Hey Steemians,
my contemporary contribution to the #SciencePic initiative shows the use of a contactless laser heating in my former group. The pictures are quite old (from 2013) and the quality not satisfying. Therefore, I show you 2 additional pictures as a little bonus.
Our laser heating had a wavelength of 808 nm and 2 modules with 40 W each. Each outlet had a lens/collimator to create a spot of about 1x2 cm. This wavelength is nearly invisible to the human eyes, but of course, we had special glasses to protect our eyes. If you looked directly into the beam, there would be immediate damage to your sight. Furthermore, scattered radiation would not be healthy, too.
The first picture shows the two outlets of the laser on the left and right bottom side. On the upper right side, you can see the lens of a pyrometer to measure the temperature. As you can see, the camera chip is able to detect the laser spot on the ampoule in the middle. We had a flourescent detection card to view the spot, too. Sometimes, we used a camera though to make the spot visible.
The two bonus pictures show the laser heating again and also the reflections of the scattered radiation on the walls. One is with the light turned on and the other is the same motive in the dark.
See you next time!