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Research interests

Free electron lasers (FELs) represent a radical alternative to conventional lasers, being potentially the most flexible, high power and efficient generators of tunable coherent radiation from the ultra-violet to the infrared. A FEL does not have the restrictions of conventional lasers on operating wavelengths, and is constrained only by the phase-matching condition for strong interactions between the electrons and laser field - i.e. for a given periodic magnet (wiggler) structure, the wavelength is determined only by the energy of the electron beam. The FEL has come of age and there are now ‘user facilities' in Europe and America. CRP (together with Professor B N Murdin, University of Surrey) is in charge of the EPSRC funded UK ‘user station' at the Dutch FEL (FELIX) and directs an active programme on nonlinear and time-resolved (electron orbital and spin) semiconductor spectroscopy. The emphasis has been on electron and spin lifetime design and device optimisation by band structure engineering. Our programme has emphasised two research themes in semiconductor device physics: electron spin relaxation and spin injection studies of narrow gap semiconductor structures; and optically pumped Si/SiGe quantum fountain and impurity lasers. Most recently we have embarked on a joint research programme between the universities of Surrey (Murdin), UCL (Aeppli) and Heriot-Watt (Pidgeon) on coherent control of Rydberg states in silicon, pumped near 30µm with FELIX in multi-beam pump-probe configurations.


Carl Pidgeon is professor of semiconductor physics at Heriot Watt University. He is a Fellow of the Royal Society of Edinburgh and the Institute of Physics. In 1995 he became Coordinator of the EPSRC/FOM laser science programme at the Dutch Free Electron Laser (FEL - acronym FELIX), as well as continuing to be leader of the consortium and principal investigator of the UK semiconductor physics programme at FELIX.  On his retirement in 2003 he passed on this role to B N Murdin, with whom he actively collaborates. 

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  • 1 Similar Profiles
free electron lasers Physics & Astronomy
quantum wells Physics & Astronomy
life (durability) Physics & Astronomy
pumps Physics & Astronomy
lasers Physics & Astronomy
infrared lasers Physics & Astronomy
probes Physics & Astronomy
photons Physics & Astronomy

Co Author Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Research Output 1972 2019

Spin preservation during THz orbital pumping of shallow donors in silicon

Saeedi, K., Stavriasi, N., Redlich, B., van der Meer, A. F. G., Mikhaylovskiy, R., Kimel, A. V., Pidgeon, C. R. & Murdin, B. N., 30 Oct 2019, In : Journal of Physics: Condensed Matter. 31, 43, 435401.

Research output: Contribution to journalArticle

Giant multiphoton absorption for THz resonances in silicon hydrogenic donors

Van Loon, M. A. W., Stavrias, N., Le, N. H., Litvinenko, K. L., Greenland, P. T., Pidgeon, C. R., Saeedi, K., Redlich, B., Aeppli, G. & Murdin, B. N., 26 Feb 2018, In : Nature Photonics. 12, 3, p. 179-184 6 p.

Research output: Contribution to journalArticle

Open Access
multiphoton absorption

Radii of Rydberg states of isolated silicon donors

Li, J., Nguyen, H. L., Litvinenko, K. L., Clowes, S. K., Engelkamp, H., Pavlov, S. G., Hübers, H-W., Shuman, V. B., Portsel, L. M., Lodykin, A. N., Astrov, Y. A., Abrosimov, N. V., Pidgeon, C. R., Fisher, A., Zeng, Z., Niquet, Y. -M. & Murdin, B. N., 15 Aug 2018, In : Physical Review B. 98, 8, 085423.

Research output: Contribution to journalArticle

Open Access
position errors
Zeeman effect
ground state

Coherent superpositions of three states for phosphorous donors in silicon prepared using THz radiation

Chick, S., Stavrias, N., Saeedi, K., Redlich, B., Greenland, P. T., Matmon, G., Naftaly, M., Pidgeon, C., Aeppli, G. & Murdin, B. N., 24 Jul 2017, In : Nature Communications. 8, 16038.

Research output: Contribution to journalArticle

Open Access

Competition between homogeneous and inhomogeneous broadening of orbital transitions in Si: Bi

Stavrias, N., Saeedi, K., Redlich, B., Greenland, P. T., Riemann, H., Abrosimov, N. V., Thewalt, M. L. W., Pidgeon, C. R. & Murdin, B. N., 15 Oct 2017, In : Physical Review B. 96, 15, 155204.

Research output: Contribution to journalArticle

Open Access
life (durability)


Fellow of the Royal Society of Edinburgh

Carl Pidgeon (Recipient), 1982

Prize: Election to learned society