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Conferences > CLEO > 1995 > CThI > CThI20
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper CThI20

Optical differentiator based on rapid collapse of Wannier-Stark localization due to space-charge-field screening

M. Hosoda, K. Tominaga, T. Watanabe, and K. Fujiwara

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Abstract

Optical-differentiator operation was observed by using only a short-period super-lattice (SPSL) having the Wannier-Stark localization (WSL) effect 1,2 The p-i-n-diode sample had 100 periods of a nominally undoped GaAs/AlAs (42.5 and 8.5-Å-thick) super-lattice layer cladded by 50-nm Al0.4Ga0.6As undoped layers, and the GaAs substrate underneath the optical window was etched off to fabricate a transmission device. The incident light from a cw Ti:sapphire laser was modulated by an acousto-optical modulator (AOM) whose duty ratio was reduced to 10−2 −10−4 to avoid thermal effects. The incident-beam diameter monitored with a microscope setup was about 4 μm.

© 1995 Optical Society of America

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