Highly Sensitive Detection of Naphthalene in Solvent Vapor Using a Functionalized PBG Refractive Index Sensor. - Maiko Girschikofsky; Manuel Rosenberger; Stefan Belle; Malte Brutschy; Siegfried R. Waldvogel; Ralf Hellmann (Sensors, 2012)

Micromachining of AlN and Al2O3 Using Fiber Laser. - Florian Preusch; Benedikt Adelmann; Ralf Hellmann (Micromachines, 2014)

Characterization of Laser Beam Shaping Optics Based on Their Ablation Geometry of Thin Films. - Stefan Rung; Johannes Barth; Ralf Hellmann (Micromachines, 2014)

Simultaneous 2D Strain Sensing Using Polymer Planar Bragg Gratings. - Manuel Rosenberger; Waltraud Eisenbeil; Bernhard Schmauss; Ralf Hellmann (Sensors, 2015)

Towards 1-component Bragg-grating based shape sensing. - Hendrikje Pauer; Manuel Rosenberger; Maiko Girschikofsky; Ralf Hellmann; Wilderich Tuschmann; Heinz Wörn (FUSION, 2016)

Waveguide Bragg Gratings in Ormocer®s for Temperature Sensing. - Maiko Girschikofsky; Manuel Rosenberger; Michael Förthner; Mathias Rommel; Lothar Frey; Ralf Hellmann (Sensors, 2017)

UV-Writing of a Superstructure Waveguide Bragg Grating in a Planar Polymer Substrate. - Manuel Rosenberger; Bernhard Schmauss; Ralf Hellmann (Sensors, 2017)

Investigation on shear and tensile strength of laser welded electrical sheet stacks. - Benedikt Adelmann; Christian Lutz; Ralf Hellmann (CASE, 2018)

Optical Sensor for Real-Time Detection of Trichlorofluoromethane. - Maiko Girschikofsky; Dimitrij Ryvlin; Siegfried R. Waldvogel; Ralf Hellmann (Sensors, 2019)

Multipurpose Polymer Bragg Grating-Based Optomechanical Sensor Pad. - Steffen Hessler; Patrick Bott; Stefan Kefer; Bernhard Schmauss; Ralf Hellmann (Sensors, 2019)

Microstructure-Based Fiber-To-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications. - Stefan Kefer; Theresia Sauer; Steffen Hessler; Michael Kaloudis; Ralf Hellmann (Sensors, 2020)

Simultaneous Burr and Cut Interruption Detection during Laser Cutting with Neural Networks. - Benedikt Adelmann; Ralf Hellmann (Sensors, 2021)

Laser Cut Interruption Detection from Small Images by Using Convolutional Neural Network. - Benedikt Adelmann; Max Schleier; Ralf Hellmann (Sensors, 2021)

Deep UV Formation of Long-Term Stable Optical Bragg Gratings in Epoxy Waveguides and Their Biomedical Sensing Potentials. - Steffen Hessler; Marieke Rüth; Horst-Dieter Lemke; Bernhard Schmauss; Ralf Hellmann (Sensors, 2021)

Edge effects in radial porosity profiles from CT measurements and melt pool signal intensities for laser powder bed fusion. - Jorrit Voigt; Thomas Bock; Uwe Hilpert; Ralf Hellmann; Michael Möckel (CoRR, 2022)

Image Processing Algorithm for In Situ Monitoring Fiber Laser Remote Cutting by a High-Speed Camera. - Max Schleier; Benedikt Adelmann; Cemal Esen; Ralf Hellmann (Sensors, 2022)