Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Stefan Kefer"'
Publikováno v:
Photonics, Vol 11, Iss 5, p 397 (2024)
Polarization states define a fundamental property in optics. Consequently, polarization state characterization is essential in many areas of both field industrial applications and scientific research. However, a full identification of space-variant S
Externí odkaz:
https://doaj.org/article/27112fddb0b24a068159e7dd94b0b6cf
Publikováno v:
Polymers, Vol 16, Iss 2, p 168 (2024)
This contribution quantifies the birefringence within injection-molded cyclic olefin copolymer plates and discusses its impact on the mechanical properties of the plates. It also focuses on the impact of birefringence on integrated waveguides and Bra
Externí odkaz:
https://doaj.org/article/d06ff82e4e22490a8bddc2a908595723
Publikováno v:
Materials, Vol 15, Iss 18, p 6233 (2022)
Sapphire is a robust and wear-resistant material. However, efficient and high-quality micromachining is still a challenge. This contribution demonstrates and discusses two novels, previously unreported approaches for femtosecond laser-based micromach
Externí odkaz:
https://doaj.org/article/0b95b3b7090b4145acc5eca149c000f6
Publikováno v:
Photonics, Vol 9, Iss 4, p 234 (2022)
This contribution demonstrates photonic crystal waveguides generated within bulk planar sapphire substrates. A femtosecond laser is used to modify the refractive index in a hexagonal pattern around the pristine waveguide core. Near-field measurements
Externí odkaz:
https://doaj.org/article/222540c4614c476b919ea952e4f4e16e
Publikováno v:
Laser-based Micro- and Nanoprocessing XVII.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ace646a6d9d632b082e67d03460fd636
https://doi.org/10.1117/12.2648758
https://doi.org/10.1117/12.2648758
Publikováno v:
Organic Photonic Materials and Devices XXV.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6907fe260ac86ac33dda62f39583d44
https://doi.org/10.1117/12.2648723
https://doi.org/10.1117/12.2648723
Autor:
Yong Zhou, Wenbin Hu, Yongxin Ye, Jingjing Wang, Jixiang Dai, Minghong Yang, Ralf Hellmann, Stefan Kefer
Publikováno v:
Advanced Sensor Systems and Applications XII.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::593646435a6c20f57ff4f9e4051f25aa
https://doi.org/10.1117/12.2643877
https://doi.org/10.1117/12.2643877
Publikováno v:
Sensors, Vol 20, Iss 19, p 5452 (2020)
This article proposes and demonstrates a robust microstructure-based fiber-to-chip coupling scheme for planar Bragg grating devices. A polymer planar Bragg grating substrate is manufactured and microstructured by means of a micromilling process, whil
Externí odkaz:
https://doaj.org/article/820024387d864bb7bf423763d743ce31
Autor:
Stefan Kefer, Theresia Sauer, Steffen Hessler, Michael Kaloudis, Bernhard Schmauss, Ralf Hellmann
Publikováno v:
Polymers, Vol 12, Iss 3, p 715 (2020)
This contribution demonstrates the functionality of polymer planar Bragg grating (PPBG) sensors integrated into commercial-grade carbon fiber reinforced polymer (CFRP) components. Multiple CFRP specimens are generated by curing a stack of pre-impregn
Externí odkaz:
https://doaj.org/article/a413afdcb2f146038ae97875a57080ec
Publikováno v:
Sensors, Vol 19, Iss 19, p 4101 (2019)
Flexible epoxy waveguide Bragg gratings are fabricated on a low-modulus TPX™ polymethylpentene polyolefin substrate for an easy to manufacture and low-cost optomechanical sensor pad providing exceedingly multipurpose application potentials. Rectang
Externí odkaz:
https://doaj.org/article/954cc41709ec49c6b47ea2ece8792bc4