: 33 / 106

TECHNICAL OVERVIEW PAGE | 33
Technical overview
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Laser design
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RF power supply
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Optical setup
Laser design
Optical resonator
p250 lasers were developed using new technology developed by NOVANTA. This new technology,
based on a hybrid waveguide/unstable resonator design, as shown in the figure below, enables
NOVANTA to economically produce a symmetrical laser beam from a small but powerful laser capable
of operating for many years with virtually no maintenance. P250’s unique extruded aluminum envelope
offers excellent heat transfer, long gas life, and low operating costs in contrast to other laser tube
technologies. Besides being the vessel that maintains the lasing environment, the aluminum tube is also
the structural platform that integrates the laser’s optical, electrical, and cooling components.
Figure 4-1 Hybrid waveguide/unstable resonator design.
The optical resonator, in conjunction with the electrodes and the gas mixture, generates the laser beam.
p250 optical resonators are comprised of three optical elements: a front mirror, a rear mirror, and an
output window. These optical elements are fastened to the tube’s exterior and are exposed to its interior
through holes in the end caps. O-rings are sandwiched between optical elements and the end cap to
form a gas seal and to provide a flexible cushion that allows the slight movement necessary for
alignment. All optical elements are aligned and locked into place by factory technicians before the laser
is shipped.