Prediction and characterisation of intensity noise of ultrafast fiber amplifiers and low noise vibrometer for biological applications
Author
Gürel, Kutan
Advisor
İlday, F. Ömer
Date
2013Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
85
views
views
20
downloads
downloads
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.