The development of ultra-broadband oscilloscopes is mainly governed by the needs of future telecom networks. But
other applications are requesting the availability of true real-time acquisition oscilloscopes. Systems able to be used in
single-shot operation are of prime interest for Inertial Confinement Fusion (ICF) and for the related R&D for plasma
We previously demonstrate a single-shot, 100GHz design of an all-optical sampling oscilloscope at 1μm (MULO). This
laboratory system has been improved in stability and compactness to make an all-in-one box prototype. More, by the
addition of an opto-electro-optics (OEO) sub-system at the input, we developed the ability to use this oscilloscope to
analyze an electrical input signal up to 60GHz. This new integrated subset also increases the range of wavelength for
optical input signal, from 300nm up to 2μm. Furthermore, it allows the use of inexpensive opto-electronic components at
telecom wavelength for this system regardless of the signal to be analysed. In parallel with these improvements, by
optimizing the heart of the system, we get a very high sampling rate, up to 500Gs/s and more; this allows considering
much higher bandwidths in the future.
In this talk, we will present latest developments and integration of this system. It will also allow us to give more details
on the innovative OEO sub-system.
A Petawatt facility called PETAL (PETawatt Aquitaine Laser) is under development near the LMJ (Laser MegaJoule) at
CEA Cesta, France. PETAL facility uses chirped pulse amplification (CPA) technique. This system needs large pulse
compression gratings exhibiting damage threshold of more than 4 J/cm2 in normal beam at 1.053μm and for 500fs
pulses. In this paper, we present our recent progress and developments of such pulse compression gratings. We have
shown in previous works that the enhancement of the near electric field inside the pillars of the grating drives the damage
threshold. This was evidenced from a macroscopic point of view by laser damage testing. We herein demonstrate that
damage morphology during damage initiation at the scale of the grating groove is also consistent with this electric field
dependence. Some recent grating designs will also be detailed.