Imperial College London


Faculty of Natural SciencesDepartment of Physics

Imperial College Research Fellow







640Blackett LaboratorySouth Kensington Campus





Dr. William Kerridge-Johns holds an Imperial College Research Fellowship based in the Photonics Group. His research is focussed on developing novel lasers to generate high-power optical vortex beams.

Optical vortex beams have a corkscrew structure giving them orbital angular momentum. This type of spatially structured light enables a wide variety of applications by providing another degree of control to laser output. William’s research is based on the interface between structured light generation and laser design, which creates new technologies and capabilities for optical vortex research at high power. He is interested and involved in tailoring these devices towards a diverse range of applications.

Currently open to PhD applications based in this dynamic research area, please contact for more information.

Full publication list: Google Scholar

Selected Publications

Journal Articles

Kerridge-Johns WR, Damzen MJ, 2018, Temperature effects on tunable CW Alexandrite lasers under diode end-pumping, Optics Express, Vol:26, ISSN:1094-4087, Pages:7771-7785

Kerridge-Johns WR, Damzen MJ, 2016, Analytical model of tunable Alexandrite lasing under diode end-pumping with experimental comparison, Journal of the Optical Society of America B - Optical Physics, Vol:33, ISSN:0740-3224, Pages:2525-2534

Kerridge-Johns WR, Damzen MJ, 2015, Analysis of pump excited state absorption and its impact on laser efficiency, Laser Physics Letters, Vol:12, ISSN:1612-202X


Kerridge-Johns WR, Damzen MJ, 2017, Anti-Resonant Ring Laser Cavities, Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE

More Publications