The influence of single-photon absorption on the performance of the two-photon waveguide autocorrelator

Karwlanehchi, M. M., Barrow, D. A., Bryce, A. C., Hamilton, C. J. and Marsh, J. H. (1997) The influence of single-photon absorption on the performance of the two-photon waveguide autocorrelator. IEEE Journal of Quantum Electronics, 33(6), pp. 933-937. (doi:10.1109/3.585479)

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Abstract

The propagation loss and the single-photon absorption coefficients in a two-photon waveguide autocorrelator are measured as a function of wavelength. The propagation loss was as low as 1.37 cm/sup -1/ at a wavelength of 940 nm in a device with an Al/sub 0.2/Ga/sub 0.8/As waveguide core. Using a photocurrent technique, band-to-band absorption was measured for photon energies well below that of the bandgap. It was demonstrated that, although the band-to-band absorption coefficient is small (/spl sim/10/sup -2/ cm/sup -1/ at a wavelength of 1 /spl mu/m), it is responsible for reducing the contrast ratio of the waveguide autocorrelator. It is suggested that the single-photon absorption takes place via deep levels with relatively long carrier lifetimes.

Item Type:Articles
Additional Information:This work was supported by the U.K. Ministry of Defense and the Engineering and Physical Sciences Research Council.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Marsh, Professor John
Authors: Karwlanehchi, M. M., Barrow, D. A., Bryce, A. C., Hamilton, C. J., and Marsh, J. H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Journal of Quantum Electronics
Publisher:IEEE
ISSN:0018-9197
ISSN (Online):1558-1713

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