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Related Concept Videos

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Backward second-harmonic generation in periodically poled bulk LiNbO(3).

J U Kang, Y J Ding, W K Burns

    Optics Letters
    |June 15, 1997
    PubMed
    Summary

    Researchers achieved backward second-harmonic generation in lithium niobate (LiNbO3) crystals. This nonlinear optical process utilized a 3.3-micrometer domain period, demonstrating higher-order phase matching for efficient light conversion.

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    Area of Science:

    • Nonlinear optics
    • Materials science
    • Photonics

    Background:

    • Second-harmonic generation (SHG) is a key nonlinear optical process for frequency conversion.
    • Periodically poled lithium niobate (PPLN) is a widely used material for quasi-phase-matched (QPM) nonlinear optical devices.
    • Backward SHG offers potential advantages in certain device configurations.

    Purpose of the Study:

    • To experimentally demonstrate backward second-harmonic generation (BSHG) in periodically poled lithium niobate (PPLN).
    • To investigate higher-order phase matching (HOM) conditions for BSHG.
    • To determine the conversion efficiency achievable for BSHG in PPLN.

    Main Methods:

    • Fabrication of PPLN with a specific domain period (3.3 micrometers).
    • Experimental setup for generating and detecting backward second-harmonic waves.
    • Characterization of phase matching conditions and conversion efficiency at different fundamental wavelengths.

    Main Results:

    • Experimental observation of BSHG in PPLN with a 3.3-micrometer domain period.
    • Identification of higher-order phase matching (HOM) near 1490 nm (19th order), 1600 nm (18th order), and 1700 nm (17th order).
    • Achieved a maximum conversion efficiency of 0.02% for the BSHG process.

    Conclusions:

    • Backward second-harmonic generation is feasible in PPLN using higher-order phase matching.
    • The demonstrated HOM provides flexibility in wavelength selection for BSHG devices.
    • Further optimization could enhance the conversion efficiency for practical applications.