Time resolved spectral analysis for pulsed lasers nonlinear effects characterization

Patrick Beaure d'Augères; Alain Mugnier; David Pureur; Thierry Chartier

doi:10.1117/12.853794

4 June 2010 Time resolved spectral analysis for pulsed lasers nonlinear effects characterization

Patrick Beaure d'Augères, Alain Mugnier, David Pureur, Thierry Chartier

Proceedings Volume 7728, Nonlinear Optics and Applications IV; 77280S (2010) https://doi.org/10.1117/12.853794
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

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.

Citation Download Citation

Patrick Beaure d'Augères, Alain Mugnier, David Pureur, and Thierry Chartier "Time resolved spectral analysis for pulsed lasers nonlinear effects characterization", Proc. SPIE 7728, Nonlinear Optics and Applications IV, 77280S (4 June 2010); https://doi.org/10.1117/12.853794

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KEYWORDS

Modulation

Pulsed laser operation

Modulators

Kerr effect

Continuous wave operation

Fiber lasers

Superluminescent sources

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