The interview with Gerhard Kimmel has been published in the current issue of the Laser Technik Journal (Volume 15, October 2018).
Online in the Wiley Online Library – Link.
The PDF with the interview can be found here – Link.
The contents of the booklet can be found under the following links:
http://www.pro-physik.de/phy/zeitschriften/ltjissue.html,
http://www.photonicsviews.com/laser-technik-journal-4-2018/ and