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  • 07.65.-b  (1)
  • 35.10.Bg  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Frequency- and wavelength-modulation spectroscopies: Comparison of experimental methods using an AlGaAs diode laser (1993)
    Springer
    Applied physics 56 (1993), S. 118-122 
    Details
    ISSN: 1432-0649
    Keywords: 07.65.-b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low-wavelength modulation (1 kHz), high-wavelength modulation (100 MHz) and two-tone frequency modulation (390±5 MHz) spectroscopies are systematically compared by measuring the minimum detectable absorption achieved using an AlGaAs diode laser tuned on a third-overtone methane transition at 886 nm. From the S/N behavior has been extrapolated a minimum relative absorption (1 Hz of bandwidth) of 4.5(1)×10−7 for the LMW, 9.7(3)×10−8 for the HWM and 6.4(2)×10−8 for the TTFM. In the LWM case the detection-limit value is represented by the laser amplitude 1/f excess noise, while for the high-frequency detection techniques this contribution is negligible with respect to other noise sources. These detection limits well agree with the calculated “quantum limited” values based on measured laser power, modulation index, noise figure of the electronic components, and other parameters of the apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325250
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  • 2
    Electronic Resource
    Electronic Resource
    Hyperfine structure and isotope shift of the 3s-3p transitions of atomic oxygen (1993)
    Springer
    The European physical journal 25 (1993), S. 191-199 
    Details
    ISSN: 1434-6079
    Keywords: 32.30.Jc ; 35.10.Bg ; 35.10.Fk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using high-resolution saturation spectroscopy, by means of both double heterostructure and multiple quantum-well AlGaAs diode lasers, we investigate the isotope shifts and the hyperfine structure in the 3s-3p transitions of the triplet and quintet systems of atomic oxygen. From the analysis of the signals from17O we can deduce precise values for the hyperfine structure magnetic dipole constants. A theoretical analysis allows us to bring into evidence core polarization effects in the hyperfine structure. By heterodyning two frequency locked lasers, we perform a direct frequency measurement of the isotope effect on the3 S 1→3 P 1,2,0 transitions. From the comparison with similar accuracy data on the corresponding quintet transitions, an upper bound to the size of the nuclear volume effect is given, and precise values for the specific mass contributions are consequently obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426879
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