PH32050: Laser physics
[Page last updated: 23 April 2025]
| Academic Year: | 2025/26 |
| Owning Department/School: | Department of Physics |
| Credits: | 5 [equivalent to 10 CATS credits] |
| Notional Study Hours: | 100 |
| Level: | Honours (FHEQ level 6) |
| Period: |
- Semester 2
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| Assessment Summary: | EXOB 100% |
| Assessment Detail: |
- Written examination (EXOB 100%)
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| Supplementary Assessment: |
- Like-for-like reassessment (where allowed by programme regulations)
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| Requisites: |
Before taking this module you must take PH22006 OR ( take AT LEAST 1 MODULE FROM {PH20013, PH20060} AND take AT LEAST 1 MODULE FROM {PH20014, PH20061} AND take AT LEAST 1 MODULE FROM {MA20223, PH20107} )
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| Learning Outcomes: |
After taking this unit, the student should be able to:
芒锟铰xplain how light interacts with atoms in excited states, and how this can lead to stimulated emission and lasing;
芒锟铰heoretically design simple laser resonators;
芒锟铰nalyse continuous and pulsed lasers and discuss how laser pulses are formed;
芒锟铰ompare the properties of different materials for use in practical lasers;
芒锟铰escribe the state-of-the-art in laser technology and applications.
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| Synopsis: | You will learn the theoretical background underpinning laser action and explore how this is achieved in real lasers. You will develop your understanding of the practical considerations of power, efficiency and robustness in real lasers. You will also see how ultrashort laser pulses are generated and measured, and will explore some research-led topics in the development and application of lasers.
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| Content: | Interaction of light with matter (2 hours): Absorption, spontaneous and stimulated emission; line shape and broadening mechanisms; population inversion.
Conditions for oscillation (2 hours): Gain in 3 and 4 level systems, gain saturation; introduction to laser cavities, lasing threshold, output power in lasers above threshold, gain clamping, laser efficiency.
Optical beams and resonators (4 hours): Ray vectors and matrices, Gaussian beams; Rayleigh length, beam waist, phase front curvature; optical resonators with mirrors, in fibre, and integrated cavities; Q factor and cavity lifetime.
CW lasers (4 hours): Examples of specific modern lasers and pumping mechanisms.
Pulsed lasers (5 hours): Q-switching and modelocking; time-bandwidth product for pulses; dispersion; autocorrelation; chirped pulse amplification.
Current research topics (3 hours): Research-led topics in the development or application of lasers.
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| Course availability: |
PH32050 is Optional on the following courses:
Department of Chemistry
- USSC-AFB10 : BSc(Hons) Natural Sciences (Biology with Physics) (Year 3)
- USSC-AFB10 : BSc(Hons) Natural Sciences (Chemistry with Physics) (Year 3)
- USSC-AKB01 : BSc(Hons) Natural Sciences (Chemistry with Physics stream) with Year long work placement (Year 4)
- USSC-AFB10 : BSc(Hons) Natural Sciences (Physics with Biology) (Year 3)
- USSC-AFB10 : BSc(Hons) Natural Sciences (Physics with Chemistry) (Year 3)
- USSC-AAB01 : BSc(Hons) Natural Sciences (Physics with Chemistry stream) with Study year abroad (Year 4)
- USSC-AKB01 : BSc(Hons) Natural Sciences (Physics with Chemistry stream) with Year long work placement (Year 4)
- USSC-AFM10 : MSci(Hons) Natural Sciences (Biology with Physics) (Year 3)
- USSC-AAM01 : MSci(Hons) Natural Sciences (Biology with Physics stream) with Study year abroad (Year 4)
- USSC-AFM10 : MSci(Hons) Natural Sciences (Chemistry with Physics) (Year 3)
- USSC-AAM01 : MSci(Hons) Natural Sciences (Chemistry with Physics stream) with Study year abroad (Year 4)
- USSC-AKM01 : MSci(Hons) Natural Sciences (Chemistry with Physics stream) with Professional Placement (Year 4)
- USSC-AFM10 : MSci(Hons) Natural Sciences (Physics with Biology) (Year 3)
- USSC-AAM01 : MSci(Hons) Natural Sciences (Physics with Biology stream) with Study year abroad (Year 4)
- USSC-AKM01 : MSci(Hons) Natural Sciences (Physics with Biology stream) with Professional Placement (Year 4)
- USSC-AFM10 : MSci(Hons) Natural Sciences (Physics with Chemistry) (Year 3)
- USSC-AAM01 : MSci(Hons) Natural Sciences (Physics with Chemistry stream) with Study year abroad (Year 4)
- USSC-AKM01 : MSci(Hons) Natural Sciences (Physics with Chemistry stream) with Professional Placement (Year 4)
Department of Physics
- USPH-AFB26 : BSc(Hons) Mathematics and Physics (Year 3)
- USXX-AAB04 : BSc(Hons) Mathematics and Physics with Study year abroad (Year 4)
- USXX-AKB04 : BSc(Hons) Mathematics and Physics with Year long work placement (Year 4)
- USPH-AFB20 : BSc(Hons) Physics (Year 3)
- USPH-AAB02 : BSc(Hons) Physics with Study year abroad (Year 4)
- USPH-AKB02 : BSc(Hons) Physics with Year long work placement (Year 4)
- USPH-AFB22 : BSc(Hons) Physics with Astrophysics (Year 3)
- USPH-AAB10 : BSc(Hons) Physics with Astrophysics with Study year abroad (Year 4)
- USPH-AKB10 : BSc(Hons) Physics with Astrophysics with Year long work placement (Year 4)
- USPH-AFB24 : BSc(Hons) Physics with Theoretical Physics (Year 3)
- USPH-AAB16 : BSc(Hons) Physics with Theoretical Physics with Study year abroad (Year 4)
- USPH-AKB16 : BSc(Hons) Physics with Theoretical Physics with Year long work placement (Year 4)
- USPH-AFM20 : MPhys(Hons) Physics (Year 3)
- USPH-AAM12 : MPhys(Hons) Physics with Study year abroad (Year 4)
- USPH-AKM03 : MPhys(Hons) Physics with Professional Placement (Year 4)
- USPH-AKM04 : MPhys(Hons) Physics with Professional and Research Placements (Year 4)
- USPH-AFM22 : MPhys(Hons) Physics with Astrophysics (Year 3)
- USPH-AAM14 : MPhys(Hons) Physics with Astrophysics with Study year abroad (Year 4)
- USPH-AKM10 : MPhys(Hons) Physics with Astrophysics with Professional Placement (Year 4)
- USPH-AKM11 : MPhys(Hons) Physics with Astrophysics with Professional and Research Placements (Year 4)
- USPH-AFM23 : MPhys(Hons) Physics with Astrophysics with research placement (Year 3)
- USPH-AAM15 : MPhys(Hons) Physics with Astrophysics with Study year abroad and Research Placement (Year 4)
- USPH-AFM21 : MPhys(Hons) Physics with research placement (Year 3)
- USPH-AAM13 : MPhys(Hons) Physics with Study year abroad and Research Placement (Year 4)
- USPH-AFM24 : MPhys(Hons) Physics with Theoretical Physics (Year 3)
- USPH-AAM16 : MPhys(Hons) Physics with Theoretical Physics with Study year abroad (Year 4)
- USPH-AKM16 : MPhys(Hons) Physics with Theoretical Physics with Professional Placement (Year 4)
- USPH-AKM17 : MPhys(Hons) Physics with Theoretical Physics with Professional and Research Placements (Year 4)
- USPH-AFM25 : MPhys(Hons) Physics with Theoretical Physics with research placement (Year 3)
- USPH-AAM17 : MPhys(Hons) Physics with Theoretical Physics with Study year abroad and Research Placement (Year 4)
- USPH-AFM26 : MSci(Hons) Mathematics and Physics (Year 3)
- USXX-AAM01 : MSci(Hons) Mathematics and Physics with Study year abroad (Year 4)
- USXX-AKM01 : MSci(Hons) Mathematics and Physics with Year long work placement (Year 4)
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Notes: - This unit catalogue is applicable for the 2025/26 academic year only. Students continuing their studies into 2026/27 and beyond should not assume that this unit will be available in future years in the format displayed here for 2025/26.
- 好色tv and units are subject to change in accordance with normal University procedures.
- Availability of units will be subject to constraints such as staff availability, minimum and maximum group sizes, and timetabling factors as well as a student's ability to meet any pre-requisite rules.
- Find out more about these and other important University terms and conditions here.
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