Wavelength: 450nm. Modulation: 0/3-12V 0-5kHz TTL/PWM (0V off, 3-12V on). Beam compression technology, 5W optical power laser module. Output optical power: 5W. Reference Settings for Engraving For engraving, the focal point is at the surface of the material, the focal length of LT-40W-AA is 45mm, the length of the air nozzle is 38mm, so the focal point position is 7mm(45-38mm) below the air nozzle.
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