Laser ablation and structuring of CdZnTe with femtosecond laser pulses
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第13期
论文作者：J.J.J.Nivas E.Allahyari Q.Hao S.Amoruso X.Wang
文章页码：180 - 185
摘 要：We report an experimental investigation on laser ablation and associated surface structuring of CdZnTe by femtosecond Ti:Sa laser pulses（laser wavelength λ≈800 nm,≈35 fs,10 Hz）,in air.By exploiting different static irradiation conditions,the fluence threshold and the incubation effect in CdZnTe are estimated.Interestingly,surface treatment with a low laser fluence（laser pulse energy E≈5-10μJ） and number of shots（5<N <50） show the formation of well-defined cracks in the central part of the shallow crater,which is likely associated to a different thermal expansion coefficients of Te inclusions and matrix during the sample heating and cooling processes ensuing femtosecond laser irradiation.Irradiation with a larger number of pulses（N≈500,1000） with higher pulse energies（E≈30-50 μJ） results in the formation of welldefined laser-induced periodic surface structures（LIPSS） in the outskirts of the main crater,where the local fluence is well below the material ablation threshold.Both low spatial frequency and high spatial frequency LIPSS perpendicular to the laser polarization are found together and separately depending on the irradiation condition.These are ascribed to a process of progressive aggregation of randomly distributed nanoparticles produced during laser ablation of the deep crater in the region of the target irradiated by a fluence below the ablation threshold with many laser pulses.
J.J.J.Nivas1,2，E.Allahyari1,2，Q.Hao4，S.Amoruso1,2，X.Wang2,5
1. Dipartimento di Fisica “Ettore Pancini”, Università di Napoli “Federico Ⅱ”4. North China Research Institute of Electro-Optics5. School of Remote Sensing and Information Engineering, Wuhan University
摘 要：We report an experimental investigation on laser ablation and associated surface structuring of CdZnTe by femtosecond Ti:Sa laser pulses（laser wavelength λ≈800 nm,≈35 fs,10 Hz）,in air.By exploiting different static irradiation conditions,the fluence threshold and the incubation effect in CdZnTe are estimated.Interestingly,surface treatment with a low laser fluence（laser pulse energy E≈5-10μJ） and number of shots（5<N <50） show the formation of well-defined cracks in the central part of the shallow crater,which is likely associated to a different thermal expansion coefficients of Te inclusions and matrix during the sample heating and cooling processes ensuing femtosecond laser irradiation.Irradiation with a larger number of pulses（N≈500,1000） with higher pulse energies（E≈30-50 μJ） results in the formation of welldefined laser-induced periodic surface structures（LIPSS） in the outskirts of the main crater,where the local fluence is well below the material ablation threshold.Both low spatial frequency and high spatial frequency LIPSS perpendicular to the laser polarization are found together and separately depending on the irradiation condition.These are ascribed to a process of progressive aggregation of randomly distributed nanoparticles produced during laser ablation of the deep crater in the region of the target irradiated by a fluence below the ablation threshold with many laser pulses.
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