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Optical limiting using the two-photon absorption electrical modulation effect in HgCdTe photodiode.

Haoyang Cui1, Junjie Yang, Jundong Zeng

  • 1School of Electronic and Information Engineering, Shanghai University of Electric Power, 2103 Pingliang Road, Shanghai 200090, China.

Thescientificworldjournal
|November 8, 2013
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Summary
This summary is machine-generated.

This study demonstrates electrical control over two-photon absorption (TPA) laser output intensity. By adjusting the electric field, TPA can be continuously modulated, allowing for precise control of output saturation intensity in pn junction devices.

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Area of Science:

  • Nonlinear Optics
  • Semiconductor Physics

Background:

  • Two-photon absorption (TPA) is a nonlinear optical process crucial for applications like optical switching and limiting.
  • Understanding the electrical modulation of TPA is essential for developing advanced optoelectronic devices.

Purpose of the Study:

  • To investigate the electrical modulation properties of output intensity in TPA pumping.
  • To analyze the dependence of TPA on frequency dispersion and electric field strength.
  • To explore the control of output saturation intensity via electric field manipulation.

Main Methods:

  • Calculated TPA frequency dispersion using the Wherrett theory model.
  • Calculated TPA electric field dependence using the Garcia theory model.
  • Determined laser pulse propagation and output intensity using the function-transfer method in a pn junction device.

Main Results:

  • Both Wherrett and Garcia models predicted significant TPA coefficient variation due to increased transition rates.
  • Output intensity exhibited nonlinear behavior with incident light intensity, reaching saturation.
  • Output saturation intensity was inversely dependent on electric field strength, enabling electrical clamping.

Conclusions:

  • Electrical modulation offers a continuous and wide-range method to adjust TPA and output intensity.
  • The electric field strength provides an effective means to control the steady output intensity of TPA.
  • This research facilitates the development of electrically controlled TPA-based optoelectronic devices.