Showing papers on "Fiber laser published in 1972"
TL;DR: In this paper, Schrotter and Bofilias reported that at least 33 Raman components were observed in the 3300 > Δν> 1650 cm−1 region including shifts due to overtones and combinations, by using a slitwidth of 2 cm− 1 with a 15 m fiber length and a laser power of ∼130 mW.
Abstract: Intense spontaneous Raman radiation has been obtained from C6H6 and C2Cl, by passing the focused beam from an argon ion laser (4880 A, 5 to 250 mW) through filled hollow fused quartz optical fibers having core diameters of ∼75 μm and lengths from 10 to 25 meters. Spectral intensifications by factors of ∼102 to 103 compared to conventional sample techniques have been obtained with the fiber optics method. Raman spectra were recorded with a Cary model 81 spectrophotometer by collecting the divergent radiation emitted from the end of the optical fiber at the focus of the "image slicer." However, the intensification method is general and may be employed with any double or triple monochromator by placing the fiber end near the entrance slit. For C6H6 at least 33 Raman components were observed in the 3300 > Δν> 1650 cm−1 region including shifts due to overtones and combinations, by using a slit-width of 2 cm−1 with a 15 m fiber length and a laser power of ∼130 mW. The Raman spectra from C6H6 were found to be in good agreement with those recently reported by Schrotter and Bofilias. For C2Cl4 intense spectra were also obtained using 2 cm−1 slit-widths with fiber lengths of 25 m and power levels to 250 mW. These spectra augment those obtained earlier by Wittek and indicate five newly observed Raman and infrared coincidences that in several cases may result from the breakdown of D2h selection rules. Details of the fiber optics Raman technique are described.
109 citations
31 citations
TL;DR: In this paper, the authors describe pulse-transmission measurements in 178 m of a liquid-core fiber and explain the considerable pulse broadening (11 ns at the pulse base) in terms of mode delay and mode mixing.
Abstract: Internal self-pulsing of commercially available GaAs lasers produces pulses as short as 100 ps. The simplicity and versatility of such devices make them very useful for fiber-dispersion studies. We describe pulse-transmission measurements in 178 m of a liquid-core fiber and explain the considerable pulse broadening (11 ns at the pulse base) in terms of mode delay and mode mixing.
17 citations
TL;DR: In this article, short pulses from mode-locked lasers (neodynium/yttrium-iron-garnet and krypton) were used to measure mode and material dispersion in 20 m of a multimode fiber at 1060, 647 and 568 nm.
Abstract: Short pulses from mode-locked lasers (neodynium/yttrium-iron-garnet and krypton) were used to measure mode and material dispersion in 20 m of a multimode fibre at 1060, 647 and 568 nm. Uniform illumination of the cone of acceptance at the input caused a 200 ps pulse to broaden to 400 ps.
17 citations
TL;DR: In this article, 200-ps pulses from a krypton laser, mode-locked at three different wavelengths, prove to be adequate for measuring both effects in relatively short fibers (33 m).
Abstract: Mode delay and material dispersion limit the signal bandwidth of potential fiber communication systems. 200-ps pulses from a krypton laser, mode-locked at three different wavelengths, prove to be adequate for measuring both effects in relatively short fibers (33 m). The results are in good agreement with theory.
15 citations