When you ask a Bruce Springsteen enthusiast to write an article about a laser marker with two heads then a comparison with the song "two hearts" springs to mind. With a little adjustment you come to the core of this article.

"Two heads are better than one
Two heads get the job done
Two heads are better than one"
Telesis developed and brought to market the Dual Head Laser Concept with available models from the E- Series (Vanadate Lasers) and the F-series (Fiber Lasers). This concept offers the unique advantage of controlling two independent marking heads with a single INTERFACE integrated controller. Ashot Mesropyan, President of Telesis, explains the significant benefits of the 2H laser marking solution using two separate lasers instead of just one.
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Ashot Mesropyan, President of Telesis Technologies, Inc.

Born and raised in Armenia where he got his PhD in laser physics at the YS University. Then he developed laser systems for scientific programs before he moved to the USA to develop the first end diode pumped laser markers
Why use the 2H laser marking systems?
There are several reasons for using the 2H laser marking systems. With two separate laser markers the integrator must externally correlate the start, the stop and many other timing parameters that two separate laser markers require. The integrator also needs to create two wiring channels, one for each marker. In addition, the integrator needs to use two separate computers, two software and create two separate patterns/files for each marker.

With the FQ2H there is no need for an external correlation. Everything is done internally. Telesis has developed the Merlin 2H software for this concept. There is no need to create two separate patterns/files because only one computer and one software is used.

The real benefit for an integration using two laser beams is that it is significantly simpler and cheaper with the 2H setup than with two separate laser markers.

Are those the only benefits?
No. The 2H concept is much less prone to errors. The technology is patented in the US, Europe and Japan. The concept occupies less physical space than two separate markers because you only use one controller and one PC/laptop. As a result the integration into a Class 1 enclosure is easier and cheaper from a size point of view. And obviously the FQ2H is cheaper than the total of two separate laser markers.

Can you explain what kind of applications significantly benefit from the two heads laser concept?
First of all these are the applications which require short marking times that one single laser beam cannot support. It is important to remember that Galvo speed and NOT laser power is the limiting factor in many cases. So simply increasing the single beam power might not help. In the concept of the 2H we can split the marking patterns and mark them at the same time with two laser beams or mark two separate parts at the same time. This will reduce the marking time by up to two times.

On the other hand there are applications which require deep marking during a short marking time that a single laser beam cannot support. If you have an X Watt power single beam laser, the 2H technology allows you to double that power and have a 2X Watt laser marker.

This means that Telesis can offer up to 150W power (2x75W). Currently none of the competitors in the laser segment is offering more than 100W power markers. Telesis therefore can achieve deeper marks that anyone else.
But it is not just depth. Sometimes applications require a tight laser spot size in the focus but a larger marking window than a single head marker can support. The 2H concept makes a marking window two times larger than the marking window of the single head marker.

Could you give us an example of an application where the two head concept is being used?
In Belgium we were part of an innovative project to develop and market a disposable pen for the treatment of warts based on liquefied nitrous oxide. The marking had to take place on a curved surface at a certain angle. Telesis was challenged to mark this pen with a logo, some indicators to identify whether the pen has been activated and additional information such as article number and expiry date. We love a challenge at Telesis and we are proud to be part of these sorts of projects which make a difference.

There are many other applications which benefit from the two head marking concept. There are applications which require marking two different locations or marking different sections of the same part - for example on the opposite sides of the same part. For those applications, XY tables or rotary devices are used. By using the 2H concept we can eliminate XY tables, rotary devices and complicated control software and wiring and make the integration much simpler and cheaper.

Do both laser heads necessarily have to be similar?
Absolutely not! This concept has the ability to combine two laser beams with different powers, different pulse widths or wavelengths into a single marker and makes it easy to operate and to integrate. In addition different lenses can be used. For example with a low power beam for cleaning pass and a high power beam for deep marking, or with a short pulse beam for marking the plastic portion of the part and a long pulse beam for marking the metal portion.

There are also applications which require continuous nonstop operation. The second laser head can be used as a backup in case the first laser gets damaged.

In summary, the 2H concept is cheaper and simpler. It takes less space and takes away the limitations of using only one laser. It can mark deeper, longer, faster, on two different types of material, and one head can be used as a backup in the case the first head gets damaged. The dual headed lasers systems are available with the Vari-Z Internal Focusing laser and the InLine Vision (integrated camera). The MerlinĀ® 2H software is user friendly, compatible with a PC or a laptop, easy to integrate and can handle .dxf, ai. and .plt files.
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