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Assessment of the temperature dependence of the emission spectrum from a super luminescent diode by the use of a Fourier transform spectrometer
Umeå University, Faculty of Science and Technology, Department of Physics.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this experiment, we use a Fourier transform spectrometer to measure the spectrum of a superluminescent diode. The spectrometer is built using a Michelson interferometer with a motorized mirror in one arm of the interferometer. Another Michelson interferometer that shares the movable mirror is used to calibrate the frequency scale of the spectrometer. We use a green laser to calibrate the spectrometer and get the resolution of system of 0.4 nm. At room temperature, we measure the half width at half maximum of the diode spectrum of 14.4(4) nm and the central wavelength is 624.3(4) nm. We find that the spectrum will red shift when the temperature increases from liquid nitrogen temperature. We conclude that this red shift is due to the decrease of the band gap.

Place, publisher, year, edition, pages
2016.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-122055OAI: oai:DiVA.org:umu-122055DiVA: diva2:936863
Subject / course
Fysik C - Examensarbete
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-06-14Bibliographically approved

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