Detta är ett uppsatsförslag hämtat från Nationella Exjobb-poolen. Klicka här för att komma tillbaka till samtliga exjobbsförslag.
Building an ultra-accurate optical auto-correlator
In practice, the design is a Michelson interferometer, with one fixed mirror and one scanning. The output of the interferometer is combined into a nonlinear crystal which will generate the second harmonic of the signal, i.e. the output signal is at 775 nm if the input is 1550 nm. This generation will be proportional to the sum of the signal
through the two arms, which means that is there is an offset in path length, there will be a signal that can be immediately transformed to the autocorrelation of the input signal.
The design we have in mind gives more options than a commercial. For increased accuracy, the path-length in the scanning arm should be monitored with a red pilot laser (HeNe or diode? It is for the project to decide). Finally, the output of the SHG is connected to a Photo-Multiplier Tube. However, the design must be flexible enough to replace this PMT with a monochromator, for spectral analysis of the SHG autocorrelation trace.
The master thesis project contains:
• Building the autocorrelator; there is a mechanical shop at SP for metal works. Optical components must be specified and ordered
• Programming the control-computer: Windows environment, anything from Visual Basic or Python to LabVIEW. If Linux environment is preferred this can also be arranged.
• Evaluating the performance; resolution, accuracy.
Minimum requirements of a successful applicant:
Master level course in fundamental optics e.g. any of the four courses given by the photonics lab at
MC2/Chalmers, or equivalent
An interest both for practical construction and simple programming
A genuine interest in optics and photonics
Informationen om uppsatsförslag är hämtad från Nationella Exjobb-poolen.