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  • 1
    Electronic Resource
    Electronic Resource
    Responses of the infrared sensilla of Melanophila acuminata (Coleoptera: Buprestidae) to monochromatic infrared stimulation (2000)
    Springer
    Journal of comparative physiology 186 (2000), S. 543-549 
    Details
    ISSN: 1432-1351
    Keywords: Key wordsMelanophila ; Infrared receptor ; Mechanoreceptor ; Insect cuticle ; Remote sensing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The pit organs of the beetle Melanophilaacuminata were stimulated with monochromatic infrared radiation using a continuous wave CO overtone infrared laser. Best sensitivity was in the wavelength range 2.8–3.5 μm. In this range a stimulus intensity of 14.7 mW cm−2 was sufficient to generate single action potentials. At a wavelength of 5 μm receptor performance significantly decreased. An increase in stimulus intensity caused a decrease in response latency and an increase in the number of action potentials elicited. At a given wavelength (3.4 μm) the dynamic amplitude range of action potential responses covered 12 dB. At high stimulus intensities (94.2 mW cm−2) a stimulus duration of 4 ms was sufficient to generate one to two action potentials and a stimulus duration of 60 ms already caused response saturation (with up to nine action potentials). In a repetitive stimulus regime distinct receptor potentials were visible up to a frequency of 600 Hz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590000109
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  • 2
    Electronic Resource
    Electronic Resource
    Optically stabilized tunable diode-laser system for saturation spectroscopy (1995)
    Springer
    Applied physics 60 (1995), S. 31-37 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Px ; 42.62.Fi ; 07.65.Gj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an optically stabilized lead-salt diode-laser system which is the nucleus of a very-high-resolution instrument for sub-Doppler molecular spectroscopy in the mid-infrared. By application of external optical feedback, we have narrowed the diode-laser linewidth by two orders of magnitude, yielding a spectral width of less than 200 kHz. The diode- laser frequency is stabilized and controlled via the external reflector by variable-frequency offset-locking the diode-laser to a CO laser frequency. This substantial improvement in the spectral properties enabled us to perform a Lamb-dip experiment on a carbonyl sulfide (OCS) absorption line near 1985 cm−1. We were able to detect a saturated dispersion signal at low pressure (5 Pa) with a signal-to-noise ratio of several thousand. The present paper describes the unique features of the optically stabilized tunable diode-laser system and its use as a spectroscopic tool for sub-Doppler applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082069
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Very high resolution CO laser spectrometer and first sub-Doppler line-shape studies near 60 THz (5 μm) (1997)
    Springer
    Applied physics 65 (1997), S. 25-32 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 33.70.Jg; 39.30.+w; 07.57.Ty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 laser standards. Using this technique, we can tune the CO laser frequency with absolute frequency control within the gain profile of each laser transition. The frequency uncertainty is smaller than 15 kHz, corresponding to Δν/ν=2.5×10-10. Moreover, we obtain a reduction of the CO laser linewidth by a factor of 2 down to 65 kHz, corresponding to a spectral resolution of δν/ν=1×10-9. With this outstanding accuracy and resolution we studied the shape of saturation dips in rovibrational lines of CO and carbonyl sulfide (OCS) at low pressure (〈5 Pa). The self-pressure-broadening rate of CO was found to be γc=+83(7) kHz/Pa in this pressure region. This value is about four times higher than values resulting from previous measurements at much higher pressures. To our knowledge the measurements described here are the first line-shape studies with sub-Doppler resolution in the 5 μm spectral region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050244
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  • 4
    Electronic Resource
    Electronic Resource
    Frequency measurements of saturated-fluorescence-stabilized CO2 laser lines: comparison with an OsO4-stabilized CO2 laser standard (1998)
    Springer
    Applied physics 67 (1998), S. 217-221 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 06.20.-f; 07.57.Ty; 33.70.Jg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 4 frequency grid, to test the performance of the saturated fluorescence method for CO2 laser frequency stabilization. The Allan variance for the saturated-fluorescence-stabilized CO2 laser reached 60 Hz for an integration time of 300 s. We also performed three absolute measurements of CO2 laser frequencies stabilized by the saturated fluorescence method, with a sub-kHz accuracy. We obtained a 1.7 kHz redshift of the CO2 saturated fluorescence lines, which we attribute essentially to pressure. This is in contradiction with the previous observation of a blueshift [K.L. SooHoo, C. Freed, J.E.  Thomas, H.A. Haus: Phys. Rev. Lett. 53, 1437 (1984)]. Furthermore, significant deviations of the measured frequencies from the data of Maki et al. [A.G. Maki, C.-C. Chou, K. Evenson, L.R. Zink, J.T. Shy: J. Mol. Spec. 167, 211 (1994)] demonstrate the need for a new calibration of the CO2 frequency grid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050496
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  • 5
    Electronic Resource
    Electronic Resource
    Extended-cavity grating-tuned operation of mid-infrared InAsSb diode lasers (1998)
    Springer
    Applied physics 66 (1998), S. 277-281 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.55.Px; 07.57.Hm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 cryostat that permits placement of both the collimation optics and the extended-cavity elements within a vacuum chamber. We have observed tuning of the laser frequency over a 1.44 THz (48 cm-1) range by rotation of the external grating. This result was obtained without anti-reflection coating of the laser output facet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050389
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    High-resolution cavity leak-out absorption spectroscopy in the 10-μm region (1999)
    Springer
    Applied physics 68 (1999), S. 243-249 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 39.30.+w; 42.62.Fi; 07.57.Ty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 laser. After excitation, the laser power is turned off for a short time and the subsequent decay of the radiation stored in the cavity is observed via detection of the light leaking out through one of the cavity mirrors. Measurement of the decay time allows one to determine the photon losses und thus to detect weakly absorbing species inside the cavity. Since the cavity is frequency-locked to the laser the decay time can be probed with a high repetition rate, basically limited by the sampling rate of the analog-to-digital converter. This approach is closely related to cavity ring-down spectroscopy with pulsed lasers, but exhibits several advantages concerning spectral resolution and detection sensitivity. As a practical example we demonstrate monitoring of trace amounts of ethylene. Using R=99.5% mirrors we achieve a detection limit of 1 ppb ethylene (integration time: 100 s) corresponding to absorption losses of 3×10-8 /cm. Further improvement is feasible when mirrors with higher reflectivity become available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050613
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    Paper (German National Licenses)
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