How to choose a Best laser marking machine for your marking application
Material type, Marking Quality required and marking speed are all needed to think about for choosing laser marking machine. Here we will discuss metal marking, as solid-state continuous-wave and CO2 laser marking are not used for metal marking, so we will focus on solid-state pulsed lasers, which include Nd:YAG, Nd:YVO4 and fiber laser marking machine.
Firstly, let’s see how material absorb laser light in different wavelength when it be marked. Generally, Ferrous and non-ferrous materials have excellent absorption at 1064 nm light, while precious metals do good at 355 and 532 nm light. Plastics also absorb high wavelength light (see Fig. 1).
Nd:YAG laser marking machine has been used for marking over 25 years and is a main member in marking industry. The previous Nd:YAG laser marking machine was made of lamp-pumped, but is replaced by diode pumping Gradually. Diode-based system is robustness with excellent working life time which may reach more than 35,000 hours prior to failure of the diodes. Nd:YAG laser’s beam quality can make Nd:YAG laser marking machine get a very small spot size and then produce high peak power. All that can promise Nd:YAG laser marking machine mark in deep engraving with crisp, clear marks and small characters.
Vanadate laser, another diode-pumped laser marking machine, can emit three different wavelengths: 1064, 532 (green), and 355 nm (blue). Offering stability pulse-to-pulse beam quality, Vanadate laser marking machine is quite suitable for ablation marking and heat-affected zone (HAZ) applications. One of vanadate laser marking machine’s usage is day/night marking for automotive.
Fiber Laser Marking Machine is new member for metal marking, which consists of Fiber Laser, High Speed Scanning Vibration Mirror System which helps it realize the marking function. Fiber Laser Marking Machine of high electro-optic conversion efficiency, long working time, high marking speed, small size, good quality of output beam, high reliability, is great economical solution for metal marking.
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