SLH – 2000 engraving laser head

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Product Description

This is a medium power (2 W) mini engraving laser head with a small professional driver.

Its aluminium body assures proper heat transfer to other metal parts which cool the laser head. The driver used in the laser head is in the open frame version which allows the user to mount it directly on metal parts (proper silicone pads are included).

The laser head allows to cut or engrave materials such as wood, paper, leather, cardboard and many other. Thanks to full analog modulation it is possible to engrave in shades of grey or change the output power during turns. High speed modulation (up to 100 kHz) allows to use high movement speed during engraving even complicated patterns.

Module uses a brand new 1,6W (capable of 2W) 445 nm laser diode.

Using collimating lens, it is possible to change the beam focus distance.

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Recommendations and requirements

It is recommended to monitor and assure proper cooling for the MOSFET transistor.The MOSFET must be isolated from the heatsink/plate with silicon pad as well as plastic sleeve (included). Short circuit between MOSFET and heatsink/plate can damage the driver and can be dangerous for the Laser Diode.
Mosfet temperature should be monitored and it can not exceed 70 degrees Celsius.

Air flow is very important during the engraving process since it is blowing out dark smoke which can cause optical obstacle for a laser beam.

Caution:

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 – 480nm in order to avoid reflected radiation.
Never point laser head at people or animals.
Do not touch the beam, it may cause burns.
Do not stare at the beam or the beam spot while the material is being cut.

Protection

The analog input is protected by a 5V1 Zener diode. On occasion, there may appear the voltage higher than 5V. Despite everything, this input should not be used with higher voltages.

The output of the driver is protected by a Shottky diode which does not allow the reverse voltage to appear.

Technical Data

Wavelength (nm) 445
Modulation frequency (kHz) Max 100
Modulation voltage range (V) 0 – 5
Modulation type Analog/TTL
Input Voltage (V) 6 – 12
Focus distance Adjustable
Output optical power at 20*C(W) 2
Max operating temperature 45*C
Recommended PSU 7,5 V min 2,5 A

Connection of  the engraving laser head

Modulation inputs can be used as TTL inputs with their logic levels of 0V and 5V or as an analog input. Analog modulation means that by using 2,5 V on ANG input you get 50% output power, analogically by using 4 V you get 80% output power, etc.

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Recommended power supply: 7,5V 2,5A.   (+VCC and GND)

Note! When power supply is turn on or turn off, the signal ANG must be low.

Power supply pinout

PSU Pinout

Setting the focal length/distance

It is hard to measure the exact distance of  waist of a beam from the laser head. Setting the focus distance should be firstly done by turning the lens and then, after making the lens not move, by using your Z axis in CNC machine. Focus depends on type of lens used and their distance from laser diode. Be careful not to unscrew the lens – the lens can fall down and get dirty/destroyed. For three element lens focus length should be in range between 120 and 40mm. For single element lens it should be in range between 100 and 20mm. Nevertheless accurate focus distance should be set according to the test made with your material.

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