PLH3D-6W Engraving Laser Head

Category: PLH3D-Series

High-quality engraving laser head for hobbyists. The PLH3D-6W laser head is Opt Lasers’ third generation of affordable laser head for hobbyists. It uses the same high power diode and excellent quality machined aluminum design and controller as XF version but has a simplified cooling system with the fan providing 15 m3/h that is suitable for less demanding tasks.





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Availability: In stock


SKU: 001628

GTIN: 5902693110453


  • $169.00 In stock
    Our Choice

    This docking station is designed to allow PLH3D-6W–Series laser heads to quickly connect or disconnect from machines. Aids easy removal of the laser head when it is not in use. Protects the laser unit from oils, metal particles, and dust. Includes an Aluminium cover that ...

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  • $149.00 In stock
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    The PLH3D-CNC Universal Laser Adapter designed for all types of CNC/3DP machines. Easy and quick connection between laser head and CNC controller. It accepts all CNC control signals.  Everything you need is included!

    SET Add to cart
    In stock
  • $149.00 In stock

    The PLH3D-CNC Adapter for X-Carve is designed to make electrical connections between the laser head and the Inventables™’ X-Carve® machines, easier and quicker. It also increases the safety level of laser operations.

    SET Add to cart
    In stock
  • $149.00 In stock

    This is adapter kit for PLH3D-6W Series Laser Head to Stepcraft CNC machine. Simple and easy connection between PLH3D-6W Series laser head and Stepcraft CNC machine. All necessary parts are included !

    SET Add to cart
    In stock
  • $69.00 In stock

    The PLH3D-CNC Hobby Adapter designed for most of the CNC/3DP machines. Easy and quick connection to almost any type of the CNC controller output connector and any type of signal modulation. Everything you need is included!

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  • $55.00 In stock
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    These laser glasses can help reduce the probability of light entering the user’s eye from a diffusely backscattered laser light. This product is OD 7+ over the range of 190 to 540 nm, blocking deep ultraviolet to green including violet and blue light.

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  • $35.00 In stock
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    This air nozzle quickly interfaces with PLH3D-6W–Series engraving laser heads via magnets and also functions as a 43 mm spindle adapter. It directs the flow to prevent dark smoke from impeding the laser light from reaching the sample. This helps to ensure a consistent cutting ...

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  • $22.00 In stock

    This Mounted Aspheric lens is useful to collimate or focus laser light in the visible wavelength regime. The aspheric design nearly eliminates spherical aberration without needing multiple optical elements. It has a broadband AR coating of 400-700 nm, allowing it to be used ...

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  • $18.00 In stock

    This Mounted Triplet lens can be used to variably focus or collimate the laser light with reduced aberration due to its triplet (three element) design. Its relatively long effective focal length (EFL) of 8 mm allows it to focus laser light to a small spot.

    PCS Add to cart
    In stock

Technical Data

40 x 55 x 69 mm
Focus Distance
20 - 120 mm
Input Voltage
12 - 24 V
Max. Power Consumption
25 W
Modulation Type
Analog / TTL
23 dBA
190 g (6.7 oz.)
Mounting Hole Type
M3 x 0.5 x 4.5 mm
Operating Ambient Temperature
0 - 40°C (32 - 104°F)
Mounting Hole Pattern
4 Holes 24 x 15 mm (0.94 x 0.59 in.)
Modulation Input 1
0 - 5V Analog/TTL/PWM
Modulation Input 2
0 - 24V TTL/PWM
Max. Modulation Bandwidth
30 kHz
Laser Diode Wavelength
450 nm
Laser Diode Optical Power
6 W
Max. Power Density
225 [kW/cm^2]

Product Description

Parts Included in the PLH3D-6W-Hobby laser head

  1. PLH3D-6W laser head
  2. High-speed driver with Analog and PWM/TTL inputs
  3. High-resolution Engraving Lens (Factory-preset)
  4. High-efficiency Engraving Lens
  5. Connector strip for lengthening the wires if needed

Features & Benefits of the PLH3D-6W-Hobby engraving laser head

Affordable high-quality design – forget other a low-cost option when you can have the same outstanding design known from other Opt Lasers products for affordable price and availability of additional accessories and software that improve your productivity.

Cutting and engraving - the PLH3D-6W-Hobby laser head allows to cut and engrave on various materials such as wood, cardboard, rubber, paper, textiles, leather, plastic, balsa, plywood, and many others as well as a mark on stainless steel, titanium and low heat conductance type of steel. For more check Manuals and Articles section.

Factory set lens - the blue laser head is shipped the High-Resolution Triplet lens installed and adjusted to focus at 60.0 mm (measured from the front-face surface of the laser head to engraving plane). This focal distance has a well-optimized focal spot size which is suitable for many engraving and cutting applications. This is the best-optimized focus distance to start with! 

PLH3D-6W laser head factory set focus

Symmetric Beam Offset - In some applications, such as laser engraving wood, it is recommended to defocus the laser by a small amount in order to achieve a symmetrical beam. This can be done by translating the laser forward or backward in the beam propagation direction by the amount shown in the table below. Doing so will allow the laser to engrave with the same line thickness in both the X and Y directions. However, for certain applications, such as engraving metals and cutting, maximizing the power density is more desirable than having a symmetrical beam. In these cases, defocus is not always necessary or recommended for the best performance.

Recommended defocus for specific engraving applications:

Laser Head Model           Symmetric Beam Offset Value
PLH3D-6W-XF                    ±4.4 mm (± 0.173")
PLH3D-6W-Hobby             ±4.4 mm (± 0.173")
PLH3D-6W-μSpot              ±1.8 mm (± 0.070")

For example, The PLH3D-6W-XF engraving laser has a factory-preset focus at 60.0 mm from the front of the laser head. Setting the laser to 64.4 mm or 55.6 mm (+/- 4.4 mm from the focus) will allow the laser head to engrave with the same line thickness in both directions

Input signals versatility - the build-in driver allows accepting a variety of signals 0 - 5 V analog signal and 0 - 5 V, 0 - 10 V or 0 - 24 V for PWM/TTL signal.

Driver built-in inside the laser head - Opt Lasers is the first company who integrated the laser diode driver directly into the laser head. A short connection between the laser diode and a driver ensures better protection for a diode, possibility of high-frequency current modulation as well as eliminates inductance effects during the switch-on.

Accepts a wide range of power supplies - 12 - 24 V, the integrated high-efficiency DC-DC converter is adjusting the input voltage to proper diode compliance voltage. This reduces the amount of heat generated and ensures over-voltage protection.

No additional cooling required - the dedicated shape of the laser heads provides the best possible cooling method for a 6 W laser diode. Many prototypes have been made to find the best solution for cooling the laser diode. The current design allows the laser head to warm up only by 8-10 degrees Celsius after a whole hour of constant work at full power.

Two types of lenses included - The High-Resolution Triplet Lens with lens adjuster has a relatively long effective focal length (EFL) of 8 mm, which allows it to focus laser light to a small spot. All 6 lens surfaces are coated with anti-reflection (AR) coating centered at 450 nm. It is usually preferred for engraving a thinner line, cutting a thicker material due to the reduced convergence and divergence, or when a long distance between the laser head and the plane of the object to be engraved is necessary.

High-Efficiency Mounted Aspheric Lens is designed to obtain as much as possible power from the laser diode. Its short effective focal length (EFL) of 4 mm makes a variety of working distances possible but makes the focus spot almost twice bigger compared to Triplet Lens. This lens should be used for engraving thicker lines on wood or plastic. This type of lens is used without the lens adjuster since they need to be mounted closer to the laser diode. 

Silent fan - provides 15 m3 of air output which is efficient for cooling and smoke removal that keeps the lens clean. Because of its quiet work, it will not disturb your inmate or neighbor. Or your beloved pet.

Compatible with accessories for ease of use - ease of work is very important to us. As well as safety. Many accessories we produce are high quality, made on CNC machine parts which make the work easy and safe. Please check out the accessories we prepared for the PLH3D series. Your productivity and creativity depend on the right tools. 

OEM customization - available for 3D printer and CNC machine manufacturers

Control Inputs and Electrical Connection

The PLH3D-6W-Hobby engraving laser head has two separate controls.

Modulation Input #1 accepts 0 - 5 V or 0-10 V (with additional 4.2 k ohm resistor in series) for analog power modulation

Modulation Input #2 accepts 0 - 5 V, 0 - 10 V or 0 - 24 V for TTL/PWM and turns on the laser when the voltage exceeds 2.5 V. 

Important: Do not connect both Modulation Input 1 and Modulation Input 2 at the same time. Doing so may result in malfunction of the laser head.

10 V Analog Signal input connection (X-Carve, CS-Lab, and other machines)

In order to connect 0-10 V analog signal to the Modulation Input #1 it is needed to add a 4.2 k ohm resistor in series (it is already included in the Universal Power and Connection Adapter or in “Hobby Kit”) :

laser head - 10 V connection

Important: The laser head should be powered from a high-quality power supply without anything else connected. Please note: connecting the laser head to the same power supply unit as a stepper motor or any other high-impedance equipment is not recommended. Doing so may cause damage to the laser diode.

Laser Driver Parameters

High power and high-frequency current laser diode driver

  • Maximum output current capacity: 5 A
  • Typical output current: 3-3.5 A
  • Input voltage 12-24 V
  • Input current max 2 A
  • Integrated microcontroller for temp. measurement and soft start
  • Thermal protection system: 40 °C 1
  • Soft start for diode protection
  • Electrostatic discharge (ESD) protection
  • Reverse voltage protection
  • Overcurrent protection
  • Compact size and 90% efficiency
  • CW Mode and Input Control Mode
  • PWM/TTL and analog inputs
  • Modulation bandwidth 0-30 kHz


1. Thermal protection system that cut off the laser when ambient temperature higher than 40°C.


Opt Lasers is the laser diode drivers manufacturer. Thanks to our experience building over a few years we created a very high-efficiency driver with low power consumption and low heat production. Additionally, it is the fastest designed laser head driver available on the market accepting signals up to 30 kHz. Using 6W laser with high speed is no longer a problem while engraving small details or making small radius turns because the driver is able to read all needed signals.

CNC controllers are able to send modulation signals with great speed so 50 kHz is not a problem to them. This is why a high-speed driver is a must in such a device. The driver is able to read 30 000 instructions every second what creates great precision and resolution in terms of power control. Also, maximum driver current is 6 A so using it with 3 - 4 A value ensures offset and long lifetime of a laser controller.


The PLH3D-6W-Hobby blue laser head incorporates a thermal protection system that protects the laser diode from overheating to maintain its lifetime. The unit is designed to automatically shut off when the ambient temperature exceeds 40°C and laser head is operating at CW mode. The analog input is protected by a 5 V Zener diode in a case on occasion there appears the voltage higher than 5 V. Despite everything, this input should not be used with higher voltages due to a risk of damage. The laser diode is protected via a Schottky diode, which protects it from a reverse voltage and ESD. In addition, the integrated driver is fully covered to protect it from metal chips in a CNC machine environment.

More info about PLH3D-6W-Hobby engraving laser head


The focus distance can be quickly set or changed via the included lens adjuster (no additional tools). The driver of the unit is integrated directly on the laser head.  This greatly increases the maximum modulation frequency and allows longer cables to be used.

Besides the standard functionality, the small beam spot allows the possibility of using this product for rapid PCB prototyping.  This is done by illuminating the copper layer of plates after a photosensitive paste is applied.

Improved Heat Sinking

This lightweight 190 g (6.7 oz) laser head requires no additional cooling. The body acts as a heat sink, and the fan design allows it to function as an air nozzle protecting the lens from smoke, while also cooling the laser head. Performing tests on several prototype designs allowed us to optimize the heat sink’s shape and enable efficient cooling while maintaining the module’s notably small form factor. 

Accessory for Smoke (see accessories)

The laser head allows engraving or cutting of materials such as wood, stainless steel, paper, leather, cardboard, and many others. For materials that generate smoke when engraved or cut, we offer an optional nozzle that is attachable to the front of the unit via magnets built into the laser head (see accessories).


For bulk orders, the PLH3D series can be customized to all customers' needs. We can add customers' logos and all possible additional features. Customization is offered for a 3D printer and CNC manufacturers and distributors. 


Our PLH3D series work with many CNC and 3D printing machines including the models:

  •    Azteeg X3 
  •    CNC Shark 
  •    GeckoDrive 540
  •    Lulzbot 
  •    MakerBot Replicator1 and Clones
  •    MakerBot Thing-O-Matic
  •    MakerGear M2
  •    MakiBOX
  •    Openbuilds – C Beam/OX
  •    PrintRBot Upgrade
  •    Replicator 2 and 2X 
  •    RepRap – Melzi Board
  •    RepRap – RAMPS1.4 
  •    RepRap – RUMBA
  •    Rigidbot
  •    Shapeoko 2
  •    Shapeoko 3
  •    Solidoodle
  •    Stepcraft
  •    Ultimaker 1 & 2
  •    Velleman K8200
  •    X Controller
  •    X-Carve Upgrade
  •    Zen Toolworks

Note that this list is being continuously updated. Please contact us if you have any questions or feedback regarding compatibility.



  • Remember that it is not a toy.
  • Laser radiation is dangerous even when scattered or reflected from any surface.
  • Always use proper protection laser filter on your CNC machine dedicated to 430 - 480 nm in order to avoid reflected radiation.
  • Never point laser head at people or animals.
  • Do not touch the beam, it may cause burns or other injuries. 
  • Do not stare at the beam or the beam spot while the material is being cut.
  • Laser radiation - Avoid eye or skin exposure to direct or scattered radiation. 
  • Class 4 laser product.


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