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Anisotropic Saturable and Excited‐State Absorption in Bulk ReS 2
Author(s) -
Meng Xianghai,
Zhou Yongjian,
Chen Ke,
Roberts Richard H.,
Wu Wenzhi,
Lin JungFu,
Chen Ray T.,
Xu Xiaochuan,
Wang Yaguo
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800137
Subject(s) - saturable absorption , materials science , anisotropy , laser , polarization (electrochemistry) , excited state , absorption (acoustics) , optics , optoelectronics , molecular physics , atomic physics , fiber laser , wavelength , physics , chemistry , composite material
The intensity‐scan (I‐scan) technique to study the polarization‐dependent, nonlinear processes in exfoliated bulk ReS 2 is utilized. The polarization‐dependent reflection and transmission of ReS 2 , from which the absorption coefficients are extracted using the transfer matrix method, are measured. Absorption coefficients under high laser peak power show a transition from saturable absorption (SA) to reverse saturable absorption when rotating the laser polarization with respect to the b ‐axis. It is found that SA and excited‐state absorption (ESA) contribute to the nonlinear optical processes. Both the SA and ESA show strong dependence on the polarization angle, which is attributed to the anisotropic optical transition probability and electronic band structure in ReS 2 . The anisotropic nonlinear optical properties of ReS 2 may find applications as saturable absorbers in lasers and optical modulators.