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Power Measurements

  • Chapter
Millimetre and Submillimetre Wavelength Lasers

Part of the book series: Springer Series in Optical Sciences ((SSOS,volume 61))

Abstract

The lowest intensities of (sub)mm laser emission usually considered to be useful are at the microwatt level, and such emission can easily be detected with a Golay cell [4.1] or pyroelectric detector [4.2], especially when chopping and synchronous detection is used. These devices were not designed for such long wavelengths, however, and in particular they have very small entrance apertures through which (sub)mm radiation couples in a fairly unpredictable way. The Golay cell is furthermore totally saturated by radiation at the level of a few tens of microwatts, if properly coupled. This means that such detectors are unsuitable for absolute power measurement, unless considerable effort is made to calibrate them. The majority of reports of new (sub)mm laser lines therefore either give no indication of strengths, or else give relative indications such as “very strong”, “medium”, “very weak”, etc.

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  1. Kapteyn Sterrenwacht, Rijksuniversiteit te Groningen, NL-9301 KA, Roden, Netherlands

    Dr. Nigel G. Douglas

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© 1989 Springer-Verlag Berlin Heidelberg

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Douglas, N.G. (1989). Power Measurements. In: Millimetre and Submillimetre Wavelength Lasers. Springer Series in Optical Sciences, vol 61. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-46095-4_4

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  • DOI: https://doi.org/10.1007/978-3-540-46095-4_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-14492-3

  • Online ISBN: 978-3-540-46095-4

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