Guangzhou Delan Laser Technology Co., Ltd.: professional manufacturing and production of laser inkjet printer, carbon dioxide laser marking machine, semiconductor laser marking machine, fiber laser marking machine, laser coding machine, laser marking machine when we operate laser marking machine Whether the effect can achieve the desired effect depends to a large extent on the setting of the laser parameters and the interdependence of these parameters. Before selecting a laser wavelength or processing machine, engineers and technicians must fully understand the relationship between the laser parameters in order to properly set the parameters of various materials to ensure the laser marking effect. The following analysis of the laser marking machine parameters is set. For your reference;
1. Laser energy.
Setting the laser parameters initially starts with the energy setting of a single pulse. With the latest generation of power supplies, the energy per pulse can be set according to the expected transfer curve, allowing the energy to gradually increase at the beginning of the pulse and gradually decrease at the end. Adjusting the pulse shape helps to improve the processing control effect.
2. Power density.
The power density actually measures the number of laser photons that reach the material. The power density is in watts per square centimeter and is calculated by dividing the pulse energy by the spot area. Even within a single spot, the power density varies greatly due to the different laser beam quality, and the choice of density is not the same for the material.
3.M2.
M2 measures the energy distribution within the beam. The energy at the center of the ideal beam with M2 equal to 1 reaches a peak, and the energy from the center to the surrounding is Gaussian. M2 is small, close to 1, suitable for micromachining, and M2 is larger (in the range of 30–100), suitable for heat treatment and welding.
4. Pulse width and repetition frequency.
The pulse width is defined as the duration of the laser energy pulse. Most laser processing is done in pulse mode. In pulse mode, the laser emits energy in pulses at a set repetition rate and duration. Machining operations where the laser is continuously turned on (called continuous wave or CW mode) include: soldering, soldering, and heat processing.
5. Peak power.
Although the average power rating of the laser may be small, the peak power per pulse may be very large. For example, a typical 10W laser has a peak power of 5 kW. This may be due to the release of laser energy during a very short pulse time. The peak power can be calculated by dividing the pulse energy by the pulse width. If a pulse releases 1 joule of energy in 1 millisecond, the peak power is 1 kW. However, since the calculated average over the entire pulse width, the actual peak power may be greater because the energy is not uniformly released throughout the pulse duration.
Spot diameter. The spot diameter depends on the focal length, wavelength, M2 and beam diameter, and the relationship is as follows:
Spot diameter = 2fλ M2 /D,
Where f is the focal length of the focusing lens, λ is the wavelength, M2 is the beam quality indicator, and D is the beam diameter.
Note that the excimer laser beam is of poor quality and cannot be focused. Therefore, such a laser is passed through a mask to form a desired pattern, which is commonly used for etching of silicon chips.
Except that the wavelength is determined after selecting the laser type, all other parameters are almost interdependent, so care must be taken. For example, when a lens with a shorter focal length is used to change the spot size, the power density is increased unless the overall power is scaled down at the same time.
We must understand how these parameters interact. As devices become smaller and more sophisticated, engineers must carefully analyze the various characteristics of the laser system and how it affects material processing.
For more information on the laser industry, please pay attention to Guangzhou Delan Laser - the laser industry expert around you
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Guangzhou Delan Laser Technology Co., Ltd.: professional manufacturing and production of laser inkjet printer, carbon dioxide laser marking machine, semiconductor laser marking machine, fiber laser marking machine, laser coding machine, contact Zhao Sheng, 020-66230280 UV laser Marking machine, Shantou laser marking machine, Guangzhou laser marking machine, Guangzhou CO2 laser marking machine, Guangdong semiconductor laser marking machine, Changsha laser marking machine, metal cutting machine, non-metal cutting machine
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