(Cd,Mg)Te crystals for picosecond-response optical-to-x-ray radiation detectors

Journal Article · Fri Nov 11 00:00:00 EST 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0101831· OSTI ID:1970638

Cheng, J. ; Chen, G. ; Chakraborty, D. ; Kutcher, S.; Wen, J.; Chen, H.; Trivedi, S.; Sobolewski, Roman

We demonstrate a photodetector sensitive to both optical and x-ray picosecond pulses based on our in-house grown cadmium magnesium telluride (Cd,Mg)Te single crystal. Specifically, we developed In-doped Cd0.96Mg0.04Te material and discuss its femtosecond optical photoresponse, as well as the detector performance, such as <100-pA dark current and up to 0.22-mA/W responsivity for 780-nm wavelength optical radiation. The detector exposed to Ti fluorescence (K alpha) x-ray pulses at 4.5 keV, generated by a free-electron laser beam with the central energy of 9.8 keV and <100 fs pulse width, exhibited readout-electronics-limited 200-ps full-width-at-half-maximum photoresponse, demonstrating that it is suitable for coarse timing in free-electron laser x-ray/optical femtosecond pump–probe spectroscopy applications.

• Sponsoring Organization: USDOE
• Grant/Contract Number: SC0021468
• OSTI ID: 1970638
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Vol. 93 Journal Issue: 11; ISSN 0034-6748
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English