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2017-04-10 11:30
The Relationship between Laser Surface Machining and Laser Marking

The wavelength of the laser usually belongs to the near infrared range of around 1070 nm, making it ideal for marking most metal products because the reflectivity of this wavelength is lower compared to longer CO2 lasers. But even in this wavelength range, the difficulty of marking different metals are not the same. Aluminum, copper and its alloys are widely used in almost every industry, these materials can be used red laser pointer marking, but want to heat in such conditions on the metal play clearly visible dark mark, and sometimes still difficult. In addition, a proven technique has shown that a highly transmissive material can usually be processed with a minimum damage within a pulse width that is not associated with an unexpected non-linear characteristic.

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In the field of industrial laser materials processing, the term laser surface processing is often used to describe a series of continuous wave (CW), power of several kilowatts of near infrared laser source processing activities. However, the above process is completely different from the techniques described herein that can be considered as micron and nanoscale surface applications. Has been the use of short pulse picosecond and femtosecond ultrafast lasers developed many of these processes, for non-thermal mechanism on how to modify the surface processing.

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The main drawback of these processes is that their investment and operating costs are still high even if they fall into the low power range of these categories of 50000mw laser pointer. Since the processing speed usually depends on the average power of the laser, the laser processing cost for actual industrial coverage is likely to be high for most industrial laser users. Recently, the range of mature nanosecond pulsed fiber lasers has been extended to sub-nanosecond, followed by an increase in the magnitude of the peak power capability. Therefore, it is possible to develop a new laser surface processing technology using a cost-effective long-picosecond laser source. Although these techniques are commonly referred to as laser microforms, these processes are mechanically related to laser marking because they are limited to the surface treatment of components and often require the use of laser ablation and melting processes.

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Fiber lasers are widely known advantages to ensure that they are dominant in most applications of near-infrared 5mw green laser light source options. Of course, pulsed fiber laser sources with high average power (up to 4kW), opened the laser cleaning and laser stripping applications. The pulse duration of the new type of fiber laser used here is 0.15 ~ 5ns, the peak power is 0.5mW, the brightness is <2 per square meter, and the pulse repetition rate exceeds 1MHz under the condition of the average power up to 30W. The purpose of this paper is to improve the understanding of micrometer laser functions, which are used for surface microforms or marking, which are generally considered to be difficult to use standard infrared wavelengths for marking materials such as copper and glass.

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We explored how to quantify laser marking and micro-modeling, and use these techniques to 3500mw laser pointer marking aluminum. We have also developed a technology for marking more challenging copper and uncoated surfaces, and it is clear that there will be future process applications for a wider range of surface structures. Laser welding between copper or between other metals has always been a challenge in the field of low power heat conduction welding because of the inherent high reflectivity and diffusion coefficients, as well as inconsistent primary surface oxide layers. The fact that this dark marking technology in the welding of copper, can improve consistency. As part of the ongoing study, surface finishes are improved and regulated by laser beams, which can also improve the bonding between copper or aluminum and other different metals.

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In the related case, the same sub-nanosecond laser was used to laser pre-treat the metal so that it could then be bonded to the transmissive polymer. The advantages of laser cleaning surfaces, such as increased surface area due to laser pretreatment and local laser heating, facilitate the combination of specific metal-polymer combinations to easily achieve the strength level of the substrate. Finally, the use of traditional 8000mw laser pointer scanning technology on the optical surface of the diffuse or light scattering capability is guaranteed. The application being considered is to control the glare, which in turn makes the processing object easier to see for the human eye. The demonstrated performance and cost-effective introduction of fiber lasers has enabled customers to shift laser marking from low-cost applications to higher value-added marking and microforming applications.

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2017-04-10 11:30