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Year of entry: 2021
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Course unit details:
Lasers and Photonics
|Unit level||Level 3|
|Teaching period(s)||Semester 1|
|Offered by||Department of Physics & Astronomy|
|Available as a free choice unit?||No|
Lasers and Photonics
|Unit title||Unit code||Requirement type||Description|
|Introduction to Photonics||PHYS20612||Pre-Requisite||Compulsory|
This course follows on from PHYS20612, thereby providing a solid background for the physics and operation of different types of lasers and photonic principles, together with examples of their use in scientific research.
This course unit detail provides the framework for delivery in 21/22 and may be subject to change due to any additional Covid-19 impact. Please see Blackboard / course unit related emails for any further updates
On completion of the course, students will be able to:
1. Demonstrate how a laser operates, and how optical feedback is used to ensure lasing.
2. Explain line broadening and how this is of relevance to laser operation.
3. Demonstrate how the concepts of laser thresholds, gain and the oscillation conditions can be derived using rate equations.
4. Review multi-mode laser operation, including higher order cavity modes.
5. Describe the operation and output characteristics of a selection of laser sources.
6. Review applications of lasers and photonics in scientific research.
1. Basic laser physics: Einstein A and B coefficients; induced and spontaneous transitions; systems in thermal equilibrium; population inversion.
2. Homogeneous and inhomogeneous broadening: Doppler; natural; pressure; Gaussian and Lorentzian lineshapes and widths, the Voigt Profile.
3. Develop the processes that lead to lasing from a single atom – laser field interaction using density matrices, through to the solutions for many atoms in a gain medium.
4. Gain saturation: homogeneous and inhomogeneous; saturation intensity.
5. Laser oscillation: oscillation conditions; threshold conditions; passive cavity frequencies.
6. 3 and 4 level lasers: power to maintain threshold, output coupling & optimization.
7. Multi-mode laser oscillation.
8. Laser cavities and modes: Gaussian modes; high order transverse modes; frequencies of oscillation; Laguerre-Gaussian modes, mode stability.
9. Examples of different laser systems: CW, pulsed, tunable.
10. Applications and examples of lasers & photonics used in research.
Feedback & exercises will be available through examples presented during the lectures together with answers available via Blackboard, and through working through the solution of selected examples in the lectures.
Milloni, P.W. & Eberly, J.H. Lasers
Saleh, B.E.A., Teich, M.C. Fundamentals of Photonics (Wiley)
Siegman, A.E. Lasers (University Science Books)
Smith, F.G. & King, T.A. Optics and Photonics: An introduction (Manchester Physics)
Wilson, J. & Hawkes, J.F.B. Optoelectronics: An introduction (Prentice Hall)
Yariv, A. Introduction to Optical Electronics (Wiley)
|Scheduled activity hours|
|Assessment written exam||1.5|
|Independent study hours|
|Mark Dickinson||Unit coordinator|