One-, two-, and three-photon processes in CdI2 crystal

✍ Scribed by M.Idrish Miah

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 255 KB
• Volume: 25
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2003.08.007

✦ Synopsis

Single crystal of cadmium iodide (CdI 2 ) was studied under laser excitation from the point of view of optical nonlinear materials having potential applications in electronic devices. Low temperature photoluminescence (PL) spectra of the CdI 2 crystal were measured. To identify different photon absorption processes in the crystal, the dependences of the PL peak intensity (I PL ) on excitation power (I 0 ) were investigated. The dependences were found to follow approximately the power law I PL % I m 0 , where m ¼ 1, 2 and 3 for N 2 , ruby and neodymium laser excitations respectively, indicating that the optical responses are due to a first-order, second-order and third-order processes respectively. Photoconductivity measurements in the crystal showed a quadratic dependence of the charge induced on incident laser power, giving evidence of two-photon induced conductivity. The majority carrier lifetime was also studied.