George Stewart


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Personal profile

Research Interests

My current research interests are in the following areas:

  • Evanescent wave devices
  • Optical fibre sensors
  • Near-IR optical gas sensors
  • Diode laser spectroscopy
  • Photo-acoustic spectroscopy
  • Fibre lasers
  • Multi-wavelength fibre lasers
  • Fibre laser spectroscopy
  • Cavity-enhanced spectroscopy
  • Intra-cavity and ring-down spectroscopy

Personal Statement

I have been a member of the EEE Department since 1985 as part of the Optoelectronics Research Group, now the Centre for Microsystems and Photonics. Prior to this, I worked on integrated optics research at Glasgow University for fibre optic communication systems. Since 1985, my research has involved areas such as fibre optic components, evanescent wave sensors, laser spectroscopy, photoacoustic spectroscopy and fibre laser systems.

I have taught several undergraduate courses including analogue and digital electronics and supervised many undergraduate projects in photonics. Over the years I have been closely involved with the management of the joint undergraduate course in electrical and mechanical engineering and currently I am deputy chair of the departmental courses and teaching committee. 

My research is in the area of "photonics", which is the science and application of light, taking advantage of both the wave and photon nature of light for a wide variety of applications. Initially my research was focussed on photonics for optical communication systems and then later on optical sensors, particularly the use of lasers for absorption spectroscopy in detecting gases such as methane, carbon dioxide, etc. The high spectral density and tunability of near infra-red lasers make them ideal sources in spectroscopy and the use of fibre optics and components from the communications industry bring the added dimensions of flexibility and remote sensing.  

Expertise & Capabilities

I have particular expertise in the following areas:

Fibre optic systems for absorption spectroscopy

DFB lasers for spectroscopy applications

Dynamics of fibre lasers for ring-down and intracavity spectroscopy

Evanescent field devices


Industrial Relevance

Some of the areas where the research has led to industrial applications include:

Fibre optic methane sensors for monitoring of land-fill sites, mines and energy generation plants based on methane (OptoSci Ltd)

Gas monitoring and emissions control for fuel cells and gas turbine engines (Rolls Royce)

Teaching Interests

I have taught courses in analogue and digital electronics, optical waveguides, fibre optics, optical communication systems and photonics.

Academic / Professional qualifications

I graduated from Glasgow University with a Bachelor of Science (1st Class Honours Degree) in 1974 and then with a PhD degree in 1979 for research in integrated optics. I am currently a member of the Optical Society of America and the Institute of Physics.

Education/Academic qualification

Doctor of Philosophy, University of Glasgow

Bachelor of Science, University of Glasgow

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Projects 2007 2021

Research Output 1998 2018

1 Citation (Scopus)
11 Downloads (Pure)

A new RAM normalized 1f-WMS technique for the measurement of gas parameters in harsh environments and a comparison with 2f/1f

Upadhyay, A., Lengden, M., Wilson, D., Humphries, G. S., Crayford, A. P., Pugh, D. G., Johnson, M. P., Stewart, G. & Johnstone, W., 27 Nov 2018, In : IEEE Photonics Journal. 10, 6, 12 p., 6804611.

Research output: Contribution to journalArticle

Open Access
Random access storage
8 Citations (Scopus)
165 Downloads (Pure)
Open Access
Distributed feedback lasers
Surface emitting lasers

Activities 2008 2010

  • 1 Participation in conference
  • 1 Journal peer review
  • 1 Examination

Fourth European Workshop on Optical Fibre Sensors

George Stewart (Member of programme committee)
8 Sep 201010 Sep 2010

Activity: Participating in or organising an event typesParticipation in conference

External examiner for PhD, University of Glasgow

George Stewart (External Examiner)
Apr 2010

Activity: Examination typesExamination