Electrically tunable group delays using quantum wells in a distributed Bragg reflector

Thomas R. Nelson Jr.; John P. Loehr; Qianghua Xie; James E. Ehret; Joseph E. Van Nostrand; Lisa Gamble; Darryl K. Jones; Spencer T. Cole; Rebecca H. Trimm; William M. Diffey; Richard Lynn Fork; Andrew S. Keys

doi:10.1117/12.354675

26 July 1999 Electrically tunable group delays using quantum wells in a distributed Bragg reflector

Thomas R. Nelson Jr., John P. Loehr, Qianghua Xie, James E. Ehret, Joseph E. Van Nostrand, Lisa Gamble, Darryl K. Jones, Spencer T. Cole, Rebecca H. Trimm, William M. Diffey, Richard Lynn Fork, Andrew S. Keys

Author Affiliations +

Proceedings Volume 3714, Enabling Photonic Technologies for Aerospace Applications; (1999) https://doi.org/10.1117/12.354675
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

We present an optical delay line structure incorporating In_xGa_1-xAs quantum wells in the GaAs quarter- wave layers of a GaAs/AlAs distributed Bragg reflector. Applying an electric field across the quantum wells shifts and broadens the e1-hh1 exciton peak via the quantum- confined Stark effect. Resultant changes in the index of refraction thereby provide a means for altering the group delay of an incident laser pulse. Theoretical results predict tunable delays on the order of 50 fs for a 30-period structure incorporating 3 quantum wells per GaAs layer. Structure design, growth and fabrication are detailed. Preliminary group delay measurements on large-area samples with no applied bias are presented.

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Thomas R. Nelson Jr., John P. Loehr, Qianghua Xie, James E. Ehret, Joseph E. Van Nostrand, Lisa Gamble, Darryl K. Jones, Spencer T. Cole, Rebecca H. Trimm, William M. Diffey, Richard Lynn Fork, and Andrew S. Keys "Electrically tunable group delays using quantum wells in a distributed Bragg reflector", Proc. SPIE 3714, Enabling Photonic Technologies for Aerospace Applications, (26 July 1999); https://doi.org/10.1117/12.354675

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