Liquid Instruments

Tag: digital lock-in amplifier

  • An ultrafast introduction to quantum optics

    An ultrafast introduction to quantum optics

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    by

    jball
    in

    Quantum optics as a concept dates back to either 1900 or 1905, years when groundbreaking work in the realm of quantum mechanics was published by Max Planck and Albert Einstein, respectively. In Planck’s case, he was working on a discrepancy that later became artfully known as the “ultraviolet catastrophe.” Planck’s solution to this problem, in…

  • What’s a digital lock-in amplifier, and how does it work?

    What’s a digital lock-in amplifier, and how does it work?

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    by

    jpatterson
    in ,

    Digital lock-in amplifiers help scientists and engineers make phase-sensitive measurements of incredibly small alternating current (AC) signals, sometimes buried beneath the noise floor (Figure 1). By providing a lock-in amplifier with a reference signal, a researcher can extract phase and amplitude information from a signal of interest in the same frequency region, even in an…