- Double groove broadband gratingsJuha Pietarinen
Department of Physics and Mathematics, University of Joensuu, Joensuu, Finland
Opt Express 16:13824-30. 2008..The deviation of the effective refractive index between waveguides as a function of the wavelength is utilized to compensate the strong wavelength dependence of the efficiency of diffraction gratings...
- Low-cost fabrication of form-birefringent quarter-wave platesBirgit Päivänranta
University of Joensuu, Department of Physics and Mathematics, FI 80101 Joensuu, Finland
Opt Express 16:16334-42. 2008..The measurements show that the replicas behave as high-performance quarter-wave plates for the design wavelength...