A mechanical shutter enabled performing irradiation cycles, which from the experiments below described had 1 s duration and a pair of s darkish time separation. The probe beam originates from the small-power He-Ne laser (λ�?�?33 nm) centered into a waist of twenty µm and counter propagating with respect into the https://-lithiumniobatecrystal06294.blogzet.com/the-single-best-strategy-to-use-for-lithium-niobate-crystal-47355887