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- Published: 17th September 2026
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Personal statement example
My physics degree gave me a broad foundation, but the parts I returned to again and again were those where light behaved in ways that were easy to demonstrate and surprisingly hard to calculate. I want to study optics at postgraduate level in order to move from understanding standard results to being able to design, model and measure optical systems properly.
My final-year project was a modest but instructive one: characterising a Michelson interferometer assembled from components already held in the department. The aim was to measure the coherence length of two sources, a helium-neon laser and a filtered white-light source, and to compare the observed fringe visibility with predictions from the source spectra. Much of the work turned out to be practical rather than theoretical. Mechanical drift in the translation stage, air currents from the ventilation and the alignment of the beamsplitter all affected the results more than I had expected, and I spent several weeks improving the mounting and shielding before the data became repeatable. I learned to record alignment procedures carefully, to estimate uncertainties honestly rather than optimistically, and to model the instrument in Python so that I could see which parameters my measurements were actually sensitive to. The final report included a straightforward Fourier treatment linking visibility to source bandwidth, which matched the white-light results reasonably well and the laser results very closely.
Alongside my degree I have read fairly widely outside the syllabus. Hecht's Optics was my main reference during the project, and I worked through the chapters on partial coherence and on aberrations more thoroughly than my course required. More recently I have been reading about Fourier optics and spatial filtering, and have tried to reproduce simple diffraction calculations numerically, comparing single- and double-slit patterns from my own code against measurements taken on an optical bench at the college where I work. The agreement is good enough to be satisfying and imperfect enough to be interesting.
My interest is also rooted in something more hands-on. For several years I have done amateur astrophotography with a second-hand refractor, which has taught me a great deal about focal ratios, chromatic aberration, seeing conditions and the trade-offs between aperture and practicality. Stacking short exposures to reduce noise was my first real encounter with signal-to-noise reasoning, well before I met it formally. I have also spent many Saturdays helping my uncle in his workshop, where he still measures and sorts lens blanks for interest. Using a lensometer, checking curvatures and discussing why particular prescriptions are made up in a particular way gave me an early feel for lens design as a craft with real constraints, not only a set of thin-lens equations.
Since graduating I have worked part-time as an assistant to a laboratory technician in a further education science department, preparing practicals, maintaining equipment and occasionally rebuilding demonstration setups that have drifted out of alignment. It is ordinary work, but it has made me methodical, and explaining why an experiment is not working to a class of sixteen-year-olds is good practice in clear reasoning.
I am particularly keen to develop stronger skills in optical design software, in coherence and polarisation theory, and in laboratory metrology, and I would welcome a project involving interferometric measurement or imaging system characterisation. In the longer term I would like to work in instrumentation, either in industry or supporting research, where careful optical measurement is the substance of the job rather than a preliminary to it.
Why this example works — strengths and ways to improve
This is a credible, well-grounded statement for a taught or research-oriented optics master's. Your Michelson project carries real weight because you describe obstacles, method and limits honestly. Hobbies and technician work are used as evidence rather than decoration. The main gaps are an underdeveloped account of degree-level coursework and a closing that could connect your stated aims more tightly to prior evidence.
Subject motivation
easy to demonstrate and surprisingly hard to calculate
This opening gives a specific intellectual reason for choosing optics rather than a vague passion claim. It also sets up the statement's recurring theme of measurement versus model. You could make the motivation sharper by naming which kind of calculation first defeated you, so the contrast feels earned rather than general.
Academic preparation
worked through the chapters on partial coherence and on aberrations
Independent reading in Hecht and your numerical diffraction work show initiative. However, you say almost nothing about taught modules, mathematical methods or electromagnetism from your degree. A sentence on relevant coursework would help readers judge your readiness for advanced theory, which supports your stated wish to study coherence and polarisation.
Evidence and reflection
estimate uncertainties honestly rather than optimistically
This is genuine reflection, not a generic skill claim. It follows directly from the drift, air currents and alignment problems you describe. Your Python sensitivity modelling also shows method. The only weaker spot is reasonably well for white light: briefly explaining why that agreement was poorer would deepen the analysis.
Relevant experience
rebuilding demonstration setups that have drifted out of alignment
The technician role is ordinary but relevant: alignment, maintenance and bench measurements connect directly to metrology aims. Astrophotography convincingly introduces signal-to-noise reasoning. The uncle's workshop is plausible but thinner; keep only the detail that shows a distinct insight, since lens constraints partly overlap with your astrophotography paragraph.
Credibility and voice
good enough to be satisfying and imperfect enough to be interesting
Your voice is measured and believable. Words like modest and ordinary avoid exaggerated authority, and the claims match a recent graduate's stage. This line is memorable without being ornate. Just make sure understatement does not undersell work. Modest but instructive could be cut, since the project description already demonstrates its value.
Structure and format
I would welcome a project involving interferometric measurement
The sequence moves logically from motivation to project, reading, practical experience and aims. Paragraphs stay focused. The conclusion states aims clearly but feels like a list. Linking design software or polarisation to a specific limitation you met earlier would give the ending stronger coherence. For a real application, tailor this to the programme's actual project options.
What you’ve done well
- The interferometer paragraph shows concrete method, practical obstacles, honest uncertainty treatment and a model compared against data.
- Self-directed numerical diffraction work tested against your own bench measurements demonstrates readiness for independent work.
- Everyday experiences are used as evidence of specific reasoning rather than as a list of activities.
How this draft could improve
- Add one or two sentences on relevant degree coursework or mathematical preparation so readiness for advanced theory is visible.
- Explain briefly why the white-light results matched less well than the laser results, turning a passing remark into analysis.
- Tie each future skill in your final paragraph to a gap you identified in earlier experience.