Optical-fibre passively mode locked laser generator with non-linear polarization switching
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United States of America Patent
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Mar 5, 1996
Grant Date -
N/A
app pub date -
Sep 15, 1994
filing date -
Sep 16, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A passively-mode-locked laser generator having an active optical fibre and fibre pumping means adapted to cause the generation of an emission signal in the fibre, a polarization control means, signal extraction means and at least one optical component with transmissiveness depending on polarization is disclosed. The components are inserted in an optical fibre path that, for a pumping energy lower than a predetermined value corresponding to a linear propagation condition of the signal, gives rise to a polarization rotation of the emission signal through an angle causing the extinction of the signal itself within the optical component with transmissiveness depending on polarization. For a pumping energy of a higher power than the predetermined value, the generator causes a polarization rotation of the emission signal through an angle corresponding to the transmission with low losses of only pulses of high peak power of the emission signal.
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