Veeragandham, Tanay (2025) Scanning and Locking an Optical Resonator. Bachelor's Thesis, Physics.
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Abstract
The aim of this experiment is to scan and characterize an optical cavity, composed of highly reflective mirrors to amplify light intensity and create regions of high optical power that are ideal for trapping and studying nanoparticles. By characterizing the cavity and locking its resonance to maximize performance, this work establishes the foundation for experiments in nanoparticle trapping. Key characteristics such as finesse and power build up factor can be used to define the stability of the setup. The finesse of the cavity was experimentally found to be 557 ± 119 indicating a well-aligned cavity with mirrors with high reflection coefficients. The reflectivity of the mirrors was found to be (99.32 − 99.56)% while the power build up factor inside the cavity was 177.3 ± 37. The second part of the experiment involved locking the cavity to the side of a TEM00 peak, which is known as Side-of-Fringe locking, using an autolocking system. The deviation of the transmitted light signal was 4.6% from the mean. It was also observed that the system was being influenced by external environmental factors which exhibits the sensitive nature of the lock. Future efforts will focus on implementing Pound-Drever-Hall locking to enhance stability and enable multiparticle trapping experiments.
| Item Type: | Thesis (Bachelor's Thesis) |
|---|---|
| Supervisor name: | Hoekstra, S. |
| Degree programme: | Physics |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 19 Feb 2025 08:04 |
| Last Modified: | 19 Feb 2025 08:04 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/34751 |
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