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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
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Related Experiment Video

Updated: Jul 7, 2026

Fabrication of Schottky Diodes on Zn-polar BeMgZnO/ZnO Heterostructure Grown by Plasma-assisted Molecular Beam Epitaxy
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Second-harmonic and sum-frequency generation in ZnGeP(2).

K Kato

    Applied Optics
    |April 20, 1997
    PubMed
    Summary

    Zinc Germanium Phosphide (ZnGeP2) crystals are phase matchable for type-1 second-harmonic generation of carbon dioxide (CO2) lasers up to 10.78 micrometers. Sellmeier equations and nonlinear optical constants for this material are detailed.

    Area of Science:

    • Nonlinear optics
    • Solid-state physics
    • Materials science

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion in laser systems.
    • Exploring novel materials for efficient SHG at longer wavelengths is an active research area.
    • Carbon dioxide (CO2) lasers operate in the mid-infrared, requiring suitable nonlinear optical materials.

    Purpose of the Study:

    • To investigate the phase-matching properties of Zinc Germanium Phosphide (ZnGeP2) for SHG.
    • To determine the Sellmeier equations for ZnGeP2.
    • To report the nonlinear optical constant of ZnGeP2.

    Main Methods:

    • Experimental investigation of phase matching for type-1 SHG.
    • Measurement of optical properties at specific wavelengths and temperatures.

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  • Derivation of Sellmeier equations from experimental data.

    • Main Results:

    • ZnGeP2 demonstrates phase matchability for type-1 SHG of a CO2 laser.
    • Phase matching was achieved up to a wavelength of 10.78 micrometers.
    • Sellmeier equations and the nonlinear optical constant (d36) were determined for ZnGeP2.

    Conclusions:

    • ZnGeP2 is a promising material for efficient frequency conversion of CO2 lasers.
    • The reported Sellmeier equations and nonlinear optical constant enable precise device design.
    • ZnGeP2 offers potential for applications requiring mid-infrared nonlinear optical processes.