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Laser processing with temperature control monitoring

Hamamatsu Photonics´ T-SMILS® Laser Heating system could be the future of laser processing

Hamamatsu Photonics´ T-SMILS Laser Heating system could be the future of laser processing (Credit: Hamamatsu)

Experience the future of laser processing technology with Hamamatsu Photonics´ T-SMILS Laser Heating system, revolutionising laser processing through real-time temperature monitoring

Introducing the T-SMILS Laser Heating System

Hamamatsu’s corporate philosophy emphasises the advancement of photonics through extensive research and yields products that are regarded as state-of-the-art. All products are designed to cover the entire optical spectrum and provide solutions for a wide variety of applications including analytical, consumer, industrial, and medical instrumentation. 

However, few people recognise that as a company Hamamatsu also offers a range of laser products.

This range of semiconductor laser applied products can be used in a number of applications, from R&D to full-scale production. Recently, Hamamatsu introduced the T-SMILS Laser Heating system (L15570 series) as a new addition to the SPOLD product line, ideally suited to applications requiring critical temperature control. This product represents an upgrade to our previous laser heating technology, using a much faster sensing regime which allows you not only to monitor, but to use temperature instead of power as the main metric for laser processing.

Product functionality

The basic function of the T-SMILS system is to heat the materials to be processed with the aid of laser energy, thereby initiating the desired thermal processing. Diode lasers are used in these products, which mostly operate with a wavelength of 940 nm and an output power of up to 360 W. The laser diodes are used to produce a wide range of laser outputs. Spot sizes from 0.1 to 6.4 mm in diameter and line optics are available to adapt the laser properties if required. Hamamatsu uses a special process to optimise the shape of the laser beam and achieve what is known as a 'top hat beam profile'. The resulting energy distribution allows an optimal and homogeneous heat input to the objects to be processed.

However, the unique feature is the integrated process monitoring. The T-SMILS can measure absolute temperature, whereas most temperature monitoring systems use relative temperature measurement, making it possible to monitor the process temperature in real time during treatment by the laser. Therefore, it allows us to control the process to a higher extent than previous laser systems. The current application focus for this system includes plastics welding, sintering, curing and soldering, with the confidence to resolve the inconsistencies that have been faced by the plastics industry for many years.

For example, when two plastics are welded together, the temperatures must be kept exactly within very narrow limits in order to achieve the desired strength of the joint. If the traversing speed or the laser power is not set optimally, the welding process will not achieve the desired result. Therefore, using this new temperature functionality, variances between plastics welding batches will no longer be an issue as the temperature at the melt-point is controlled automatically and continually by this new sensing technology.

The difference that temperature feedback control makes to a laser weld

In the image above, you can see the difference that temperature feedback control makes to a laser weld. On the left-hand image, we can see a microscope image of a laser weld at constant power through a corner. The laser power is unevenly distributed, causing over-melt and under-melt at different points. However, the image on the right-hand shows a consistent weld using temperature feedback control.

Comprehensive service

Hamamatsu provides a comprehensive service and with our experience, we make a significant contribution to ensuring that users can implement their systems as quickly as possible. As part of this service we support our customers in the evaluation. We can advise them which spot sizes and laser heads are best suited for the respective application, among other things. The wide range of options for spot sizes and laser heads makes our laser product range very flexible as they can be tailored precisely to customer requirements.


Product image: T-SMILS Laser Heating System (L15570 series)

With integrated real-time temperature monitoring, Hamamatsu can provide the user with completely new possibilities for laser processing. In combination with our experience in this field and our laser laboratories based in Germany and Japan, we offer our customers added value in the evaluation and implementation of their solutions.

Unlock the art of plastic welding with precision and minimal effort using Hamamatsu’s Temperature Sensing Module Integrated Laser System (T-SMILS). Watch the video below to see how you can ensure flawless bonds with absolute temperature control monitoring.  

Contact information
Hamamatsu Photonics Europe
Arzbergerstr. 10, 82211 Herrsching am Ammersee, Germany Tel: (49)8152-375-0


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Laser processing, Diode lasers

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