Study on the optical limiting properties of the mixed liquid of carbon black suspensions and green tea solution by multi-pulse laser

The optical limiting properties of the mixed liquid of carbon blacksuspensions (CBS) and green tea solution were studied by using an 8ns laser pulse at 532,nm. The optical limiting effects of the CBSand mixed liquid have been compared between 5 and 10,Hz repetitionfrequencies with nanosecond laser pulse. The experimental resultsindicate that the optical limiting threshold of the sample with theincidence laser at 10,Hz repetition frequency is lower than at5,Hz repetition frequency. The possible reasons for the influenceof the repetition frequency on the samples are discussed. And byobserving the optical radiant distributions when the laser pulsepassing through different samples, a possible mechanism for theobserved effects is suggested. At the same time, the result showsthat the optical limiting of CBS is the dominant factor to opticallimiting of the mixed liquid.