Enhancement of Intra-tissue Refractive Index Shaping (IRIS) of the cornea by Two-Photon Absorption

2009 ◽  
Author(s):  
Li Ding ◽  
Lana J. Nagy ◽  
Lisen Xu ◽  
Jack Chun-Hung Chang ◽  
Jennifer Swanton ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

scholarly journals The Influence of Quantum Confinement on Third-Order Nonlinearities in Porous Silicon Thin Films

2018 ◽  
Vol 8 (10) ◽  
pp. 1810 ◽  
Author(s):  
Rihan Wu ◽  
Jack Collins ◽  
Leigh Canham ◽  
Andrey Kaplan
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Quantum Confinement ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Silicon Thin Films ◽  
Gaussian Decomposition

We present an experimental investigation into the third-order nonlinearity of conventional crystalline (c-Si) and porous (p-Si) silicon with Z-scan technique at 800-nm and 2.4- μ m wavelengths. The Gaussian decomposition method is applied to extract the nonlinear refractive index, n 2 , and the two-photon absorption (TPA) coefficient, β , from the experimental results. The nonlinear refractive index obtained for c-Si is 7 ± 2 × 10 − 6 cm 2 /GW and for p-Si is − 9 ± 3 × 10 − 5 cm 2 /GW. The TPA coefficient was found to be 2.9 ± 0.9 cm/GW and 1.0 ± 0.3 cm/GW for c-Si and p-Si, respectively. We show an enhancement of the nonlinear refraction and a suppression of TPA in p-Si in comparison to c-Si, and the enhancement gets stronger as the wavelength increases.

Fast and sensitive nonlinear processes: bistability in CdHgTe

1984 ◽  
Vol 313 (1525) ◽  
pp. 277-284 ◽  
Keyword(s):  
Refractive Index ◽  
Optical Bistability ◽  
Continuous Wave ◽  
Photon Absorption ◽  
Cadmium Mercury Telluride ◽  
Large Intensity ◽  
Mercury Telluride ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Fabry Perot

We discuss the origin and characteristics of the very large intensity-dependent changes in the refractive index of the semiconductor cadmium mercury telluride at 10.6 m. With continuous wave (c.w.) radiation and sample temperatures of 77 K nonlinear Fabry-Perot effects can be observed at powers as low as 1 mW. The Auger dominated recombination process and the thermal contributions to the refractive index make observations of optical bistability difficult with c.w. radiation. However, the use of a pulsed CO 2 laser and two-photon absorption of the radiation does lead to the observation of bistability at room temperature. We compare these results with the reported work on InSb.

Dispersion of nonlinear refractive index in layered WS_2 and WSe_2 semiconductor films induced by two-photon absorption

2016 ◽  
Vol 41 (17) ◽  
pp. 3936 ◽  
Author(s):  
Ningning Dong ◽  
Yuanxin Li ◽  
Saifeng Zhang ◽  
Niall McEvoy ◽  
Xiaoyan Zhang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Photon Absorption ◽  
Semiconductor Films ◽  
Two Photon Absorption ◽  
Two Photon
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