Studies of crystals and vapours for infrared non-linear optics
Studies of crystals and vapours for infrared non-linear optics
Methods of generating tunable coherent infrared radiation by nonlinear optical frequency conversion are reviewed, and a comparision made between the use of crystals and vapours for this purpose. Among the crystals chalco pyrite semiconductors are studied in detail. A cubic model is made which, allows predictions of ionicity, effective charge, dispersion and infrared transmission limit. Also the bond ionicities are calculated. They are used to estimate Miller's delta values according to the bond charge model. Design details are given for a nitrogen laser pumped dye laser with a diffraction limited linearly polarized output and with a narrow bandwidth of - 0.1 cm. Single mode operation has been observed and frequency stability of the laser is analysed. The dye laser is employed for studying nonlinear optical effects in alkali metal vapours. Stimulated electronic Raman scattering has been produced in potassium and caesium vapour. The measured peak infrared power is inexcess of 1 kW and the tuning range extends over 1000,cm between 2.56 and 3.5 µm. Potential applications in its spectroscopy have been demonstrated by running an absorption spectrum of COTwo photon resonant four wave mixing has been studied both theoretically and experimentally. The mixing efficiency is severely limited by competition with Raman scattering. A tuning range of 1.9 to 20 µm has been achieved with measured powers of 20...30 times greater than previously reported. More efficient four wave mixing schemes are suggested.
University of Southampton
Kärkkäinen, Pertti Antero
1975
Kärkkäinen, Pertti Antero
Kärkkäinen, Pertti Antero
(1975)
Studies of crystals and vapours for infrared non-linear optics.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Methods of generating tunable coherent infrared radiation by nonlinear optical frequency conversion are reviewed, and a comparision made between the use of crystals and vapours for this purpose. Among the crystals chalco pyrite semiconductors are studied in detail. A cubic model is made which, allows predictions of ionicity, effective charge, dispersion and infrared transmission limit. Also the bond ionicities are calculated. They are used to estimate Miller's delta values according to the bond charge model. Design details are given for a nitrogen laser pumped dye laser with a diffraction limited linearly polarized output and with a narrow bandwidth of - 0.1 cm. Single mode operation has been observed and frequency stability of the laser is analysed. The dye laser is employed for studying nonlinear optical effects in alkali metal vapours. Stimulated electronic Raman scattering has been produced in potassium and caesium vapour. The measured peak infrared power is inexcess of 1 kW and the tuning range extends over 1000,cm between 2.56 and 3.5 µm. Potential applications in its spectroscopy have been demonstrated by running an absorption spectrum of COTwo photon resonant four wave mixing has been studied both theoretically and experimentally. The mixing efficiency is severely limited by competition with Raman scattering. A tuning range of 1.9 to 20 µm has been achieved with measured powers of 20...30 times greater than previously reported. More efficient four wave mixing schemes are suggested.
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Published date: 1975
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Local EPrints ID: 462836
URI: http://eprints.soton.ac.uk/id/eprint/462836
PURE UUID: 532b2da1-fe03-4ac4-9dd6-151b295731ef
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Date deposited: 04 Jul 2022 20:13
Last modified: 04 Jul 2022 20:13
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Author:
Pertti Antero Kärkkäinen
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