Laser-based Soldering Technique for Hermetical Sealing of the Calibration Target for the Exomars’ Raman Instrument Topics: Optical Instrumentation; Optics in Astronomy and Astrophysics In Proceedings of the 4th International Conference on Photonics, Optics and Laser Technology PHOTOPTICS - Volume 1, 55-61, 2016 , Rome, Italy