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1. Introduction
This sub-assembly is a high-power engraving laser head with thermal protection and a professional high-speed
driver. Its design ensures that the head doesn’t require any additional cooling. The fan and airflow design make
it perform as a fully customized air nozzle protecting lens from dirt and cooling the laser head. This sub-
assembly takes advantage of a PLHD 3D 6W driver which ensures proper function of the laser head while
protecting the laser diode from overheating.
There is an automatic thermal cutoff where at 45°C the laser head switches off. A turn to adjust collimating lens
allows you to easily change the beam focus distance. Air flow from the fan is designed to keep the lens clean
during operation. You can use two type of lens with our PLH3D laser heads. G2 lenses are popular because of
the efficiency but efficiency is not necessarily the most important parameter. While laser engraving, power
density is more important
– unfortunately G2 lenses do not provide as small beam spot (while focused) as
most three element lenses. The three-element lens though it causes a bigger optical power loss, allows you to
obtain a smaller beam spot. This helps to obtain a higher power density to area ratio, while also giving the
added benefit of a thinner cutting path.
The choice is up to customer’s requirements, since in some situation it is better to use G2 lens and sometimes
three elements lens. This laser head allows you to cut or engrave materials such as rubber, wood, paper,
leather, plastic, cardstock and many other. Thanks to full analog power modulation it is possible to engrave in
shades of grey or change the output power during turns. The same effect can be achieved by using PWM
signal which is fully compatible with PLH3D driver. High speed modulation (up to 100 kHz) allows to use high
movement speed during engraving even complicated patterns.
This module is using our brand new NUBM44 450nm diode (capable of 6W) which is the strongest available on
market blue laser diode. Our recommended power supply units are 12V or 24V with current capacity at least
1.5A (24V PSU), 2.5A (12V PSU).
The lifetime of laser diode given by manufacturer is 10000 hours. There also an optional additional aluminum
holder which allows easy mounting of the engraving laser head onto your gantry of choice that can be
purchased.
