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The Applications of Green Lasers in Modern Technology

The Applications of Green Lasers in Modern Technology

Lasers are now used in a number of industrial applications owing to their excellent beam properties and the high degree of control that can be achieved over these. Depending on the type of laser, achieving high degrees of spatial and temporal coherence is possible. Many high-power systems are now also available for applications such as industrial cutting.

Green lasers – lasers that emit in the green region of the visible spectrum – are commonplace as laser pointers, interferometers, medical applications, and pump lasers for solid-state systems, such as titanium-sapphire lasers that are commonly used for the generation of temporally short laser pulses [1]. The sensitivity of the human eye to green colors combined with the high power efficiency of green lasers makes it easy to create beams that can be seen easily. This is advantageous e.g. in machine vision or calibration applications where a human eye needs to see the beam, too.

More recently, green lasers have been widely employed in additive manufacturing. The advantage of green laser sources over near-infrared lasers is that the interaction of the light with the surface, which is often a reflective metal like copper, iridium, or gold, results in much less reflection with green lasers and, therefore, less reflective losses and spatter [2].

The Efficiency of Green Lasers

One of the developments that has made green lasers so successful in several applications is the availability of small-footprint solid-state diode lasers that emit in this wavelength region. Solid-state lasers are preferred for many applications as they are more robust and require less maintenance than laser systems with liquid or gas used as the gain media. Generally, the solid gain medium and fewer moving parts also mean a more stable system suitable for portable applications or metrological or interferometric measurements where stability is key.

In manufacturing, lasers are considered one route to a ‘greener’ sustainable future [3]. This opportunity is because of the reduced waste from additive manufacturing processes. The improved wall-plug efficiency of green lasers is significant for achieving this, as many high-power laser systems for industrial cutting are still highly energetically inefficient.

Schäfter + Kirchhoff GmbH

Schäfter + Kirchhoff GmbH are experts in the development of optical products. Our product line includes a number of green laser line and spot generators in the mW-range for applications such as machine vision. We also provide a series of easy-to-use, specially designed fiber collimators to use with green laser systems, as well as special coupling sets to fiber couple common solid state lasers (like OPSL or DPSS lasers) to fibers.

Contact Schäfter + Kirchhoff GmbH today to find out how their product range could support your work and innovation.

References and further information

[1] Risk, W. P., Risk, W. P., Gosnell, T. R., & Nurmikko, A. V. (2003). Compact blue-green lasers. Cambridge University Press.

[2] Fu, E., (2022) Green Lasers,, accessed March 2023

[3] Lee, H., Lim, C. H. J., Low, M. J., Tham, N., Murukeshan, V. M., & Kim, Y. J. (2017). Lasers in additive manufacturing: A review. International Journal of Precision Engineering and Manufacturing - Green Technology, 4(3), 307–322.