We report the first experimental demonstration of an optical fiber supporting a fundamental mode with flattened intensity
profile around 1050 nm. The design has been defined through intensive numerical simulations by paying a special
attention to the constraints imposed by the fabrication process. We show that the fabricated fiber presents a single-mode
behaviour.
We report on dual-stage fibered Master Oscillator Power Amplifier system designed to meet stringent requirements of
large-scale laser facilities front-end sources. The combination of high power continuous wave laser and electro-optical
modulator allows the generation of multi-kHz nanosecond pulses with accurate tailored temporal pulse profiles. The seed
pulses are amplified in a preamplifier to achieve 20 μJ pulse energy (33 dB gain) launched inside the power amplifier.
We finally obtained a strictly single mode beam, narrow-bandwidth, multi-kHz nanosecond pulse amplification at mJ
level, with more than 50 dB optical signal-to-noise ratio, 15 dB polarization extinction ratio and sub-nanosecond
resolution temporal shaping. The choice of optimal parameters and the temporal pulse shaping have been performed
thanks to numerical simulations (including forward and backward amplified spontaneous emission) in excellent
agreement with the results.
We present a fibered master oscillator power amplifier system which allows generation of multi-μJ narrow-bandwidth
few nanosecond pulses with active pulse shape control. Temporal shaping is demonstrated with sub-nanosecond
resolution and high dynamic. In order to precompensate gain saturation, input optimal pulse shaping is calculated using a
numerical model including ASE and feed-back algorithm.
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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