Anomale Dispersion im Natriumdampf

Roschdestwensky, D.

doi:10.1002/andp.19123441203

Cited by 52 publications

(13 citation statements)

References 15 publications

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“…Fig 6 shows a spectrum of the absolute absorption coefficient of a sodium -argon mixture measured at 900K +10K −50K cell temperature. The Ar pressure is 401 ± 0.5 Torr, which gives argon density 4.3x10 18 cm −3 at 900 K temperature. Sodium density is measured as 1.00 ± 0.04 x 10 16 cm −3 .…”

Section: Measurement Resultsmentioning

confidence: 99%

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Precision measurements of sodium-sodium and sodium-noble gas molecular absorption

Shurgalin

Parkinson

Yoshino

et al. 2000

Meas. Sci. Technol.

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Abstract.Experimental apparatus and measurement technique are described for precision absorption measurements in sodium -noble gas mixtures. The absolute absorption coefficient is measured in the wavelength range from 425 nm to 760 nm with ±2% uncertainty and spectral resolution of 0.02 nm. The precision is achieved by using a specially designed absorption cell with an accurately defined absorption path length, low noise CCD detector and double-beam absorption measurement scheme. The experimental set-up and the cell design details are given. Measurements of sodium atomic number density with ±5% uncertainty complement absorption coefficient measurements and allow derivation of the reduced absorption coefficients for certain spectral features. The sodium atomic number density is measured using the anomalous dispersion method. The accuracy of this method is improved by employing a least-squares fit to the interference image recorded with CCD detector and the details of this technique are given. The measurements are 1 aimed at stringent testing of theoretical calculations and improving the values of molecular parameters used in calculations.

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Section: Measurement Resultsmentioning

confidence: 99%

“…The atomic density for noble gas is calculated from pressure and temperature using the ideal gas relationship and the sodium density is measured by the 'hook' method [17][18][19]. Fig.…”

Section: Measurement Techniquementioning

confidence: 99%

Precision measurements of sodium-sodium and sodium-noble gas molecular absorption

Shurgalin

Parkinson

Yoshino

et al. 2000

Meas. Sci. Technol.

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“…L. Puccianti published his first measurement results about the anomalous dispersion of oxy-hemoglobin [34] in 1901. Eleven years later, D. Roschdestwensky used essentially the same technique to measure the oscillator strengths of atomic transitions in sodium vapor [35]. In his experiments, he placed a test tube containing metal vapor into one arm of a Jamin-or Mach-Zehnder interferometer, and empty tube in the other in order to compensate the dispersion of the end-windows.…”

Section: Historical Outlookmentioning

confidence: 99%

What We Can Learn about Ultrashort Pulses by Linear Optical Methods

2013

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Spatiotemporal compression of ultrashort pulses is one of the key issues of chirped pulse amplification (CPA), the most common method to achieve high intensity laser beams. Successful shaping of the temporal envelope and recombination of the spectral components of the broadband pulses need careful alignment of the stretcher-compressor stages. Pulse parameters are required to be measured at the target as well. Several diagnostic techniques have been developed so far for the characterization of ultrashort pulses. Some of these methods utilize nonlinear optical processes, while others based on purely linear optics, in most cases, combined with spectrally resolving device. The goal of this work is to provide a review on the capabilities and limitations of the latter category of the ultrafast diagnostical methods. We feel that the importance of these powerful, easy-to-align, high-precision techniques needs to be emphasized, since their use could gradually improve the efficiency of different CPA systems. We give a general description on the background of spectrally resolved linear interferometry and demonstrate various schematic experimental layouts for the detection of material dispersion, angular dispersion and carrier-envelope phase drift. Precision estimations and discussion of potential applications are also provided.

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“…However, due to the extremely small refractive index change associated with the absorption of trace amounts of molecular species, little progress has been made to adopt this approach to routine molecular detection. Interferometric methods such as the "hook" method [4], developed at the early stage of gaseous sample dispersion studies, have been used until now [5]. Other methods inherited from the "hook" technique have also been investigated: Examples include interference fringe shift or slope measurements [6], holographic measurements [7], or applications of detector focal plane arrays and digital image processing [5].…”

Section: Introductionmentioning

confidence: 99%

Molecular dispersion spectroscopy for chemical sensing using chirped mid-infrared quantum cascade laser

2010

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A spectroscopic method of molecular detection based on dispersion measurements using a frequency-chirped laser source is presented. An infrared quantum cascade laser emitting around 1912 cm(-1) is used as a tunable spectroscopic source to measure dispersion that occurs in the vicinity of molecular ro-vibrational transitions. The sample under study is a mixture of nitric oxide in dry nitrogen. Two experimental configurations based on a coherent detection scheme are investigated and discussed. The theoretical models, which describe the observed spectral signals, are developed and verified experimentally. The method is particularly relevant to optical sensing based on mid-infrared quantum cascade lasers as the high chirp rates available with those sources can significantly enhance the magnitude of the measured dispersion signals. The method relies on heterodyne beatnote frequency measurements and shows high immunity to variations in the optical power received by the photodetector.

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Anomale Dispersion im Natriumdampf

Cited by 52 publications

References 15 publications

Precision measurements of sodium-sodium and sodium-noble gas molecular absorption

Precision measurements of sodium-sodium and sodium-noble gas molecular absorption

What We Can Learn about Ultrashort Pulses by Linear Optical Methods

Molecular dispersion spectroscopy for chemical sensing using chirped mid-infrared quantum cascade laser

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