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介绍了飞秒激光双光子吸收和光聚合的机制,将飞秒激光技术应用于生物相容性材料(ORMOCER)的三维微纳米加工中。在ORMOCER材料内实现了双光子光聚合,最高加工精度达到0.5μm,突破了衍射极限。推导出双光子光聚合阈值的数学表达式,研究了扫描速度V和激光功率P对横向尺寸的影响规律。在此基础上采用飞秒激光双光子微细加工技术制备了典型的微生物器件——微井阵列、微柱阵列和光子晶体生物微型支架。
The mechanism of two-photon absorption and photopolymerization of femtosecond laser is introduced. The femtosecond laser technology is applied to the three-dimensional micro-nano fabrication of biocompatible materials (ORMOCER). Two-photon photopolymerization is achieved in the ORMOCER material with a maximum processing accuracy of 0.5 μm, which breaks through the diffraction limit. The mathematical expression of two-photon photopolymerization threshold was deduced. The influence of scanning velocity V and laser power P on the transverse dimension was studied. On this basis, the typical micro-device micro-well array, micro-column array and photonic crystal micro-stent were prepared by femtosecond laser two-photon micromachining technology.