Introduction
Welcome to the user manual for your LASER TREE K40 40W Optical Power Laser Module. This manual provides essential information for the safe and efficient operation, setup, maintenance, and troubleshooting of your laser module. Please read this manual thoroughly before use to ensure proper handling and to maximize the lifespan and performance of your device.
Safety Information
General Safety Precautions
- This is a Class 4 laser product. Direct exposure to the laser beam can cause severe eye and skin damage.
- Always wear appropriate laser safety goggles (OD6+) when operating the laser module.
- Ensure the work area is well-ventilated to dissipate fumes generated during cutting or engraving.
- Never leave the laser module unattended during operation.
- Keep children and pets away from the operating area.
- Do not operate the laser near flammable materials.
- The module is equipped with an orange protective glass cover for eye protection.
Temperature Alarm
The laser module features a temperature display and alarm function. If the working temperature exceeds 55°C, an audible alarm will sound. This indicates an elevated temperature that could affect the module's lifespan and performance. Press the reset button to silence the alarm. Allow the module to cool down if the alarm persists.

Image: The laser module displaying its working temperature and the location of the alarm reset button. An alarm sounds if the temperature exceeds 55°C.
Package Contents
Verify that all items listed below are included in your package:
- LASER TREE K40 40W Optical Power Laser Module
- Driver Adapter & 30cm Input Cable
- Spare Protective Lens
- Sliding Plate
- Adjusting Screws M4*20 (2 pcs)
- Air Tube (Φ8*5mm)
- 24V8A Power Adapter
- Power Cable
- 60cm Adapter Cable
- 2.5mm Flat Screwdriver
- 2mm L-wrench

Image: A visual representation of all components included in the LT-K40-EU package.
Setup
Installation
The laser module features an integrated dovetail guide rail, 115mm in length, allowing for smooth movement and easy adjustment of height and focus position. To ensure compatibility with various laser engraving machines, the K40 provides a sliding plate solution with multiple holes for installation flexibility.

Image: Illustration of the laser module's easy installation mechanism, highlighting the sliding plate and height adjustment.
Connecting the Module
- Connect the driver adapter and 30cm input cable to your laser machine's control board.
- Attach the 60cm adapter cable to the laser module.
- Connect the 24V8A power adapter and power cable to the module.
- Ensure all connections are secure before powering on.
Operating Instructions
Powering On and Indicator Lights
The LASER TREE K40+ laser engraving module has two indicator lights: a red light for power and a green light for the PWM signal. When both lights are illuminated simultaneously, it indicates that the module is functioning correctly. The red cross positioning light at the bottom will also be active.

Image: A detailed view of the laser module, pointing out the power indicator, signal indicator, air assist port, and fixed focus lever.
Focus Adjustment
A focus lever is designed on the lower side of the laser module to adjust the focal distance based on the material thickness. For example, to cut 12mm material, the focus should be 6mm lower than the material surface. Adjust the fixed focus lever to 6mm.

Image: A guide showing the fixed focus lever and a reference table for adjusting focus based on material thickness.
| Material Thickness | Fixed Focus Lever Setting |
|---|---|
| < 5mm | 0mm |
| 5mm | 2mm |
| 8mm | 4mm |
| 10mm | 5mm |
| 12mm | 6mm |
| ≥15mm | 7mm |
Red Cross Line Positioning
The red cross positioning light located at the bottom of the laser head helps to accurately position the laser module, ensuring precise alignment for your engraving or cutting tasks.

Image: A visual comparison demonstrating the accuracy gained by using the red cross line for material positioning.
Cutting and Engraving Capabilities
The LASER TREE 40W optical power laser module offers powerful cutting capabilities. It can cut 20mm plywood in a single pass at 150mm/min with 100% power. At the same settings, it can cut 15mm acrylic in a single pass. This 40W laser head is suitable for cutting plywood, pine, acrylic, basswood, 0.5mm stainless steel, and other materials.

Image: Visual examples demonstrating the maximum thickness of various materials that can be cut in a single pass, including pine plywood, bass plywood, MDF, and black acrylic.
The module also offers super fast engraving speeds, reaching up to 20000mm/min.

Image: A comparison highlighting the superior engraving speed of the LASER TREE K40 module.
Maintenance
Cooling System
The LASER TREE 40W module features a dual-fan cooling system, providing excellent cooling performance. Two fans work simultaneously to enhance the laser module's lifespan and prevent power degradation. It also includes a built-in air assist airway to achieve clean-cut edges and improve cutting performance.

Image: An exploded view illustrating the dual-fan cooling system and the integrated air assist airway within the laser module.
Protective Lens Replacement
The module features an easy-to-change window design, making it simple to clean and replace the protective lens if it becomes contaminated or dusty. Regular cleaning ensures optimal laser performance and longevity.

Image: Illustration demonstrating the process of changing the protective lens, highlighting the focus lens and protective lens core.
Troubleshooting
Temperature Alarm
If the temperature alarm sounds (module temperature exceeds 55°C), press the reset button to silence it. Allow the module to cool down. Ensure adequate ventilation and check for any obstructions to the cooling fans.
Laser Not Firing or Weak Output
- Check if both the red power indicator and green PWM signal indicator lights are on.
- Verify all cables are securely connected.
- Ensure the power adapter is correctly plugged in and receiving power.
- Clean the protective lens if it appears dirty or dusty.
- Adjust the focus according to the material thickness using the focus lever.
Inaccurate Positioning
- Ensure the red cross positioning light is active and properly aligned with your material.
- Check the stability of your laser machine and the module's mounting.
General Issues
If you encounter issues not covered here, please refer to the support section for contact information.
Specifications
| Feature | Detail |
|---|---|
| Brand | LASER TREE |
| Model | K40 |
| Optical Power Output | 40W+ (Built-in 8pcs 5.5W beam compressed laser diodes) |
| Laser Class | Class 4 |
| Input Voltage | 24V |
| Cooling System | Dual Fan Cooling |
| Air Assist | Built-in Air Assist Airway |
| Temperature Monitoring | Digital Display with Over-temperature Alarm (>55°C) |
| Positioning Aid | Red Cross Line Locating Light |
| Eye Protection | Orange Protective Glass Cover |
| Package Dimensions | 27.6 x 21.5 x 11 cm |
| Weight | 2.29 kg |
| ASIN | B0CL6QB1YD |
Warranty and Support
Warranty Information
Information regarding specific warranty terms is not available in the provided product details. Please refer to your purchase documentation or contact the seller for warranty details.
Customer Support
For any questions before or after your purchase, or if you are unsure about the compatibility of this laser module with your machine, please contact the seller directly through the Amazon messaging system. The seller aims to respond and resolve issues promptly.
Procedure to contact seller:
- Log in to your Amazon account.
- Navigate to your orders.
- Click on the corresponding order number for this product.
- Select the option to contact the seller.
Additional Information
Example Projects
The LASER TREE K40 module is capable of a wide range of engraving and cutting projects on various materials, including wood, acrylic, and metal.

Image: Examples of intricate designs and patterns created using laser engraving technology on different materials.