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相关概念视频

Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...

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基于SNSPD的探测器系统用于NASA的深空光通信项目.

Emma E Wollman, Jason P Allmaras, Andrew D Beyer

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    |January 29, 2025
    PubMed
    概括

    美国国家航空航天局NASA NASA

    科学领域:

    • 量子光学就是一个量子光学.
    • 探测器技术 探测器技术
    • 光学通信是指光学通信的应用.

    背景情况:

    • 超导纳米线单光子探测器 (SNSPD) 对于敏感的光学测量至关重要.
    • 美国宇航局的深空光学通信 (DSOC) 项目需要先进的探测器来进行深空通信.

    研究的目的:

    • 为NASA的DSOC项目开发和描述一个自由空间合的超导纳米线单光子探测器阵列.
    • 作为海尔望远镜DSOC地面接收器的主要下联探测器.

    主要方法:

    • 一个64像素的WSi SNSPD阵列是由16个共像素的四个象限制造的.
    • 该阵列被集成到冷光学系统中,用于过和聚焦.
    • 检测器的性能被评估为系统检测效率,错误计数率,定时动和计数率.

    主要成果:

    • 在1550 nm. 达到76%的峰值系统检测效率.
    • 在整个阵列中显示了低背景限制的错误计数率,为3.7kcps.
    • 显示的定时动低于120ps的FWHM,最大计数速率约为1Gcps.

    结论:

    • 开发的SNSPD阵列满足了对深空光通信的苛刻要求.

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  • 这种探测器技术对于在巨大的星际距离上实现高带宽通信至关重要.
  • 哈尔望远镜的成功实施为未来的光通信任务铺平了道路.