Amplified noise nonstationarity in a mode-locked laser based on nonlinear polarization rotation

Beat note measurements between a mode-locked (ML) and a continuous-wave laser, as well as between two ML sources, were used to demonstrate that the sub-threshold, cavity filtered, amplified spontaneous emission is not stationary, even when a fast mode-locking mechanism, such as nonlinear polarizatio...

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Bibliographic Details
Published in:Optics letters 2019-11, Vol.44 (21), p.5137-5140
Main Authors: Perilla Rozo, Carlos Andres, Guay, Philippe, Deschênes, Jean-Daniel, Genest, Jérôme
Format: Article
Language:English
Subjects:
Amplification
Continuous wave lasers
Laser applications
Laser mode locking
Modulation
Polarization
Rotation
Short pulses
Spontaneous emission
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Summary:Beat note measurements between a mode-locked (ML) and a continuous-wave laser, as well as between two ML sources, were used to demonstrate that the sub-threshold, cavity filtered, amplified spontaneous emission is not stationary, even when a fast mode-locking mechanism, such as nonlinear polarization rotation, is used to generate short pulses. A relatively small gain modulation of a few percent created by high-intensity pulses can produce a significant modulation of the amplified noise once synchronously accumulated over several cavity round-trips, even if the repetition rate is faster than the gain dynamics.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.44.005137