Yang Zhang, Quanzhong Zhao, Huaihai Pan, Chengwei Wang, Jing Qian, Zhanshan Wang. Simultaneous upconversion luminescence and color centers generated by femtosecond laser irradiation of LiF crystals[J]. Chinese Optics Letters, 2016, 14(8): 083201
- Chinese Optics Letters
- Vol. 14, Issue 8, 083201 (2016)
Fig. 1. Emission spectra of the LiF crystal sample under focused femtosecond laser irradiation and 448 nm monochromatic light excitation (using a 600 nm IR cut filter). Inset: The sample irradiated by a focused femtosecond laser in a darkroom.
Fig. 2. Absorption spectra of the LiF crystal before (black curve) and after (red curve) femtosecond laser irradiation. Inset: Spectral differences after and before femtosecond laser irradiation.
Fig. 3. Excitation and emission spectra for the femtosecond laser induced CCs in LiF crystals at room tempertaure. (λ excitation = 448 nm λ emission = 540 nm
Fig. 4. (a) Illustration of upconversion luminescence of LiF by femtosecond laser irradiation. (b) Energy level diagram for F 3 + ⋯
Fig. 5. (a) Luminescence intensity of the LiF crystals as a function of femtosecond pump power. (b) Dependence of the upconversion luminescence efficiency on excitation power.
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