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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 13 — Jun. 18, 2012
  • pp: 13798–13809

High efficiency optical modulation at a telecom wavelength using the quantum Zeno effect in a ladder transition in Rb atoms

Subramanian Krishnamurthy, Y. Wang, Y. Tu, S. Tseng, and M. S. Shahriar  »View Author Affiliations

Optics Express, Vol. 20, Issue 13, pp. 13798-13809 (2012)

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We demonstrate a high-efficiency optical modulator at ~1323 nm using the quantum Zeno effect in a ladder transition in a Rb vapor cell. The lower leg of the transitions represents the control beam while the upper leg of the transitions represents the signal beam. The cross-modulation of the signal beam transmission is observed as the control beam is intensity modulated, and is explained in terms of the quantum Zeno effect. We observe a modulation depth of near 100% at frequencies up to 1MHz and demonstrate modulation at speeds up to 75 MHz, with a 3 dB bandwidth of about 5 MHz, limited by the homogeneous linewidth of the intermediate state. We also describe how much higher modulation speeds could be realized by using a buffer gas to broaden the transitions. We identify and explain the special conditions needed for optimizing the modulation efficiency. Numerical simulations of modulation at ~1GHz are presented. The maximum modulation speed is found to scale with the pressure-broadened linewidth of the intermediate state, so that much higher speeds should be attainable.

© 2012 OSA

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(250.4110) Optoelectronics : Modulators

ToC Category:
Atomic and Molecular Physics

Original Manuscript: April 13, 2012
Revised Manuscript: May 8, 2012
Manuscript Accepted: May 8, 2012
Published: June 5, 2012

Subramanian Krishnamurthy, Y. Wang, Y. Tu, S. Tseng, and M. S. Shahriar, "High efficiency optical modulation at a telecom wavelength using the quantum Zeno effect in a ladder transition in Rb atoms," Opt. Express 20, 13798-13809 (2012)

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