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相关概念视频

Upsampling01:22

Upsampling

204
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...
204

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Updated: Jun 7, 2025

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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集成的,明亮的宽带,双色参数下转换源.

René Pollmann, Franz Roeder, Victor Quiring

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    概括
    此摘要是机器生成的。

    研究人员开发了一种明亮的宽带集成量子光源,使用尼酸盐波导. 这种新源使高流量,时间频率纠的光子对成为先进量子应用的关键.

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    科学领域:

    • 量子光学就是量子光学.
    • 综合光子学 综合光子学
    • 非线性光学是一种非线性光学.

    背景情况:

    • 宽带量子光对于量子计量学和光谱学至关重要.
    • 纠的两光子吸收需要高光子流和时间频率纠.
    • 传统的自发参数向下转换 (SPDC) 源在波长和光子分裂方面存在局限性.

    研究的目的:

    • 为了展示一种新的集成双色SPDC源.
    • 为了实现量子应用的高亮度和宽带宽.
    • 为了在光子对中产生强大的时频纠.

    主要方法:

    • 使用了一种与组速度匹配的酸波导.
    • 使用连续波 (CW) 激光光用于.
    • 将窄带光转换为宽带脉冲.

    主要成果:

    • 实现了异常亮度 (1.52 × 10^6对/mW/GHz) 和大带宽 (7.8 THz FWHM).
    • 生成的光子对具有较短的相关时间 (~120 fs).
    • 保持狭窄的带宽 (<1MHz),产生强大的时间频率纠.

    结论:

    • 集成源为量子计量学和光谱学提供了强大的资源.
    • 展示的技术克服了散装晶体SPDC的局限性.
    • 该源可适应各种中心波长,并提供高性能.