Czesław KOEPKE




Nicholas Copernicus University, Institute of Physics

ul. Grudziądzka 5/7, 87-100 Toruń

tel.: (56) 611-3239, fax.: (56) 622-5397, e-mail:


Education: Nicholas Copernicus University, Institute of Physics – MSc (1976), PhD (1983), Dr.hab. (1994); Boston University – Postdoctoral Fellowship (1988-91)

Employment: Nicholas Copernicus University, Institute of Physics – Postgraduate Student (1976-79), Member of technical staff (1979), Assistant Lecturer (1982), Lecturer, Adjunct (1984); Boston University, Chemistry Department – Research Associate (1988-91); Nicholas Copernicus University – Senior Lecturer, Dr. hab. (1994), Vice-Director of the Institute of Physics (1995-2006), Extraordinary Professor (1999), Professor (2006), Ordinary Professor (2009)

Activities: Physics of the lasers, optical nonlinearities in semiconductors, solid state spectroscopy, photonics, excited-state spectroscopy. First observations and interpretations of the excited state absorption in d0 molecular complexes in solids, discovery and interpretation of the excited-state photochromism in solids (bismuth germanate). Observation and interpretation of the excited-state absorption characteristics in various glasses, glass ceramics and crystals doped with transition metal (mostly chromium of various valence states) and rare earth (e.g. holmium, neodymium, praseodymium) ions. Observation and interpretation of various anti-Stokes and upconversion emissions in rare earth – activated glasses, glass ceramics and crystals.

Honours and memberships: Polish Physical Society

Selected papers: Optical Nonlinearities and Bistability in Semiconductors, Acta Phys. Polon. A 75, 219 (1989); Cz. Koepke, A. Lempicki, Electronic Photochromism: Case Study of Bismuth Germanate, J. Luminescence 47, 227 (1991); Cz. Koepke, A.J. Wojtowicz, and A. Lempicki, Excited-State Absorption in Excimer-Pumped CaWO4 Crystals, J. Luminescence, 54, 345 (1993); Cz. Koepke, A.J. Wojtowicz, and A. Lempicki, Study of Closed-Shell Molecular Complexes as Possible Laser Media, IEEE J. Quant. Electronics, QE-31, 1554 (1995); Cz. Koepke, K. Wiśniewski, M. Grinberg, D.L. Russell, K. Holliday, and G.H. Beall, Excited State Absorption in Cr3+-Doped Gahnite Glass Ceramics, J. Luminescence, 78, 135 (1998); Cz. Koepke, K. Wisniewski, and M. Naftaly, Optical spectroscopy and multiple-line gain in Pr3+- activated fluoroaluminate glass, J. Phys.: Condens. Matter 14, 6785 (2002); Cz. Koepke, K. Wisniewski, M. Grinberg and F. Rozploch, Excited state spectroscopy of the silica sol-gel glass activated by Cr5+ and Cr6+ ions, J. Phys.: Condens. Matter 14, 11553 (2002); Cz. Koepke, K. Wisniewski, L. Sikorski, D. Piatkowski, K. Kowalska and M. Naftaly, Upconverted luminescence under 800 nm laser diode excitation In Nd3+- activated fluoroaluminate glass, Opt. Mater. 28, 129 (2006); D. Piątkowski, K. Wiśniewski, M. Różański, Cz. Koepke, M. Kaczkan, M. Klimczak, R. Piramidowicz, M. Malinowski, „Excited state absorption spectroscopy of ZBLAN:Ho3+ glass - experiment and simulation”, J. Phys.: Cond. Matter 20 (2008) 155201; Cz. Koepke, K. Wiśniewski, D. Piątkowski, „Broadband (~ 300 nm) optical gain in the ZAS (ZrO2-Al2O3-SiO2) glass activated by chromium”, Opt. Mater. 31 (2009) 537; Cz. Koepke, K. Wiśniewski, D. Piątkowski, M. Malinowski, „Competition between two types of anti-Stokes emission in Ho3+- activated ZBLAN glass”, J. Phys.: Cond. Matter 21 (2009) 035113; P. Stremplewski, C. Koepke, D. Piatkowski, M. Rozanski, „Nonmonotonic saturation characteristic and excited state absorption in long optical fiber”, Appl Phys B 103 (2011) 123;  P. Stremplewski, Cz. Koepke, “ASE noise independent small signal modal gain measurements and mode imaging in double clad Nd3+- doped fiber around 900 nm”, Optics Express 22 (2014) 24847, P. Stremplewski, Cz. Koepke, “Up-converted emission and mode beating in Er3+- doped fibers”, Optics Express 23 (2015) 28288-28299. Total number of papers: >70.

Born: 1952 Chełmno; Married (1977),  Children: son (1979).

Hobbies: music, jazz, architecture, modern art. and modern literature.