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Structural , optical and femtosecond third-order nonlinear optical properties of LiNbO 3 thin fi lms
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tumuluria, Anil Bharatia, M. S. S. Raoa, S. Venugopal Rajua, K. C. James |
| Copyright Year | 2017 |
| Abstract | LiNbO3 thin films were deposited by means of Al:ZnO as intermediate layer using pulsed laser deposition and their structural, linear and nonlinear optical (NLO) properties were investigated. The films were found to be polycrystalline, (110) orientation for Al:ZnO/fused silica and (300) orientation for Al:ZnO/ quartz substrates. The films demonstrated a transparency of >80% in the visible and near-infrared region. The NLO studies were performed with the Z-scan technique using 150 fs, 80 MHz pulses at 800 nm. The studies revealed that the polycrystalline LiNbO3films and (300) LiNbO3films demonstrated reverse saturable absorption while a transition to saturable absorption was observed in the case of (110) LiNbO3. The presence of two-photon absorption is attributed to the indirect transition via intermediate defect levels which is related to the structural asymmetry. The large nonlinearity in refractive index could be a result of the strain induced ferroelectric polarization. The magnitude of the third order optical nonlinearity of all films was 10 11 e.s.u. which is orders of magnitude higher than the value obtained for single crystal Z-cut LiNbO3. © 2017 Elsevier Ltd. All rights reserved. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://acrhem.org/download/163.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
