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      Prediction and characterisation of intensity noise of ultrafast fiber amplifiers and low noise vibrometer for biological applications

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      Author
      Gürel, Kutan
      Advisor
      İlday, F. Ömer
      Date
      2013
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      We report on the experimental characterisation and theoretical prediction of intensity fluctuations for ultrafast fibre amplifiers. We formulate a theoretical model with which the intensity noise of a Yb-doped fiber amplifier can be predicted with high accuracy, taking into account seed and pump noise, as well as generation of amplified spontaneous emission. Transfer of pump and seed signal modulations to the amplified output during fibre amplification is investigated thoroughly. Our model enables design and optimisation of fiber amplifiers with regards to their intensity noise performance. As a route to passively decreasing the noise imparted by multi-mode diodes in cladding-pumped amplifiers, we evaluate the impact of using multiple, low-power pump diodes versus a single, high-power diode in terms of the noise performance. We use this gathered intuition on intensity noise to build a low noise fibre interferometer that is able to detect sub-5 nm vibrations for biological experiments.
      Keywords
      Fiber laser
      Fiber amplifier
      Relative intensity noise
      Noise transfer function
      Permalink
      http://hdl.handle.net/11693/15955
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      • Dept. of Physics - Master's degree 160
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