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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.48: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Temperature and frequency stabilisation in a cryogenic confocal microscope for single-site experiments — •Jan M. Binder, Lachlan J. Rogers, and Fedor Jelezko — Institute for Quantum Optics and IQST, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany

During our experiments on single-site crystal defects at liquid helium temperatures we have noticed that the spatial stability of our cryogenic confocal microscope is influenced significantly by the temperature of the surrounding laboratory. To a lesser extent this also applies to the frequency stability of the associated laser system.

We present a solution to the temperature stability problem of in the form of a cost-effective high current PID controller and thermoelectric temperature regulation.

We also show an approach to laser stabilisation combining multiple feedback signals of different inherent accuracy and sampling rates with the goal of enabling multi-hour measurements of fluorescence signals at low excitation power.