Universal Laser Systems Laser Platform M-300 Guía para resolver problemas descargar pdf (Pagina 24)

3-4 System Operation

The CO2 laser beam exits the Laser Cartridge through its output optics, reflects off the #1

Mirror, passes through the Beam Window, reflects off the #2 and #3 Mirrors, to finally pass

through the Focus Lens. The #2 and #3 Mirrors and the Focus Lens are all mounted to the

Motion System. The width of the laser beam as it exits the tube, called the “Beam Diameter”, is

about 4 mm in diameter. The Focus Lens focuses the beam into a very small spot whose “Spot

Size” is dependent on the “Focal Length” of the lens. The “Focal Length” is the distance from

about the center of the lens to the point where it converges the beam into the smallest spot

possible. Using a standard 2-inch focal length lens, the spot size produced is approximately

.005 inches.

The “Focal Range” of the lens, where the beam is considered to be “in focus”, is equivalent to

+/- 5% of the Focal Length, above and below the focus point. Shorter lenses produce a smaller

spot size which gives the laser beam a higher power density (higher power density = hotter

spot), but also results in a very narrow focal range. This means that you could engrave higher

detailed images using less laser power but you would be limited to engraving only very flat

materials. Bumpy or uneven materials could come out of focus quickly if their highest or lowest

points of elevation exceeded the Focal Range of the lens being used. The longer lenses have a

much wider Focal Range, allowing you to engrave bumpy, uneven, or slightly arched objects,

but also produce a larger spot size, which reduces power density, and would prohibit the

engraving of fine detail. This can be related to trying to write small text with a wide, felt tip

marker. Since there are pros and cons to the characteristics of the different Focal Length

lenses, you must choose the right lens for your particular application.

The laser system is equipped with the 2.0-inch Focal Length lens because we consider this lens

the most “Universal“ lens available for CO2 lasers. It creates a nominal spot size of around .005

inches (.13 mm) which gives it good power density with a good Focal Range of +/- .1 inches

(2.6 mm). There are other lens kits available at additional cost.

FOCAL LENGTH SPOT SIZE FOCAL RANGE STANDARD/OPTIONAL

1.5 “ (38.1mm) .003 “ (.08 mm) +/- .075 “ (2 mm) OPTIONAL

2.0 “ (50.8 mm) .005 “ (.13 mm) +/- .100 “ (2.6 mm) STANDARD

2.5 “ (63.5 mm) .007 “ (.18 mm) +/- .125 “ (3.2 mm) OPTIONAL

The term “Wattage” signifies the amount of heat energy that the laser light is producing

measured over a period of time. Laser beam wattage is measured with a laser power meter.

Do not confuse the electrical wattage rating of a light bulb or a hair dryer with the wattage rating

of the laser system.

Over a period of time that can range anywhere from 1 to 10 years, the CO2 gas mixture inside

of the laser tube will start to change in composition. This will cause a gradual decrease in

maximum laser output wattage. This is a normal characteristic of sealed CO2 laser cartridges.

It may be necessary to compensate for decreased power by adjusting your Printer Driver

settings by either increasing the “Power” setting or reducing the “Speed” setting slightly. If the

amount of compensation should become unbearable or unproductive, it may be necessary to

change the Laser Cartridge with a remanufactured one.

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Universal Laser Systems Laser Platform M-300 Guía para resolver problemas Pagina 24