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Optical phase conjugation in Hg1 - xCdxTe.

M A Khan1, P W Kruse, J F Ready

  • 1Honeywell Corporate Material Sciences Center, Honeywell Corporate Technology Center, Bloomington, Minnesota 55420, USA.

Optics Letters
|August 21, 2009
PubMed
Summary

Researchers observed phase-conjugate signals in n-type HgCdTe at various temperatures using degenerate four-wave mixing. The third-order nonlinear susceptibility aligns with theories of conduction-band nonparabolicity.

Area of Science:

  • Nonlinear Optics
  • Solid-State Physics
  • Semiconductor Materials

Background:

  • Phase-conjugate optics is crucial for applications like optical signal processing and aberration correction.
  • Understanding nonlinear optical properties of semiconductors is key to developing advanced optoelectronic devices.
  • Mercury Cadmium Telluride (HgCdTe) is a tunable semiconductor alloy with significant optoelectronic applications.

Purpose of the Study:

  • To investigate phase-conjugate signals in n-type Hg1-xCdxTe.
  • To measure the nonlinear optical properties, specifically the third-order nonlinear susceptibility (X(3)).
  • To compare experimental results with theoretical predictions for X(3) in semiconductors.

Main Methods:

  • Degenerate four-wave mixing (DFWM) technique was employed.

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  • Experiments were conducted at various temperatures (12 K, 77 K, and 295 K).
  • Measurements were performed on n-type Hg1-xCdxTe samples with specific compositions (x = 0.216-0.232) at a wavelength of 10.6 micrometers.

    • Main Results:

    • Phase-conjugate signals were successfully observed across the tested temperature range.
    • The external power-reflection coefficient increased with pump-power densities, reaching saturation at 9%.
    • The derived third-order nonlinear susceptibility (X(3)) values were consistent with theoretical models.

    Conclusions:

    • The study confirms the presence of significant nonlinear optical effects in n-type HgCdTe.
    • Experimental data supports the theory attributing the third-order nonlinear susceptibility to conduction-band nonparabolicity.
    • These findings contribute to the understanding of nonlinear optical properties in narrow-gap semiconductors.