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Related Concept Videos

Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Related Experiment Video

Updated: Jun 19, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Frequency upconversion by phase-matched sum-frequency generation in an optical parametric oscillator.

E C Cheung, K Koch, G T Moore

    Optics Letters
    |October 27, 2009
    PubMed
    Summary

    We generated 0.589-micrometer radiation using a silver gallium sulfide (AgGaS2) optical parametric oscillator and potassium titanyl phosphate (KTP) crystal. Intracavity sum-frequency generation achieved 10.5% efficiency, producing short, near-transform-limited pulses.

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

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    Last Updated: Jun 19, 2026

    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
    09:23

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    Published on: May 30, 2014

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Efficiently generating shorter wavelengths from existing OPO systems is an ongoing challenge.
    • Silver gallium sulfide (AgGaS2) and potassium titanyl phosphate (KTP) are established nonlinear optical crystals.

    Purpose of the Study:

    • To demonstrate the generation of 0.589-micrometer radiation.
    • To investigate sum-frequency generation (SFG) using AgGaS2 and KTP crystals.
    • To compare extracavity and intracavity SFG configurations for efficiency and output characteristics.

    Main Methods:

    • Utilized a singly resonant, synchronously pumped AgGaS2 optical parametric oscillator.
    • Employed a KTP crystal for sum-frequency generation (SFG) of pump (1.064 µm) and signal (1.319 µm) wavelengths.
    • Investigated both extracavity and intracavity SFG arrangements.

    Main Results:

    • Achieved 0.589-micrometer radiation generation.
    • Obtained overall conversion efficiencies of 3.5% (extracavity) and 10.5% (intracavity).
    • Generated near-transform-limited pulses (<50 ps) from 100-ps input pulses.

    Conclusions:

    • Intracavity SFG in an AgGaS2 OPO system offers high conversion efficiency for generating visible radiation.
    • Both spatial orderings of crystals in the intracavity setup yielded comparable results under limited pump power.
    • The method provides a stable and efficient route to short-wavelength generation from established OPO systems.