Fiber Lasers: What’s the Difference Between Single-Mode and Multi-Mode?
Time:
May 04,2022
The fiber laser is a core component of laser cutting machines, and generally has a significant impact on the cutting performance of these machines. When selecting a laser cutting machine, customers pay close attention to the brand of the fiber laser, its service life, and even the way its modules are integrated. So today, High-Energy Laser will introduce you to the modular composition of fiber lasers.
The fiber laser is a core component of laser cutting machines, and generally has a significant impact on the cutting performance of these machines. When selecting a laser cutting machine, customers pay close attention to the brand of the fiber laser, its service life, and even the way its modules are integrated. So today, High-Energy Laser will introduce you to the modular composition of fiber lasers.
The module composition of fiber lasers is divided into single-mode and multi-mode types. In cutting applications, the focused spot size significantly affects the quality of the cut. Single-mode lasers have a thinner fiber core and superior beam quality compared to multi-mode lasers. Their energy distribution follows a Gaussian profile, with the highest energy density at the center, resulting in a three-dimensional graph that resembles a sharp, rounded mountain peak.
The core of a multimode laser is relatively thicker than that of a single-mode laser. As a result, its beam quality is slightly inferior to that of a single-mode laser, and its energy distribution is more evenly spread across the spot compared to the concentrated intensity of a single-mode beam. In a three-dimensional image, the multimode beam profile resembles an inverted cup; when comparing the steepness of the edges, the multimode beam exhibits much steeper slopes than the single-mode beam. For cutting 1 mm-thick sheets, the single-mode laser achieves a cutting speed that is 20% faster than the multimode laser, with visually similar results. However, starting from 2 mm thickness, the speed advantage of the single-mode laser gradually diminishes. From 3 mm onward, both in terms of cutting speed and cutting quality, the high-power multimode laser clearly demonstrates significant advantages.
Therefore, single-mode fiber lasers have advantages when processing thin sheets, while multi-mode fiber lasers excel in thick-sheet applications. There’s no point in directly comparing single-mode and multi-mode lasers—each is simply a configuration option for fiber lasers, much like a car: sedans are best suited for highways, while off-road vehicles are ideal for mountain terrain. Yet, a sedan can also handle mountain roads, and an off-road vehicle can manage highways as well. So, whether to choose a multi-mode or single-mode fiber laser ultimately depends on the specific processing requirements of the end customer.
So, how should we choose between single-mode and multi-mode?
High-power laser recommendations: From the perspective of power levels, lasers with outputs below 1000W, due to their inherently low energy, are primarily suited for processing thin sheets. Therefore, lasers with outputs up to 1 kW are best configured with single-mode operation, reflecting the actual market conditions. For lasers above 1 kW, both thin and thick materials need to be accommodated. From the standpoint of the entire manufacturing industry, improving processing quality is an absolute necessity—a requirement that cannot be compromised. Consequently, when selecting high-power lasers, many users will not consider single-mode configurations; ensuring top-notch processing quality must always come first!
Meanwhile, single-mode fiber cores are generally thinner, which means that for the same laser power, a single-mode core can carry a greater optical energy. This poses a significant challenge to the material itself. Moreover, when cutting highly reflective materials, the intense reflected light and the outgoing laser beam overlap. If the fiber material lacks sufficient tolerance, it can easily lead to “burning” of the fiber core—and this also presents a serious challenge to the lifespan of the fiber core material! For these reasons, many laser manufacturers still opt for multi-mode configurations when designing high-power fiber lasers.
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