Switching circuit to improve the frequency modulation difference-intensity THz quantum cascade laser imaging

Journal Article · Fri Apr 24 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4915165· OSTI ID:22391517

Saat, N. K. ^[1]; Dean, P.; Khanna, S. P.; Salih, M.; Linfield, E. H.; Davies, A. G. ^[2]

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1. Department of Physics, Faculty of Science, University Putra Malaysia (Malaysia)
2. 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, Vol. 1657, Issue 1; Conference: PERFIK 2014: National Physics Conference 2014, Kuala Lumpur (Malaysia), 18-19 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
DESIGN
ELECTRIC POTENTIAL
FREQUENCY MODULATION
OPTICS
Q-SWITCHING
SOLID STATE LASERS
SWITCHING CIRCUITS