The ultrashort pulse laser writing multi-layered data bits in fused silica for three-dimensional optical data storage through the mechanism of optical damage induced by multi-photon absorption is demonstrated.The 800 ...The ultrashort pulse laser writing multi-layered data bits in fused silica for three-dimensional optical data storage through the mechanism of optical damage induced by multi-photon absorption is demonstrated.The 800 nm,120 fs Ti:Sapphire laser beam is focused into cubic samples with a 0.65 NA commercial microscope objective.The size of the recorded bits can be smaller than 0.5 × 0.5 × 2.5μm as the laser pulse energy is lower than 300 nJ and the corresponding bit data storage density is 0.2 × 10^(12) Tbits/cm^(3).Due to the aberration produced by the mismatch of the refractive indices between the recording material and its immersion medium,the longitudinal size of the recorded bit increases and the contrast of the bit to surrounding uninfected zone decreases as the bit plane gets deeper.Hence a relatively lower storage density of 0.05 × 10^(12) Tbits/cm3 is realized.展开更多
When a powerful femtosecond laser pulse was tightly focused into a bulk quartz,plasma generation occurred only in a very small focal volume.This extremely confined interaction led to an explosive expansion and generat...When a powerful femtosecond laser pulse was tightly focused into a bulk quartz,plasma generation occurred only in a very small focal volume.This extremely confined interaction led to an explosive expansion and generated a sub-micrometre void with a diameter as small as 200-300nm.The dependence of the size of the void on the laser energy or pulse duration was investigated and the mechanism of this process was associated dominantly with the multiphoton ionization.展开更多
基金Supported by National Kay Basic Research Special Foundation under Grant No.G1999075207National Natural Science Foundation of China under Grant Nos.19884001 and 19525412.
文摘The ultrashort pulse laser writing multi-layered data bits in fused silica for three-dimensional optical data storage through the mechanism of optical damage induced by multi-photon absorption is demonstrated.The 800 nm,120 fs Ti:Sapphire laser beam is focused into cubic samples with a 0.65 NA commercial microscope objective.The size of the recorded bits can be smaller than 0.5 × 0.5 × 2.5μm as the laser pulse energy is lower than 300 nJ and the corresponding bit data storage density is 0.2 × 10^(12) Tbits/cm^(3).Due to the aberration produced by the mismatch of the refractive indices between the recording material and its immersion medium,the longitudinal size of the recorded bit increases and the contrast of the bit to surrounding uninfected zone decreases as the bit plane gets deeper.Hence a relatively lower storage density of 0.05 × 10^(12) Tbits/cm3 is realized.
基金Supported by National Key Basic Research Special Foundation of China under Grant No.G1999075207the National Natural Science Foundation of China under Grant Nos.19525412 and 19984001.
文摘When a powerful femtosecond laser pulse was tightly focused into a bulk quartz,plasma generation occurred only in a very small focal volume.This extremely confined interaction led to an explosive expansion and generated a sub-micrometre void with a diameter as small as 200-300nm.The dependence of the size of the void on the laser energy or pulse duration was investigated and the mechanism of this process was associated dominantly with the multiphoton ionization.
