Document Type
Article
Publication Date
9-14-2018
Abstract
Cadmium silicon diphosphide (CdSiP2) is a nonlinear material often used in optical parametric oscillators (OPOs) to produce tunable laser output in the mid-infrared. Absorption bands associated with donors and acceptors may overlap the pump wavelength and adversely affect the performance of these OPOs. In the present investigation, electron paramagnetic resonance (EPR) is used to identify two unintentionally present acceptors in large CdSiP2 crystals. These are an intrinsic silicon-on-phosphorus antisite and a copper impurity substituting for cadmium. When exposed to 633 µm laser light at temperatures near or below 80 K, they convert to their neutral paramagnetic charge states (Si0P and Cu0Cd) and can be monitored with EPR. The corresponding donor serving as the electron trap is the silicon-on-cadmium antisite (Si2+Cd before illumination and Si+Cd after illumination). Removing the 633 µm light and warming the crystal above 90 K quickly destroys the EPR signals from both acceptors and the associated donor. Broad optical absorption bands peaking near 0.8 and 1.4 μm are also produced at low temperature by the 633 µm light. These absorption bands are associated with the Si0P and Cu0Cd acceptors.
Source Publication
AIP Advances
Recommended Citation
E. M. Scherrer, L. E. Halliburton, E. M. Golden, K. T. Zawilski, P. G. Schunemann, F. K. Hopkins, K. L. Averett, N. C. Giles; Electron paramagnetic resonance and optical absorption study of acceptors in CdSiP2 crystals. AIP Advances 1 September 2018; 8 (9): 095014. https://doi.org/10.1063/1.5041806
Comments
© 2018 Author(s).
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. CC BY 4.0.
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Funding note: This work was supported by the Air Force Office of Scientific Research (under award numbers F4FGA08054J001 and FA955016RDCOR353) and the Air Force Research Laboratory. The authors thank C. M. Liebig at the Air Force Research Laboratory for program management.
AIP Advances is a gold open access journal published by the American Institute of Physics.
[*] Author note: Elizabeth Scherrer was an AFIT PhD candidate at the time of publication.