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Time-resolved self-defocusing in Cd(0.23)Hg(0.77)Te and InSb.
Optics Letters
|September 10, 2009
Summary
This study shows significant refractive-index changes in Cadmium Mercury Telluride (CdHgTe) and Indium Antimonide (InSb) due to optical nonlinearity. These changes, up to Deltan ~ 0.1, were observed using a carbon dioxide (CO2) laser.
Area of Science:
- Nonlinear Optics
- Semiconductor Physics
- Materials Science
Background:
- Optical nonlinearity influences light propagation in semiconductors.
- Understanding refractive-index changes is crucial for optoelectronic device design.
- CdHgTe and InSb are key materials in infrared applications.
Purpose of the Study:
- To experimentally investigate self-defocusing in CdHgTe and InSb.
- To quantify refractive-index changes induced by optical nonlinearity.
- To differentiate electronic and thermal contributions to optical nonlinearity.
Main Methods:
- Utilized a hybrid carbon dioxide (CO2) laser emitting at 10.6 micrometers.
- Performed time-resolved measurements of transmitted temporal pulse profiles.
- Analyzed self-defocusing effects at room temperature.
Main Results:
- Observed significant refractive-index changes (Deltan ~ 0.1) attributed to electronic optical nonlinearity.
- Measured thermally induced contributions with dn/dT ~ -1 x 10(-3) K(-1) in CdHgTe.
- Demonstrated the impact of nonlinear optical effects on pulse propagation.
Conclusions:
- Electronic optical nonlinearity is a dominant factor in self-defocusing for these materials.
- Thermal effects also contribute to refractive-index modulation in CdHgTe.
- The findings provide insights into nonlinear optical properties of CdHgTe and InSb.
