摘要
The spectral phase of the femtosecond laser field is an important parameter that affects the up-conversion(UC)luminescence efficiency of dopant lanthanide ions.In this work,we report an experi-mental study on controlling the UC lmiiinescence efficiency in Sm^3+:NaYF4 glass by 800-nm femtosec-ond laser pulse shaping using spectral phase modulation.The optimal phase control strategy efficiently enhances or suppresses the UC luminescence intensity.Based on the laser-power dependence of the UC luminescence intensity and its comparison with the luminescence spectrum under direct 266-nm fem-tosecond lciser irradiation,we propose herein an excitation model combining non-resonant two-photon absorption with resonance-media ted three-photon absorption to explain the experimental observations.
基金
the Na-tional Natural Science Foundation of China(Grant Nos.91850202,11774094,11727810,11804097,and 61720106009)
the Science and Technology Commission of Shanghai Municipality(Grant No.17ZR146900)
the China Postdoctoral Science Foundation(Grant No.2018M641958)
ECNU Academic Innovation Promotion Program for Excellent Doctoral Students(Grant No.YBNLTS2019-011).
