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Communication Dans Un Congrès Année : 2010

Time-resolved spectral analysis for nonlinear effects characterization in pulsed lasers

Résumé

We demonstrate a simple method to measure the evolution of nonlinear effects along a pulse. An all-fiber acousto-optic modulator is synchronized to the pulse emission and inserted between the laser output and an optical spectrum analyzer. Thanks to this configuration, the application of a short modulator opening time (10 ns typically) compared to the pulse width (100 ns typically) forms a spectral measurement window. This window is shifted along the pulse by the use of a variable trig delay. The optical spectrum is measured for each position of the window. The nonlinear effects evolution versus the instantaneous power can be characterized. To validate our method, we have analyzed the spectral evolution along 100 ns pulses from different fiber laser sources. We have observed that the spectral broadening due to Kerr effect appears first. Raman scattering occurs next for window positions corresponding to highest peak powers. Finally during the trailing edge course, nonlinear effects disappear in the reverse order of their apparition. This method has also been extended to measure the power inside and outside a pulse in order to deduce the rate of amplified spontaneous emission.
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Dates et versions

hal-00496526 , version 1 (30-06-2010)

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Patrick Beaure d'Augères, Alain Mugnier, David Pureur, Thierry Chartier. Time-resolved spectral analysis for nonlinear effects characterization in pulsed lasers. SPIE Photonics Europe 2010, Apr 2010, Bruxelles, Belgium. pp.77280S, ⟨10.1117/12.853794⟩. ⟨hal-00496526⟩
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