KEYWORDS: Modulation, Pulsed laser operation, High power lasers, Beam splitters, Laser systems engineering, CCD cameras, Mirrors, Solid state lasers, National Ignition Facility, Fluctuations and noise
It is well known that small-scale self-focusing is one of the major factors to restrict the capability and efficiency of
high-power solid-state laser driver. B-integral is used to measure the severity extent of small-scale self-focusing and the
typical value of B-integral is less than 1.8 in narrow band high power laser by NIF. We experimentally obtained the
relationship of B-integral with spatial contrast for broadband pulse in case of active modulation and random noise
modulation, and found that the growth of contrast is still very slow after B-integral up to 1.8 for 12 nm ultrashort pulse
laser. So we can consider that the broadband laser is able to unloosen B-Integral criterion and then improve the system
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