Hardware Reference
In-Depth Information
controls the laser behavior such as voltage, current, pulse width modulator (PWM) duty cycles
and on/off control.
Installation of the LaserSource and the TECSource are fairly straightforward. After unpack-
ing the units, make sure all packing materials have been removed and nothing obscures the
ventilation ports on the side and front of the units. Change the voltage selection to the appro-
priate value and make sure both devices are properly grounded. The devices have vent holes
on the side and front; do not block these vent holes, or overheating may occur, causing dam-
age to the unit. Connect the cables from the TECSource- and the LaserSource-labeled LASER
and TEC to the LaserMount properly. To power up the unit, connect the AC power cord to the
unit, turn the power switch, located on the front panel, to the on (I) position. The unit will dis-
play the model, serial number, and firmware version, go through a quick power-up self-test,
and return to the last-known operating state. In order to achieve the highest level of accur-
acy, the TECSource should be powered on for at least 1 h prior to taking measurements. Once
devices are powered up, it is necessary to enable the External Fan Control on the TECSource
menu options. Make sure the temperature controller current limit is set to a maximum value
of 7.4 A.
As with all lasers, you need to take proper safety precautions with this setup. Below are
some general guidelines, but you should contact the manufacturer and your institution's
safety personnel before you build or operate this system. At your institution, there are prob-
ably rules governing laser safety in detail. At our institution, the LSO needs to be notified of
the purchase of any laser, regardless of the class. Such notification should include the classiic-
ation, media, output power or pulse energy, wavelength, repetition rate (if applicable), special
atachments (frequency doublers, etc.), beam size at the laser aperture, beam divergence and
users. We overcame the requirement to keep the laser in a shielded room by putting in a box
with a safety switch, which does not allow the laser to turn on if the doors are open. To make
this effective, follow this primary rule:
when operating the laser, make sure that the doors to the rig
are closed and that you are wearing laser safety glasses
.
No atempt should be made to place any shiny or glossy object into the laser beam other
than that for which the equipment is specifically designed. Eye protection devices which are
designed for protection against radiation from a specific laser system should be used when
engineering controls are inadequate to eliminate the possibility of potentially hazardous eye
exposure (i.e. whenever levels of accessible emission exceed the appropriate MPE levels). This
generally applies only to Class IIIB and Class IV lasers. All laser-protective eyewear should be
clearly labeled with optical density values and wavelengths for which protection is afforded.
Skin protection can best be achieved through engineering controls. If the potential exists for
damaging skin exposure, particularly for ultraviolet lasers (200-400 nm), then skin covers and
or “sun screen” creams are recommended. Most gloves will provide some protection against
laser radiation. Tightly woven fabrics and opaque gloves provide the best protection. A labor-
atory jacket or coat can provide protection for the arms. For Class IV lasers, consideration
should be given to flame-resistant materials.
The software for this system is all free and open source and includes the following:
directory, /usr/share/inkscape/extensions/ and restart Inkscape.
4. You can also get the template file from Appropedia.
46
To load a sample for a welding experiment, follow these steps:
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