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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