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Related Concept Videos

Downsampling01:20

Downsampling

512
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
512
Upsampling01:22

Upsampling

510
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...
510

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Pump depletion in parametric down-conversion with low pump energies.

Jefferson Flórez, Jeff S Lundeen, Maria V Chekhova

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    |August 1, 2020
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    Summary
    This summary is machine-generated.

    We achieved efficient parametric down-conversion with low pump power, reaching 33% efficiency and observing pump depletion. This highlights the interaction between light beams in nonlinear optical crystals.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Parametric down-conversion (PDC) is a key process for generating quantum light.
    • Achieving high efficiency and pump depletion typically requires high pump powers.

    Purpose of the Study:

    • To demonstrate efficient PDC generation at low pump powers.
    • To investigate pump depletion and photon statistics in a simple experimental setup.

    Main Methods:

    • Utilizing a bulk periodically poled lithium niobate (PPLN) crystal.
    • Focusing low-power pump beams (100 µW) into the PPLN crystal.
    • Observing changes in photon number statistics.

    Main Results:

    • Efficient PDC generation with up to 33% conversion efficiency.
    • Observation of pump depletion at low pump powers.
    • Changes in photon number statistics indicating nonlinear interactions.

    Conclusions:

    • High-gain PDC is achievable with low pump powers.
    • The interplay between pump and down-converted beams is crucial for efficient PDC.
    • The experimental setup offers a simple yet effective method for generating quantum light.