Professor Michalis Zervas

PhD Projects:

Dynamics and Nonlinear Effects in High Power Fibre Lasers

Supervisors:  Professor Michalis Zervas in conjunction with Dr Christophe Codemard

High performance, high power fibre lasers (FLs) are now well established as an extremely robust and reliable photon engine enabling a growing and diverse number of demanding industrial and medical applications. Compared to rival technologies, such as CO2, LPSS, DPSS and disk lasers, FLs offer a number of unique characteristics that have resulted in their wide adoption in an increasing number of industrial sectors. In addition to enhancing existing applications, FLs have been very successful in enabling novel applications and thus continuing to increase their market share. 

To continue this trend and further increase the FL functionality and stability, this project will consider depth the main issues related to power scaling in fibre lasers, such as suitable pumping schemes and pump requirements, fibre designs, limiting non-linear effects such as SRS and SBS). Emphasis will be placed particularly on the study of dynamic effects related to output power stability of various advanced FL systems currently used in industry. The project comprises theoretical analysis and understanding of the output power dynamics of various practical FL systems, as well as, experimental investigation of the effects. 

The project gives the opportunity to work closely with SPI Lasers plc, a leading FL manufacturer that has span out from the ORC.  

Novel Microresonators for Advanced Optical Devices

Supervisors: Prof Michalis N Zervas and Dr Senthil Murugan

In this project, we will explore the optical properties of novel high-Q whispering-gallery-mode microresonators, in order to demonstrate advanced, fully functional devices and sub-systems, suitable for telecom and biophotonic applications. The proposed novel microresonators include microdiscus resonators and optical bottle microresonators. The microresonators rely on novel “soften-and-squash” and “soften-and-compress” processes that have already been demonstrated. 

The various microresonators proposed here can be assembled into arrays with enhanced properties and functionality such as high-order filters, lasers and photonic molecules, which can be harnessed to engineer and improve the spectral, temporal and spatial emission characteristics of devices. Also, the microresonators can provide slow-light structures for efficient delay lines. Thin metal films can be used in conjunction with the proposed microresonators to implement and study plasmonic-based active and passive devices. In addition, this project is expected to lead to a new class of low-cost advanced photonic circuits, which integrate high-quality resonators formed from a range of advanced nonlinear glasses with passive waveguide circuits, and provide functions including lasers with purely single-moded, single-frequency and single polarisation operation, nonlinear couplers and switches, for telecommunications, sensing and spectroscopy and as seed sources for advanced LIDAR systems. 

Other areas of application include advanced and novel microfluidics and microsensor devices. The projects involve extensive microresonator fabrication, characterisation and experimental demonstrations, as well as, thorough and advanced theoretical analysis of the devices and their performance. 

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