Optical power calibrator based on a stabilized green He-Ne laser and a cryogenic absolute radiometer

    Research output: Contribution to journalArticleScientificpeer-review

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    Abstract

    An optical power calibrator is described whose overall calibration uncertainty is less than 10/sup -4/ for an optical power of 0.13 mW.
    The laser light source of the system operates at a wavelength of 543.5 nm, being close to the wavelength at which the candela is defined, 555 nm. A stable optical power is achieved by stabilizing the intensity and the frequency of a green He-Ne laser. The optical power is detected by a cryogenic absolute radiometer based on the principle of electrical substitution radiometry. It can be used to measure up to 0.5 mW in the visible and near-infrared region with a 3 sigma uncertainty of about 5*10/sup -5/.
    The factors limiting the overall uncertainty of the calibrator are analyzed: the conductance fluctuations of the temperature sensor in the absorption cavity and the beam scatter are found to be the most significant error sources.
    Limited absorptivity of the cavity (0.99998) and the background radiation cause additional uncertainty. The system is controlled by a microcomputer with self-check and autocalibration features.
    Original languageEnglish
    Pages (from-to)558-564
    JournalIEEE Transactions on Instrumentation and Measurement
    Volume38
    Issue number2
    DOIs
    Publication statusPublished - 1989
    MoE publication typeA1 Journal article-refereed

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    Radiometers
    radiometers
    Cryogenics
    cryogenics
    cavities
    Lasers
    microcomputers
    background radiation
    temperature sensors
    wavelengths
    lasers
    absorptivity
    light sources
    substitutes
    Wavelength
    Radiometry
    causes
    Temperature sensors
    Microcomputers
    Light sources

    Cite this

    @article{22e70783de0241c2b2d1d33647b4fd31,
    title = "Optical power calibrator based on a stabilized green He-Ne laser and a cryogenic absolute radiometer",
    abstract = "An optical power calibrator is described whose overall calibration uncertainty is less than 10/sup -4/ for an optical power of 0.13 mW. The laser light source of the system operates at a wavelength of 543.5 nm, being close to the wavelength at which the candela is defined, 555 nm. A stable optical power is achieved by stabilizing the intensity and the frequency of a green He-Ne laser. The optical power is detected by a cryogenic absolute radiometer based on the principle of electrical substitution radiometry. It can be used to measure up to 0.5 mW in the visible and near-infrared region with a 3 sigma uncertainty of about 5*10/sup -5/. The factors limiting the overall uncertainty of the calibrator are analyzed: the conductance fluctuations of the temperature sensor in the absorption cavity and the beam scatter are found to be the most significant error sources. Limited absorptivity of the cavity (0.99998) and the background radiation cause additional uncertainty. The system is controlled by a microcomputer with self-check and autocalibration features.",
    author = "Timo Varpula and Heikki Sepp{\"a} and Juha-Matti Saari",
    year = "1989",
    doi = "10.1109/19.192347",
    language = "English",
    volume = "38",
    pages = "558--564",
    journal = "IEEE Transactions on Instrumentation and Measurement",
    issn = "0018-9456",
    publisher = "IEEE Institute of Electrical and Electronic Engineers",
    number = "2",

    }

    Optical power calibrator based on a stabilized green He-Ne laser and a cryogenic absolute radiometer. / Varpula, Timo; Seppä, Heikki; Saari, Juha-Matti.

    In: IEEE Transactions on Instrumentation and Measurement, Vol. 38, No. 2, 1989, p. 558-564.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Optical power calibrator based on a stabilized green He-Ne laser and a cryogenic absolute radiometer

    AU - Varpula, Timo

    AU - Seppä, Heikki

    AU - Saari, Juha-Matti

    PY - 1989

    Y1 - 1989

    N2 - An optical power calibrator is described whose overall calibration uncertainty is less than 10/sup -4/ for an optical power of 0.13 mW. The laser light source of the system operates at a wavelength of 543.5 nm, being close to the wavelength at which the candela is defined, 555 nm. A stable optical power is achieved by stabilizing the intensity and the frequency of a green He-Ne laser. The optical power is detected by a cryogenic absolute radiometer based on the principle of electrical substitution radiometry. It can be used to measure up to 0.5 mW in the visible and near-infrared region with a 3 sigma uncertainty of about 5*10/sup -5/. The factors limiting the overall uncertainty of the calibrator are analyzed: the conductance fluctuations of the temperature sensor in the absorption cavity and the beam scatter are found to be the most significant error sources. Limited absorptivity of the cavity (0.99998) and the background radiation cause additional uncertainty. The system is controlled by a microcomputer with self-check and autocalibration features.

    AB - An optical power calibrator is described whose overall calibration uncertainty is less than 10/sup -4/ for an optical power of 0.13 mW. The laser light source of the system operates at a wavelength of 543.5 nm, being close to the wavelength at which the candela is defined, 555 nm. A stable optical power is achieved by stabilizing the intensity and the frequency of a green He-Ne laser. The optical power is detected by a cryogenic absolute radiometer based on the principle of electrical substitution radiometry. It can be used to measure up to 0.5 mW in the visible and near-infrared region with a 3 sigma uncertainty of about 5*10/sup -5/. The factors limiting the overall uncertainty of the calibrator are analyzed: the conductance fluctuations of the temperature sensor in the absorption cavity and the beam scatter are found to be the most significant error sources. Limited absorptivity of the cavity (0.99998) and the background radiation cause additional uncertainty. The system is controlled by a microcomputer with self-check and autocalibration features.

    U2 - 10.1109/19.192347

    DO - 10.1109/19.192347

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    JO - IEEE Transactions on Instrumentation and Measurement

    JF - IEEE Transactions on Instrumentation and Measurement

    SN - 0018-9456

    IS - 2

    ER -