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Dr. Markus Horstjann (Germany)

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Latest Blog Posts

  • 19.10.2009: New setup, removed optics, higher stability

    I’ve removed an anamorphotic prism pair, a lambda/2 plate and a polarizing beam splitter which were previously between the laser and the cavity. Also, a heavier piezo has been used for the latest setup. This movie gives an overview about these changes. Click here for the OFCEAS signals, and here for the setup changes.
    Source: Optical spectroscopy

  • 12.05.2009: Vibration tests

    I’ve done some quick vibration testings with the 19″ detector setup. Attached are two results with different vibration dampeners. The first is using 6 “mechanical” dampeners which are connected to the breadboard and the 19″ drawer bottom. The second shows the use of a polyurethane sheet (6mm thick) between breadboard and drawer bottom. ofceas_vibrationsdaempfer_kurz ofceas_sorbothane_kurz You’ll notice that [...]
    Source: Optical spectroscopy

  • 27.02.2009: Best signal quality so far… with minimum setup

    About the noise I mentioned in the previous post: It seems that this is strongly affected by how the resonator is fastened to the laser table. I was able to reduce this noise by stabilizing the end flanges of the resonator and realigning. I will test this theory by removing those again and let you [...]
    Source: Optical spectroscopy

  • 23.02.2009: Beat signals

    I’ve seen beat signals appearing in the OFCEAS signals. I think I’ve always seen them but not as pronounced as this one (piezo being manually detuned). The beatnotes anticorrelate with laser scan speed: laser scan frequency: 18Hz — 5,4 Hz — 1,8 Hz beatnote frequency: 10GHz — 3,2 GHz — [...]
    Source: Optical spectroscopy

  • 23.02.2009: New and better signals

    I’ve tried out a really slim setup using only one mirror (with piezo) and a pellicle beamsplitter. Distance laser-cavity and between cavity mirrors is 41cm. Look at the nice signals. Zooming in yields Also, I’ve analyzed the decay of these signals, which I initially believed to be exponential decays. However, this is clearly not the case.
    Source: Optical spectroscopy

  • 28.01.2009: Optical feedback effect

    I’m adding a graph here showing the optical feedback effect I’ve seen so far. The red line shows a 1GHz low-finesse etalon signal, which shows a sine wave if the laser is scanned with the piezo. Note the small dents in the sine wave, this is where the optical feedback kicks in and forces the laser [...]
    Source: Optical spectroscopy

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  • [24.03.2018] New article published in Journal of Geodynamics : Crustal structure of the Mendeleev Rise and the Chukchi Plateau (Arctic [...] more
  • [24.03.2018] New article published in Energy and Buildings : Development and optimization of a new ventilated brick wall: CFD analysis [...] more
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