Switching circuit to improve the frequency modulation difference-intensity THz quantum cascade laser imaging
Journal Article
·
· AIP Conference Proceedings
- Department of Physics, Faculty of Science, University Putra Malaysia (Malaysia)
- School of Electronic and Electrical Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT (United Kingdom)
We demonstrate new switching circuit for difference-intensity THz quantum cascade laser (QCL) imaging by amplitude modulation and lock in detection. The switching circuit is designed to improve the frequency modulation so that it can stably lock the amplitude modulation of the QCL and the detector output. The combination of a voltage divider and a buffer in switching circuit to quickly switch the amplitude of the QCL biases of 15.8 V and 17.2 V is successfully to increase the frequency modulation up to ∼100 Hz.
- OSTI ID:
- 22391517
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1657; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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