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Proceedings Paper

Compact continuous wave THz source based on monolithic two-color laser diode
Author(s): Jared Ombiro Gwaro; Carsten Brenner; Bernd Sumpf; Andreas Klehr; Jörg Fricke; Martin R. Hofmann
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Paper Abstract

We report a stable and compact CW THz source, based on fiber coupled photoconducting antennas pumped with monolithically integrated dual mode distributed Bragg reflector semiconductor laser diode (DBR LD). Two DBR lasers are monolithically integrated on single substrate with a Y-shaped waveguide structure and made to emit two wavelengths simultaneously at 785nm center wavelength, with stable spectral wavelength difference of 0.6 nm. Ion implanted GaAs log spiral antennas are used to generate and detect THz radiation in homodyne set up. The detected THz frequency corresponds well to the value obtained for the optical beat frequency of the two modes. We analyze the use of this system for simple THz non-destructive testing applications like moisture measurement on leaves and different papers. The results obtained demonstrate the feasibility of a compact, simple, and cost-efficient CW THz system which could gain application in industrial non-destructive testing measurements.

Paper Details

Date Published: 14 May 2018
PDF: 7 pages
Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 106841Y (14 May 2018); doi: 10.1117/12.2306866
Show Author Affiliations
Jared Ombiro Gwaro, Ruhr-Univ. Bochum (Germany)
Carsten Brenner, Ruhr-Univ. Bochum (Germany)
Bernd Sumpf, Ferdinand-Braun-Institut (Germany)
Andreas Klehr, Ferdinand-Braun-Institut (Germany)
Jörg Fricke, Ferdinand-Braun-Institut (Germany)
Martin R. Hofmann, Ruhr-Univ. Bochum (Germany)

Published in SPIE Proceedings Vol. 10684:
Nonlinear Optics and its Applications 2018
Benjamin J. Eggleton; Neil G. R. Broderick; Anna C. Peacock, Editor(s)

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