Electronic Connectors – The Different Features of These Industrial Products
Beam laser marking systems include CO2 or Nd: YAG lasers. The CO2 laser emits a continuous wave output in far infrared (10.6 um wavelength) and the Nd: YAG laser emits in near infrared (1.06 um) in CW or pulse mode (1-50 kHz). The Nd: YAG laser is also unique in its ability to produce extremely short, high -frequency beams when operating in shot mode. For example, a 60 W average output Nd: YAG laser can produce high outputs on the order of 90 kW at a speed of 1 kHz.
The optics offer a simple lens set or a combination of a fixed upcollimator and a flat lens set.
In one case, the laser beam was directed across the working surface through mirrors mounted on two high-speed computerized galvanometers.
Simple lens combinations have the advantage of low cost and low cost of optics used in CO2 lasers. Flatfield lens designs are more expensive, but keep the signal beam in the plane so that the image patterns are consistent throughout the signal field. Flatfield lenses have a shorter focal length, so they produce a higher working surface control density than a simple lens set. Flatfield lens designs have been optimized for precision, high quality applications and are often incorporated into Nd: YAG lasers.
Both designs give the user a choice of lenses
Those determine the diameter of the signal field and the width of the signal line. Longer focal lengths provide greater working area, but have a wider line width, which reduces the electrical power of the working surface. The user must compensate by increasing the laser power and or decreasing the signal speed. The two -lens signal speeds can be placed at all points of the beam path before the heating lens. Instead of lengthening the beam path by 10 feet more, beam extensions are used. In this case, the beam is amplified by the shape to vary as it passes through the second resonator. The optics of fiber delivery are simple and straightforward. Fiber optic component used for laser delivery are typically step-index fibers. This type of fiber consists of an optically uniform core between 200 and 1500 um in diameter, surrounded by a thin cladding which has slightly different optical properties.
There are several options to fiber optic beam delivery.
The first is single-fiber delivery from a single laser. This type of delivery is generally used for a dedicated production process or in development labs where moving the beam delivery to other workstations is infrequent. The choice of a single-fiber delivery is easily justified by its ease of use, ease of integration to workstations, and the capability for upgrading the system with other options in the future. Other reasons for single-fiber delivery are for robotic delivery of the laser beam and other multiaxis systems where conventional delivery would be a nightmare. With fibers, the output housing is mounted on the final-motion component so integration is incredibly economical and simple.
Another fiber delivery option is time sharing,
Whereby all of the laser output can be directed into any one of the several fibers on demand. A single laser with this system can provide laser energy to several different workstations switching among them at up to 40 Hz. These systems are typically used for laser welding at many different workstations, or to deliver the laser beam to separate areas of one large assembly station.
The last option is termed energy sharing. These systems divide the laser output and send the energy into several fibers at the same time. Mirrors skim portions of the beam from the laser and divert them into the input housings for each of the fibers.