Chinese Optics Letters, Volume. 23, Issue 1, 011901(2025)
Dispersions of two-photon and three-photon absorption in GaS films from 540 to 1600 nm
Figures & Tables(6)
Fig. 1. (a) SEM image, (b) Raman spectrum with an excitation wavelength of 532 nm, (c) XRD pattern, and (d) linear absorption spectrum and Tauc plot of the synthesized GaS film.
Fig. 2. (a) Open aperture Z-scan traces of the GaS film with excitation wavelengths of 540, 580, 620, 660, 800, 940, and 1040 nm at a pump intensity of about 200 GW/cm2. (b) The plots of ln (1−T) versus ln (I) to validate the order of nonlinearity, with solid lines representing the theoretical fitting.
Fig. 3. (a) Two-level system used to model the 2PA process. (b) Dispersion of 2PA coefficients as a function of Ephoton/Eg for GaS films, with solid lines representing theoretical fitting. (c) Normalized transmittance as a function of laser intensity under excitation wavelengths ranging from 540 to 1040 nm. (d) The fitted σ2PA parameters based on the two-level system.
Fig. 4. (a) Open aperture Z-scan traces of the GaS film under the excitation wavelengths from 1200 to 1600 nm at the pump intensity of about 60 GW/cm2. (b) The ln (1−T) as a function of ln(I). The solid lines represent the theoretical fitting.
Fig. 5. (a) Two-level system used for fitting the 3PA process. (b) Dispersion of 3PA coefficients as a function of Ephoton/Eg for GaS films, with solid lines representing theoretical fitting. (c) Normalized transmittance as a function of laser intensity under excitation wavelengths ranging from 1200 to 1600 nm. (d) The fitted σ3PA parameters based on the two-level system.
Table 1. The Summary of 2PA and 3PA Coefficients as Reported in the Literature
View tableView in ArticleTable 1. The Summary of 2PA and 3PA Coefficients as Reported in the Literature
Material Laser source β2 (cm/GW) β3 (cm3/GW2) Ref. β-Ga2O3 350 nm, 190 fs 1.8 — [ 19 ]570 nm, 190 fs — 3.7 × 10−4 [ 4 ]750 nm, 190 fs — 0.8 × 10−4 β-GaS 650 nm, 190 fs 4900 — [ 12 ]GaN 500 nm, 190 fs 6.2 — [ 7 ]532 nm, 18 fs 8.5 — 860 nm, 190 fs — 1.8 × 10−3 1000 nm, 190 fs — 3.5 × 10−3 ZnO 650 nm, 150 fs ∼1 — [ 5 ]860 nm, 150 fs — ∼2 × 10−3 ZnS 780 nm, 120 fs — 0.024 [ 6 ]MoS2 1300 nm, 150 fs — 2.2 [ 24 ](C4H9NH3)2PbBr4 1030 nm, 110 fs — ∼2 [ 25 ]GaS 620 nm, 60 fs 19.89 — this work 1500 nm, 52 fs — 4.88
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Yijie Wang, Jinhong Liu, Yanqing Ge, Erkang Li, Lili Zhao, Chunhui Lu, Yixuan Zhou, Xinlong Xu, "Dispersions of two-photon and three-photon absorption in GaS films from 540 to 1600 nm," Chin. Opt. Lett. 23, 011901 (2025)
Paper Information
Category: Nonlinear Optics
Received: Jun. 22, 2024
Accepted: Jul. 26, 2024
Published Online: Feb. 10, 2025
The Author Email: Chunhui Lu (luchunhui@nwu.edu.cn), Yixuan Zhou (yxzhou@nwu.edu.cn), Xinlong Xu (xlxuphy@nwu.edu.cn)
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