Eberly College of Arts and Sciences
Physics and Astronomy
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 wave- length 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 anti- site and a copper impurity substituting for cadmium. When exposed to 633 nm 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+ before illumina-
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 pro- duced at low temperature by the 633 nm light. These absorption bands are associated with the Si0P and Cu0Cd acceptors. © 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5041806
Digital Commons Citation
Scherrer, E M.; Halliburton, L E.; Golden, E M.; Zawilski, K T.; Schunemann, P G.; Hopkins, F K.; Averett, K L.; and Giles, N C., "Electron paramagnetic resonance and optical absorption study of acceptors in CdSiP2 crystals" (2018). Faculty & Staff Scholarship. 1454.
Cite as: AIP Advances 8, 095014 (2018); https://doi.org/10.1063/1.5041806