OPTICAL DIFFERENCE FREQUENCY GENERATION OF FAR INFRARED RADIATION

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Three investigations of difference frequency generation (DFG) of far-infrared radiation by optical mixing are described: a theory of DFG by monochromatic, focused Gaussian pump laser beams, a theory of DFG by a picosecond pump laser pulse, and an experiment using ruby-pumped dye lasers. First, the theory of far-infrared generation by optical mixing of monochromatic, focused Gaussian beams in a uniaxial crystal is developed, taking into account the effects of diffraction, absorption, double refraction, and multiple reflections and total reflection at the boundary surfaces. (Reflection and transmission coefficients of a uniaxial crystal slab are derived by a new matrix technique.) Results ... continued below

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179 p.

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Morris, J.R. July 1, 1977.

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Three investigations of difference frequency generation (DFG) of far-infrared radiation by optical mixing are described: a theory of DFG by monochromatic, focused Gaussian pump laser beams, a theory of DFG by a picosecond pump laser pulse, and an experiment using ruby-pumped dye lasers. First, the theory of far-infrared generation by optical mixing of monochromatic, focused Gaussian beams in a uniaxial crystal is developed, taking into account the effects of diffraction, absorption, double refraction, and multiple reflections and total reflection at the boundary surfaces. (Reflection and transmission coefficients of a uniaxial crystal slab are derived by a new matrix technique.) Results of numerical calculations are presented. Focusing the pump beams appreciably enhances the far-infrared output despite the strong far-infrared diffraction. In a 1-cm long crystal, the optimum focal spot size is approximately equal to or smaller than the far-infrared wavelength for output frequencies less than 100 cm{sup -1}. Double refraction of the pump beams is relatively unimportant. Both far-infrared absorption and boundary reflections have major effects on the far-infrared output and its angular distribution. The former is often the factor which limits the output power. We show that a simple model treating the nonlinear polarization as a constant lie-radius Gaussian distribution of radiating dipoles adequately describes the effect of pump-beam focusing. We also compare the results of our calculations with those for second-harmonic generation. Second, a theoretical calculation of far-infrared power spectra generated by picosecond pulses in a nonlinear crystal is developed. The results are illustrated with two practical examples: LiNbO{sub 3} slabs oriented for rectification of the optical e-ray and for beating of the optical o-ray with the optical e-ray. The former is phase matched at 0 cm{sup -1}; the latter, at both the forward-(FCPM) and backward-collinear phase-matching frequencies. The one-dimensional, time-dependent electric field is discussed and then used to explain the origin of the oscillation periods in the power spectra. Finally, a series of experiments using a pair of ruby-pumped dye lasers and a novel dual-frequency dye laser system is described. With these two laser systems, continuously tunable far-infrared radiation in the frequency range 20 to 190 cm{sup -1} was generated. Forward-, backward-, and non-collinear phasematching in LiNbO{sub 3} at frequencies between 20 and 160 cm{sup -1} were investigated; 90{sup o} noncritical FCPM was also observed in ZnO at 190 cm{sup -1}, CdS at 180 cm{sup -1}, and ZnS at 91 cm{sup -1}. The highest peak power ({approx}200 mW) and the broadest tuning range using a single crystal sample (40 to 160 cm{sup -1}) were obtained with noncollinear phase matching in LiNbO{sub 3}.

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179 p.

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  • Related Information: Designation of Academic Dissertation: Doctoral Thesis; Academic Degree: Ph.D.; Name of Academic Institution: UC Berkeley

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  • Report No.: LBL-6632
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/991950 | External Link
  • Office of Scientific & Technical Information Report Number: 991950
  • Archival Resource Key: ark:/67531/metadc1014709

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 1, 1977

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 17, 2017, 6:24 p.m.

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Morris, J.R. OPTICAL DIFFERENCE FREQUENCY GENERATION OF FAR INFRARED RADIATION, thesis or dissertation, July 1, 1977; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1014709/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.