Étalon enhancement of nonlinear optical response in Bi1−xSbx
- 12 August 1991
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 59 (7) , 756-758
- https://doi.org/10.1063/1.105333
Abstract
Measurements of the nondegenerate four‐wave mixing of CO2 laser beams in a Bi1−xSbx film have yielded the largest high‐power third‐order nonlinear susceptibilities ever reported at that wavelength (χ(3)≳6×10−4 esu at P0≳2×105 W/cm2). Furthermore, an étalon effect resulting from the high reflectivity of the Bi1−xSbx films at both the air and substrate interfaces leads to an additional enhancement of the four‐wave signal by as much as a factor of 30. A theoretical model based on optical modulation of the free‐carrier susceptibility gives results which are in excellent agreement with the data.Keywords
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