University of St Andrews

Key information

SCOTCAT credits : 15

ECTS credits : 7

Level : SCQF level 11

Semester: 1

Availability restrictions: Normally only taken in the final year of an MPhys or MSci programme involving the School

Quantitative treatment of laser physics including rate equations; transient/dynamic behaviour of laser oscillators including relaxation oscillations, Q-switching, cavity dumping and mode locking, single-frequency selection and frequency scanning, design analysis of optically-pumped solid state lasers, laser amplifiers and optical resonators. An emphasis is placed on how understanding of laser physics can be used to design useful laser systems.

Relationship to other modules

Pre-requisite(s): Before taking this module you must pass PH3007 and pass PH3061 and pass PH3062

Anti-requisite(s): You cannot take this module if you take PH4034

Learning and teaching methods and delivery

Weekly contact: 3 lectures or tutorials

Scheduled learning hours: 30

Guided independent study hours: 120

Assessment pattern

As used by St Andrews: 2.5-hour open-notes Written Examination = 80%, Coursework = 20%


Re-assessment: Oral Re-assessment, capped at grade 7

Personnel

Additional information from school

Overview

The course is designed to introduce the student to the classical treatment of laser physics providing the necessary quantitative techniques to permit design and prediction. A rate-equation model is used to model the laser system. In this course a number of variations are explored with regard to their applicability and limitations. The design of optical resonators for a variety of applications is discussed. Learning is assisted through the incorporation into the course of animations and numerical modelling material. (The latter is the 'Psst' software, which may be downloaded free for personal use.)

Aims & Objectives

The course aims to develop a working knowledge and conceptual understanding of important topics in contemporary laser physics at a quantitative level. A key objective is to enable the student to undertake quantitative problem-solving relating to the design, performance and applications of lasers through thereby acquiring an ability to put such knowledge into practice by way of numerical calculations. The aim throughout is to provide a thorough grounding in basic principles and their application, so that by the end of the course the student will have acquired a range of essential skills and knowledge required by a practitioner of laser physics and engineering. Such knowledge of the basics will be of enduring value and relevance. It will enable the student to innovate, design and analyse laser devices and systems at a quantitative level. As well as developing the conceptual framework the course also aims to give a sound perspective of contemporary trends and developments in laser physics, particularly with regard to new schemes for the generation of coherent electromagnetic radiation and the associated devices.

Learning Outcomes

You will have acquired:

• A conceptual understanding of the classical approach to laser physics.
• An ability through a thorough grounding in the rate equation approaches to analyse quantitatively the steady-state and dynamical performance of important contemporary laser devices.
• A comprehensive knowledge, including of recent developments, concerning: solid-state lasers (including diode-laser pumped devices), semiconductor lasers, fibre lasers, vibronic and other tuneable lasers, and newly emerging gain media.
• An ability to both analyse quantitatively and to design such lasers.
• A conceptual understanding of such important aspects of laser active media as linewidth determining processes, dispersive/gain properties, spatial and frequency hole-burning.
• An ability to both describe quantitatively and analyse such effects.
• A thorough grounding in the principles and design of laser resonators, particularly stable cavities. - An ability to analyse quantitatively and design such cavities by using matrix techniques.
• Access to and familiarity with numerical modelling tools (including 'Psst') relating to many aspects of laser design and performance.

Synopsis

• Rate Equation Approach to Laser - Steady-State behaviour
• Transient effects
• Relaxation Oscillations
• Q-switching
• Diode-laser-pumped solid-state lasers
• Linear Gain Regime
• Power Extraction
• Dispersion & Gain in Laser
• Mode Effects
• Review of Stable Optical Resonators
• Matrix Techniques
• Applications
• Fibre Lasers
• Vibronic Lasers
• Tuning Techniques
• Linewidth Control
• Frequency Stabilisation
• Semiconductor Lasers
• Ultrafast lasers and diagnostic techniques

Additional information on continuous assessment etc.

Please note that the definitive comments on continuous assessment will be communicated within the module.  This section is intended to give an indication of the likely breakdown and timing of the continuous assessment.

The first part of the module looks at the key underlying ideas of laser physics.  After an introduction we look at laser gain.  We then turn our attention to laser modes, both longitudinal and transverse.  There follows a treatment of time dependence in lasers, based on coupled rate equations, and taking in relaxation oscillations and Q-switching.  The remainder of the module looks at how all these ideas can be applied to understand and design various laser systems including ultrashort pulse lasers and semiconductor diode lasers.  Tutorials provide a way to practice using these ideas and to discuss questions.  A group-based laser design case study with associated feedback allows a more in-depth exploration of design of a particular laser system.

Laser Design Case Study          20%

Open Notes Examination           80%

Recommended Books

Please view University online record: https://sta.rl.talis.com/index.html