Researcher:
Sundheimer, Michael

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Michael

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Sundheimer

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Sundheimer, Michael

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1996 - 19996

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Researcher Of Publications: search.filters.isAuthorOfPublication.57e97222-7886-4228-9d85-ec092af198de

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    Comparison between difference-frequency generation and parametric fluorescence in quasi-phase-matched lithium niobate stripe waveguides
    (IEEE, 1996) Baldi, P.; El Hadi, K.; De Micheli, M. P.; Ostrowsky, D.B.; Department of Physics; Sundheimer, Michael; Faculty Member; Department of Physics; College of Sciences; N/A
    Tuning curves and gain are two relevant parameters for integrated optical parametric oscillators. We show in this paper that they can be determined with a good precision without building a high-finesse cavity by measurement of the optical parametric fluorescence and difference-frequency generation. In the first part of this paper, we compare theoretically the guided optical parametric fluorescence and the guided difference-Frequency generation in the quasi-phase matching configuration. In the second part, we compare experimental results on optical parametric fluorescence in the 1.2-2.2-μm region and optical difference-frequency generation from a 1.55-μm laser diode using a pump wavelength between 775-795 nm in quasi-phase-matched lithium niobate stripe waveguides. This comparison shows that the gain measured by both methods is identical, but, while parametric fluorescence allows us to obtain the quasi-phase-matching curve, the difference-frequency generation gives a simpler and more accurate measurement of the gain. The combination of these two techniques provides therefore a powerful tool for evaluating the different fabrication processes of the nonlinear waveguides, without actually fabricating a parametric oscillator.
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    Femtosecond optical parametric oscillator based on periodically poled KTiOPO(4)
    (1998) Kartaloğlu, Tolga; Köprülü, Kahraman G; Aytur, Orhan; Risk, William; Department of Physics; Sundheimer, Michael; Faculty Member; Department of Physics; College of Sciences; N/A
    We report a femtosecond optical parametric oscillator based on a periodically poled KTiOPO4 crystal for which quasi-phase matching is achieved with a 24−µm poling period. The singly resonant parametric oscillator, synchronously pumped by a Ti:sapphire laser at a wavelength of 758 nm, generates a signal at 1200 nm and an idler at 2060 nm. The maximum signal power conversion efficiency of the device is 22% with a pump depletion of 69%. We tune the signal wavelength over a 200-nm band by changing the cavity length. In addition, pump wavelength tuning provides output tunability in the 1000–1235-nm range. 
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    Infrared parametric fluorescence in segmented KTP channel waveguides
    (Optica Publishing Group, 1998) Aschieri Pierre; Baldi, Pascal; Bierlein, John; Department of Physics; Sundheimer, Michael; Faculty Member; Department of Physics; College of Sciences; N/A
    In this article results of measurements of infrared parametric fluorescence in segmented KTP channel waveguides are presented, showing the dependence of optical parametric oscillator tuning curves and fluorescence conversion efficiency (parametric gain) on segmentation duty-cycle.
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    Quasi-phase-matched parametric interactions in proton-exchanged lithium niobate waveguides
    (Optical Society of America (OSA), 1997) El Hadi, K.; Baldi P.; Aschieri, P.; De Micheli, M.P.; Ostrowsky, D.B.; Laurell F.; Department of Physics; Sundheimer, Michael; Faculty Member; Department of Physics; College of Sciences; N/A
    We present a review of parametric fluorescence with bulk and guided geometries in quasi-phase matched lithium niobate. Whereas bulk experiments have yielded results close to theoretical predictions, waveguided versions have shown strongly reduced efficiencies. Attributing the observed conversion efficiency reductions to a loss of the material nonlinearity, to a destruction of the inverted domains during the waveguide fabrication, or to both, we carefully studied the influence of the proton-exchange process on the nonlinear and structural properties of the periodically poled lithium niobate. We found that an annealed proton-exchange process can essentially conserve the nonlinearity but will erase the periodic domain structure. This erasure can be avoided by use of a highly diluted proton-exchange melt. This direct proton-exchange process perfectly preserves all the nonlinear optical and structural properties of periodically poled LiNbO3.
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    Modeling and experimental observation of parametric processes in segmented KTiOPO4 channel waveguides
    (American Institute of Physics (AIP) Publishing, 1999) Aschieri, P.; Baldi, P.; Bierlein, J.; Department of Physics; Sundheimer, Michael; Faculty Member; Department of Physics; College of Sciences
    This letter presents a modeling technique for quasiphase-matched parametric processes in segmented channel waveguides and the results of measurements of infrared parametric fluorescence in segmented KTiOPO4 channel waveguides. We demonstrate both theoretically and experimentally a strong dependence of optical parametric oscillator tuning curves and parametric conversion efficiency (parametric gain) on the segmentation duty cycle. We show that the optimum conversion efficiency for parametric interactions in segmented waveguides is obtained for duty cycles greater than 50%. Our results validate the use of an effective continuous waveguide model for segmented channel waveguide calculations over a wide range of wavelengths and duty cycles. (C) 1999 American Institute of Physics. [S0003-6951(99)02812-0].
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    Widely tunable continuous-wave solid-state red laser source using periodically-poled lithium niobate
    (Society of Photo-optical Instrumentation Engineers (SPIE), 1999) Department of Physics; Sundheimer, Michael; Sennaroğlu, Alphan; Faculty Member; Faculty Member; Department of Physics; College of Sciences; N/A; 23851
    In this work we have generated widely-tunable continuous-wave (CW) red light by second-harmonic generation (SHG) of the output of a Cr4+:forsterite laser, tunable from 1.206 to 1.320 mu m, using quasi-phasermatching (QPM) in periodically-poled lithium niobate (PPLN). For a given grating period in the PPLN, a combination of Cr4+:forsterite pump wavelength tuning and PPLN temperature tuning up to 200 degrees C provided continuous SHG tuning over a wavelength range of approximately 14 nm in the red. By translating the PPLN crystal to other periods, we have demonstrated SHG over the entire tuning range of the pump laser, yielding tunable CW output from 603 to 660 mu with maximum output powers of approximately 5 mW for a typical Cr4+:forsterite pump power of 500 mW.