Laser micro-structuring of amorphous polyether(ether)ketone (PEEK) has been demonstrated with 180 fs/1 kHz NIR (775 nm) and NUV (387 nm) laser pulses. Significant differences in laser-material interaction is observed between the NIR and NUV wavelengths with single pulse ablation threshold found to be 2.01 ± 0.05 J cm −2 and 0.23 ± 0.02 J cm −2 at 775 nm and 387 nm respectively. This is connected to the requirement for multi-photon absorption at 775 nm, where PEEK is transparent, while at 387 nm, significant linear absorption within the material bandgap occurs, favouring sequential 2-photon absorption via reverse saturated absorption (RSA). Open aperture Z scan data yields a 2-photon absorption coefficient β 387 (I) which is intensity dependent, consistent with RSA. Multi-pulse exposure yields incubation coefficients of S 775 = 0.72 ± 0.01 and S 387 = 0.85 ± 0.02. This significant reduction in NUV incubation is consistent w...

中文翻译：

---

飞秒激光在775 nm和387 nm非晶态聚醚（醚）酮的微结构

用180 fs / 1 kHz NIR（775 nm）和NUV（387 nm）激光脉冲证明了非晶态聚醚（醚）酮（PEEK）的激光微结构。在NIR和NUV波长之间观察到激光材料相互作用的显着差异，单脉冲消融阈值分别在775 nm和387 nm处分别为2.01±0.05 J cm -2和0.23±0.02 J cm -2。这与在775 nm处对多光子吸收的要求有关，PEEK是透明的，而在387 nm处，材料带隙内发生了显着的线性吸收，有利于通过反向饱和吸收（RSA）进行连续2光子吸收。开孔Z扫描数据产生2-光子吸收系数β387（I），其与强度有关，与RSA一致。多脉冲暴露产生的孵化系数为S 775 = 0.72±0。01和S 387 = 0.85±0.02。NUV孵化的显着减少是一致的。