3 September 2008 A two-pass Sagnac loop for high-contrast ultrafast switching at 1053nm
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An original polarization - maintaining Sagnac switch is proposed for use in optical sampling and short pulse measurement applications, in the range of signal wavelengths of interest for Inertial Confinement Fusion. Our design is implemented using highly-nonlinear photonic-crystal fibres. It enables the search of huge switching contrasts together with very large sampling bandwidths, in relationship with an elevated temporal resolution. A unique two-pass Sagnac loop is fed with input signal pulses at 1053nm while triggered with pump pulses at 1550nm. Starting from a single-pass contrast and a temporal resolution in the ranges of 30dB and of a couple of picoseconds, the two-pass architecture provides optical contrasts in excess of 45dB and sub-picosecond gating durations. Thanks to two-pass operation, we can get nearly free from any environmental perturbation. Furthermore the spectral and the temporal clipping features related to switching are analyzed using comprehensive modeling with higher order dispersion effects. The issue of the optimization of the sampling bandwidth is discussed in details by means of the synchronization of the pump return, which involves a sub-picosecond precision. This way, the output energy from the switch can be kept constant and proportional to the signal power, whatever the input pulse width. The sampling bandwidth then extends up to RF frequencies in the range 300-500GHz.
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A. Jolly, A. Jolly, L. Lago, L. Lago, S. Jonathas, S. Jonathas, J. Luce, J. Luce, H. Coic, H. Coic, J. F. Gleyze, J. F. Gleyze, P. Le Boudec, P. Le Boudec, N. Traynor, N. Traynor, "A two-pass Sagnac loop for high-contrast ultrafast switching at 1053nm", Proc. SPIE 7072, Optics and Photonics for Information Processing II, 707207 (3 September 2008); doi: 10.1117/12.801141; https://doi.org/10.1117/12.801141

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