High-sensitivity two-photon absorption microcavity autocorrelator

T. Krug (1, 2) , M. Lynch (1, 2) , A.L. Bradley (1, 3) , J.F. Donegan (1, 3) , Hervé Folliot (4) , L.P. Barry , J.S. Roberts (5) , G. Hill (5)

1 SEMICONDUCTOR PHOTONICS GROUP - Semiconductor Photonics Group
2 SEMICOND. PHOTONICS GROUP, TRINITY COLL., DUBLIN, IRELAND - Semiconductor Photonics Group, Trinity College Dublin, Ireland
3 Semiconductor Photonics Research Group
4 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
5 EPSRC - National Centre for III-V Technologies

A GaAs-AlAs microcavity device has been used as a photodetector in an autocorrelator for measuring the temporal pulsewidth of 1.5-/spl mu/m optical pulses. Enhancement of the two-photon absorption photocurrent due to the microcavity structure results in an autocorrelation (average power times peak power) sensitivity of 9.3/spl times/10/sup -4/ (mW)/sup 2/, which represents two orders of magnitude improvement when compared with conventional autocorrelators.

Mots clés: III-V semiconductors aluminium compounds gallium arsenide high-speed optical techniques micro-optics microcavities optical communication equipment optical correlation photodetectors two-photon processes

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique / photonique

T. Krug, M. Lynch, A.L. Bradley, J.F. Donegan, Hervé Folliot, et al.. High-sensitivity two-photon absorption microcavity autocorrelator. IEEE Photonics Technology Letters, 2004, 16 (6), pp.1543 - 1545. ⟨10.1109/LPT.2004.827102⟩. ⟨hal-00142660⟩