Our lasers emit tens of thousands of light pulses per second, which then get absorbed and remove contaminants from specific areas, these contaminants include rust, paint, separators, oxidation, silicones, various contaminants and more. No secondary cleaning process is usually required for a cleaning laser as the laser produces very little waste (smoke, contaminant particles).
Our range of laser systems starts from the smallest handheld variants with a power of a few tens of watts to robotic integrations with average powers of a few kilowatts. Each laser solution effectively removes contaminants but varies in power, speed and size of area to be cleaned. With adjustable parameters, the speed and quality of cleaning can be adjusted to be able to clean a larger area and achieve a higher speed at which contaminants can be removed.
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Individual laser pulses are emitted from the laser process head in beams with a circular or square profile. The pulsed fiber cleaning system can generate between 5,000 and 200,000 of these beams per second. The beam strikes the surface to be cleaned at a focal distance in the form of dots on the order of tenths of a millimetre in size (but can be increased all the way to 2mm). The uniform distribution of this concentrated energy on the surface to be cleaned is provided by either one or two mirrors integrated in the process head in our systems.
A beam profile is very small circle point or square that is further scanned by the system at a speed of usually around 5 – 10m/s (even faster than 20m/s for special laser applications) into the shape of a line or various patterns to make the cleaning laser as efficient as possible.
Pulsed lasers emit flashes of light at a time interval.
– The laser does not emit any radiation between pulses.
– The period is the time from the start of one pulse to the next.
– Pulse duration (pulse width) is the time measured during the pulse, often at its full width and half maximum (FWHM).
Continuous wave (CW) lasers provide steady emission.
– Peak, minimum and average performance are approximately the same.
– Significantly greater heating of the material to be cleaned, which can cause damage.
– Period and pulse width do not apply unless the light is modulated.
Peak power means (as opposed to average or medium power) the power within one pulse, or if you prefer, the mean power of one pulse. The product of the pulse duration and the peak power gives the pulse energy.
The repetition rate is then a quantity that indicates the number of repetitions of a periodic event for a given period of time – for a laser it means the number of pulse repetitions per 1 second. Our systems have an adjustable frequency from 5 to 200kHz, i.e. to pulses per second. The frequency can be compared to the engine of a vehicle for ease of understanding. For optimum engine function without damaging the engine, you always keep it at a certain appropriate speed. For the most effective cleaning effect without damaging the material to be cleaned, the correct repetition rate must also be used.
The answer is complicated in this case, purely from a technical point of view we can scan all powers in the same proportions, however, it must be taken into account that each laser system has a different energy and depending on the chosen lens also a different energy density. Increasing the area of the beam to be scattered reduces the efficiency of the laser and it may be that we need, for example, two or more passes of the laser for perfect cleaning.
Most of our cleaning laser systems (ROD 500, and ) have a TOP-HAT beam profile, which is characterized by a homogeneous energy distribution, however, for systems with lower average power, a Gaussian beam profile is more suitable due to the spatially normal energy distribution, so the laser can compensate for the lower power with a higher energy density and remove even more challenging material contamination.
Laser cleaning technology has become a new favorite in the cleaning field with its environmentally friendly, efficient and non-contact characteristics. Among them, single-mode and multi-mode in fiber pulse lasers are the two most commonly used laser types. This article aims to compare and analyze the differences between multi-mode and single-mode lasers in terms of performance, application and technical characteristics. By explaining the basic principles and key characteristics of the two, this article reveals the advantages of single-mode lasers in beam quality and stability, and the advantages of multi-mode lasers in output power and cost-effectiveness. At the same time, this article also explores the applicability and potential challenges of the two in different application scenarios to help readers make appropriate choices in practical applications.
The mode of a laser usually refers to the energy distribution state in a plane perpendicular to the propagation direction of the laser, and can be divided into single-mode and multi-mode. The single-mode commonly referred to in industry refers to the transverse mode of the laser, that is, there is only one mode in the cross section, which is Gaussian distributed, and the laser energy density gradually decreases from the center to the outer edge. The laser beam output by a single mode has the characteristics of high beam quality, small beam diameter, small divergence angle, and energy distribution close to the ideal Gaussian curve. In addition, the single mode has better focusing characteristics, a small focusing spot and strong mode stability, which is suitable for cleaning scenarios that require strong removal, such as rust.
Figure 1：Schematic diagram of single-mode energy distribution
Multimode lasers are spatial energy distribution modes formed by the superposition of multiple distribution modes. The energy distribution in the spot is relatively uniform, and the more modes there are, the more uniform the energy distribution is. Its beam is also called a flat-top beam. Compared with single-mode, multimode lasers have poorer beam quality and a larger divergence angle. They require an optical system with a larger aperture for transmission, and the focused spot is larger than that of single-mode. However, multimode is easier to achieve large single pulse energy, high peak power, and high average power output, and the energy distribution is uniform, which is more advantageous for cleaning scenarios that require less damage and high efficiency, such as molds.
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Figure 2：Schematic diagram of multi-mode energy distribution
With its good beam quality, small focused spot, and high energy density, single-mode lasers are particularly suitable for cleaning contaminants with strong adhesion (such as green rust), as well as cleaning thin materials and precision parts that are sensitive to heat input. This type of laser has concentrated energy and significant cleaning effect, but may cause a certain degree of damage to the base material, especially under high energy input conditions.
Multi-mode lasers are suitable for applications that require no damage to the substrate after cleaning, such as mold cleaning. The energy distribution of the multi-mode beam is relatively uniform and the peak power is high. The peak power density can be precisely controlled to exceed the damage threshold of contaminants but lower than the damage threshold of the substrate, thereby effectively removing contaminants without damaging the material surface. At the same time, multi-mode lasers have larger focused spots and generally have higher cleaning efficiency. However, for strongly adherent contaminants, multimode laser cleaning may not be as effective as single-mode lasers.
Figure 3：Comparison of single-mode and multi-mode cleaning capabilities
Based on the respective advantages and disadvantages of single-mode and multi-mode cleaning lasers, the application scenarios in which they are applicable are also differentBased on the respective advantages and disadvantages of single-mode and multi-mode cleaning lasers, their applicable application scenarios are also different.
Figure 4：Metal rust removal
Figure 5：Weld oxide cleaning
Figure 6：Precision parts cleaning
Figure 7：Mode cleaning
Figure 8：Perovskite cell edge cleaning
Figure 9：Laser texturing
Single-mode lasers have the characteristics of high beam quality and strong cleaning ability, while multi-mode lasers have the characteristics of flat-top beam, high energy, long focal depth, little damage to the substrate or even no damage.
Single-mode lasers are suitable for high-precision cleaning tasks, especially for removing rust and cleaning complex small parts , and can provide more accurate and powerful cleaning effects . Multi-mode lasers are suitable for uniformly treating large areas of contaminants, such as mold cleaning and solar cell manufacturing , with little or no damage to the substrate.
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