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KESS2 Scholarship: Study of a low cost robust external cavity based speckle free diode laser

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  • Full or part time
    Dr A Roula
  • Application Deadline
    No more applications being accepted
  • Funded PhD Project (UK Students Only)
    Funded PhD Project (UK Students Only)

Project Description

Here is an exciting opportunity to study new methods of laser beam shaping which could lead to entirely new approaches in enhancing laser illumination for applications such as machine vision, metrology, and projection imaging.
The selected candidate will apply their optical simulation/experimentation skills and ambition to explore underlying physics of diode lasers with external optical feedback and their potential applications. The training and research will allow the student to develop transferable knowledge and skills in this most exciting and active field of photonics research.

Programme of research:

Laser speckle noise can produce inaccuracies in many laser based metrological applications due to the characteristically high temporal coherence exhibited in laser diodes (relative to that of broadband sources e.g. LEDs, SLEDs, incandescent lamps, etc). SLEDs were introduced to the illumination market to reduce speckle whilst maintaining a controllable laser-like beam, but exhibit limitations such as low output power and high cost.
In this research, the selected candidate will explore the optical feedback impact to the coherence of the diode laser using an external cavity scheme to reduce the speckle noises. Optical feedback of laser light into the laser diode has been used for enhancing the qualities of the laser in terms of its spectral linewidth but under some circumstances the linewidth can be extremely broadened which is known as coherence collapse (chaos). The candidate is expected to look into the phase and frequency modulation caused by the feedback injection through theoretical simulations and experimentations with aims to finally achieve a low cost robust speckle free laser diode for applications such as machine vision, projection, metrology etc. The candidate will be based within the Wireless and Optoelectronics Research and Innovation Centre (WORIC) group at the University of South Wales.

The project is backed by Global Laser Ltd, who is a specialist designer and manufacturer of laser diode modules covering a wide range of applications, including Machine Vision, Alignment, Medical, Measurement, Positioning, Scientific and Military. The factory of Global Laser Ltd is located in an attractive area of South Wales close to the Brecon Beacons National Park and covers 9500 sq/ft of engineering laboratories, machine shops and a substantial production floor space operated by highly trained employees who have in excess of 50 years electro-optics experience.

Application Process:

To download an application package, please visit: specific funded studentships:
For any queries on eligibility, please contact: KESS Team at Research and Innovation Services, University of South Wales: [Email Address Removed] Tel: 01443 482578
For informal enquiries or further programme information, please contact: Dr Ali Roula ( [Email Address Removed]).
Further information at:

Closing date for applications: midnight Thursday 12th December 2019

Funding Notes

The studentship will cover the fees for a full-time PhD programme and pay a stipend of circa £14k p.a. There is also around £9k project support costs available for consumables, travel, minor equipment, training (including the KESS Grad School) and conference attendance.

The position is available from January/April 2020.

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