We manufacture laser marking and engraving machines for a wide variety of applications. These Laser
Systems for laser engraving and laser marking can increase production rates.
It will save a lot of time and effort if you determine the type of laser you need for your
application before shopping around. This information will lead you through the "mysteries" of lasers to your final
selection. We will not go through the technical theories of how a laser works, but what lasers are used for what
applications. We will determine the proper choices for Marking, Engraving, Cutting, Welding, and Scribing.
There are many types of lasers, each having different characteristics and differing interactions
with various materials. We need to know the lasers output wavelength, average power, peak power, pulse rate, beam
quality, and beam size. It will also help us to understand the conversion efficiency and consumable requirements of
a particular laser to evaluate the operating cost.
The following are the various types of lasers we will be considering for the applications I
The CO2 Laser, with a wavelength of 10,600 nm (nanometers), reacts best with organic materials,
wood, plastic, paper, glass and fabrics but can be used for metal applications at the higher power levels. With
output power levels from 10-Watts to 25-Kilowatts, these lasers can be used for marking, engraving, cutting,
welding and scribing. Metals are very reflective to the wavelength of CO2 Lasers and they do not work well for
marking metals due to the lower power levels required for marking. CO2 Lasers can operate in the continuous wave
(CW) mode or a pulsed mode. However, the peak power in the pulse mode generally never exceeds twice the CW
The latest CO2 lasers, 10-watts to 500-watts are generally glass tube or RF excited diffusion
cooled and sealed units. CO2 lasers are air cooled at low power levels and water cooled at power levels above
60-watts. With the water cooling requirement, a refrigerated water chiller is generally necessary. A CO2 laser is
approximately 10% efficient, so 90% of the input power is dissipated in heat that needs to be removed from the
laser by either air or water cooling, thus further decreasing the wall plug efficiency. At power levels over
500-watts, CO2 lasers need to be provided with a laser make-up gas (the lasing medium) to maintain the output power
level of the laser. This make-up gas is a consumable and adds to the operating cost. The sealed lower power CO2
lasers generally can last 3 to 5 years before needing to be recharged with gas.
The "Q" Switched Nd:YAG or Vanadate Laser with a wavelength of 1,060 nm is best used for marking
and scribing applications. These lasers react well with metals, ceramics, and plastics for marking applications.
The average output power levels of these lasers generally range from 5-watts to 100-watts, and the newer units are
diode pumped (excited) rather than flash lamp pumped. The unique feature of this Nd:YAG laser is the "Q" Switch
which turns the laser beam on and off at frequencies from 1 kHz to 50 kHz. On the off cycle, the diodes continue to
pump energy into the laser crystal so that when the beam is turned on again it releases a very high peak power
pulse in the multi-kilowatt range. This high peak power pulse quickly breaks down the surface of the material being
marked and virtually vaporizes it. These higher power pulses also help in producing a contrasting color when
The Diode Pumped Nd:YAG lasers are generally water cooled via small refrigerated chillers to
maintain laser output power stability and cool the diodes and laser rod. The solid state Nd:YAG or Vanadate laser
rod (crystal) is the lasing medium and will last indefinitely if cared for properly. The laser pumping diodes will
generally last from 10,000 to 20,000 hours before replacement is required. The most frequent maintenance required
is a change of water, water filter, and anti-algae compound in the closed loop refrigerated chiller's water circuit
every 3 months. Laser optics will also have to be cleaned periodically.
The "Q" Switched Nd:YAG and Vanadate lasers can also be frequency doubled to 532 nm (green),
frequency tripled to 355 nm (ultraviolet), and frequency quadrupled to 266 nm (deep ultraviolet). The shorter the
wavelength the smaller the spot size that the laser beam can be focused to. However, for each conversion to a
shorter wavelength, the laser power is significantly decreased and the laser price tag is significantly increased.
These shorter wavelengths are generally needed when processing micro-electronic devices that require the finest
detail or resolution that can be achieved.
The Pulsed Nd:YAG Laser with a wavelength of 1,060 nm is suited to intricate metal welding,
cutting, and drilling applications. The average power level of these lasers range from 15-watts to 600-watts and
are flash lamp pumped. The pulse rates are generally 1 to 25 pulses per second for lasers with power levels up to
50-watts and 1 to 1000 pulses per second for the highest power lasers. The main feature of the Pulsed Nd:YAG laser
is its high energy per pulse which can be up to 80 joules for the highest power laser. This laser functions by
using overlapping precisely controlled laser pulses to control the progression of the cut or weld, and in the case
of drilling several pulses can be delivered in the same location. For cutting and drilling applications, a high
pressure small orifice coaxial gas assist nozzle is used to help remove the molten material from the cut path or
drill hole. In the case of welding, a larger orifice lower pressure coaxial nozzle is used to deliver a blanket of
inert gas cover to the molten weld area to prevent oxidation.
Because the Pulsed Nd:YAG laser uses a broad spectrum flash lamp for laser pumping (excitation), it
is fairly inefficient at converting the electrical input power to laser power. It has an efficiency of
approximately 3%. These lasers are water cooled at the low end via air/water heat exchangers and at the higher
power levels by refrigerated chillers. The flash lamps require changing every 500 to 1000 hours of operation.
Higher maintenance costs are associated with changing flash lamps, aligning and cleaning optics, and maintaining
the water purity in the closed loop chiller systems. All of this said, it is still the only laser that can be used
for certain applications.
The Fiber Laser, with a wavelength of 1,060 nm, is the newest and most efficient and reliable laser
on the block with life times of 50,000 to 100,000 hours. It is diode pumped and has power output levels from
10-watts to 10 plus kilowatts. From 10 to 30-watts, it can be "Q" switched for marking and scribing applications
including plastics. At the higher power CW mode of operation, it can be used very effectively for metal cutting and
welding applications. The beam quality of the Fiber laser is generally much better than other 1,060 nm lasers so it
will process parts faster for any given power level. The laser beam is delivered to the work piece via small
diameter fiber cable with a focusing head so it is very flexible when trying to fit it into tight quarters or
moving the laser beam at high speeds on an X-Y-Z Axis Gantry System. One laser can also share its laser beam with
several workstations by switching the beam from one fiber optic cable to another. Laser Marking Machines are now
the preferred method for marking and coding products.
The Fiber laser has a wall plug efficiency of nearly 30%. This means it will take the least amount
of electrical power to operate for any given power level. Pump diode lifetimes in excess of 100,000 hours are
projected. This is truly a maintenance free laser. Fiber lasers from 10-watts to 100-watts are air cooled and over
100-watts are water cooled. Because of the higher efficiency of the fiber laser, the refrigerated chiller size can
be smaller than other types of lasers operating at similar power levels.
Cutting, Welding, Engraving and Marking capabilities of the several laser types mentioned
1. Low power CO2 lasers are used for marking and engraving wood, plastic, paper, fabric, and other
organic materials. These lasers can also cut paper and wood up to 1/8" thick.
2. High power CO2 lasers are used to cut wood up to 2" thick and steel up to 5/8" thick. They can
also weld steel up to 1/4" thick.
3. "Q" switched Nd:YAG and Vanadate lasers are used for marking and scribing metals, plastics,
ceramics and other dense materials.
4. Pulsed Nd:YAG lasers are used for intricate cutting and welding applications and also used for
hermetically sealing small electronic device enclosures and medical implant devices. They can also be used for the
intricate cutting of blood vessel stents. Other higher power applications include the drilling of cooling holes in
high temperature turbine engine blades and vanes.
5. Low power "Q" Switched Fiber lasers are used for marking metals and plastics. They can also be
used to scribe solar cells and ceramic materials.
6. High power Fiber lasers are used to cut and weld metals. They can cut metals up to 1" thick and
weld metals up to 5/8" thick.
There are many other applications that these lasers can be used for other than the ones listed
above. You should now be prepared to select the laser type you feel would be required for your application. Other
information that will be need is your desired production rate, your part handling preferences, and automation
Please feel free to call us at any time to review your application or answer any questions you may
have. We provide lower cost larger laser systems than Universal Laser, Epilog Laser and Versa Laser.