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- Abramson, N, et al.
(author)
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Light-in-flight recording. 5: Theory of slowing down the faster-than-light motion of the light shutter
- 1989
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In: Applied Optics. - 2155-3165. ; 28:4, s. 759-765
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Journal article (peer-reviewed)abstract
- Light-in-flight recording by holography uses a picosecond pulse for the reference beam, which like a sheet of light intersects the hologram plate and produces a sensitivity area that with a speed faster than light moves over the plate like a light shutter. If, however, the front of the reference pulse by diffraction in a grating is tilted relative to its direction of motion, the velocity of the light shutter can be slowed down resulting in increased recording time. The practical result using a reflection grating was a true recording that corresponded to a time compression of two to one. To minimize distortions of the recorded pulse shape we studied intersections that are identical for apparent (ellipsoidal) and true (spheroidal) wavefronts.
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| 4. |
- Edner, H, et al.
(author)
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Atmospheric atomic mercury monitoring using differential absorption lidar techniques
- 1989
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In: Applied Optics. - 2155-3165. ; 28:5, s. 921-930
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Journal article (peer-reviewed)abstract
- Three-dimensional mapping of atmospheric atomic mercury has been performed with lidar techniques, to our knowledge, for the first time. Industrial pollution monitoring, as well as measurements of background concentrations, is reported. High-efficiency frequency doubling of narrowband pulsed dye laser radiation was employed to generate intense radiation at the mercury UV resonance line. Field measurements were supplemented with extensive laboratory investigations of absorption cross sections and interfering lines of molecular oxygen.
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| 8. |
- Kröll, Stefan, et al.
(author)
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Noise characteristics of single shot broadband Raman-resonant CARS with single- and multimode lasers
- 1987
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In: Applied Optics. - 2155-3165. ; 26:6, s. 1068-1073
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Journal article (peer-reviewed)abstract
- A simple model is presented as an aid in understanding, first, the relative noise performance and, second, the noise reduction achievable by referencing, in different experimental approaches to single shot broadband coherent anti-Stokes Raman scattering (CARS). Qualitative agreement is obtained with previous experimental investigations of CARS noise. The broadband dye laser radiation is described as the sum of independent modes with random phases. The dye laser contribution to the CARS noise is then approximately inversely proportional to the square root of the number of dye laser modes generating the detected signal. A fundamental idea is that in Raman resonant spectra only the number of Stokes modes actually participating in driving the Raman resonance should be counted. This means, e.g., that for narrow Raman resonances, as in an atmospheric flame, the noise generated by the dye laser will be higher for a single-mode pump laser than for a multimode pump laser with the experimental CARS configuration normally employed. The implications of the model for the dual broadband type CARS techniques are also discussed.
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| 9. |
- Pettersson, Sven-Göran, et al.
(author)
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Light-in-flight recording. 6: Experiment with view-time expansion using a skew reference wave
- 1989
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In: Applied Optics. - 2155-3165. ; 28:4, s. 766-770
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Journal article (peer-reviewed)abstract
- In normal light-in-flight holography the largest time difference that can be created in the image is when the reference light falls nearly parallel with the photographic plate. In that case, where the pulse front is perpendicular to the direction of propagation, the time scale on the plate is given by the speed of light. Thus the time it takes for the reference light to go from one side of the plate to the other sets the upper limit of the observable time interval. By using a reference light where the pulse front is leaning backward, this view time can be increased several times.
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