Browsing by Subject "Lithium niobate"
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Item Open Access Nanosecond sum-frequency generating optical parametric oscillator using simultaneous phase matching(Optical Society of American (OSA), 2005) Figen, Z.G.; Aytür O.We report a nanosecond sum-frequency generating optical parametric oscillator based on a single KTiOAsO4 crystal that is simultaneously phase matched for optical parametric generation and sum-frequency generation. Pumped at a wavelength of 1064 nm by a Q-switched Nd:YAG laser, this device produces 10.4-ns-long 8.3 mJ red pulses at a wavelength of 627 nm with 21% energy conversion efficiency. This device provides a simple and efficient method for converting high energy Nd:YAG lasers to a red wavelength. © 2005 Optical Society of America.Item Open Access A self-doubling optical parametric oscillator based on aperiodically-poled lithium niobate(IEEE, 2001) Kartaloǧlu, Tolga; Figen, Ziya Gürkan; Aytür, OrhanA self-doubling optical parametric oscillator (SDOPO) having one-dimensional aperiodic grating structure based on a LiNbO3 crystal was constructed. The structure was designed to quasi-phase-match both second harmonic generation (SHG) and optical parametric oscillation (OPO) processes. The grating structure contained in the LiNbO3 crystal was based on the construction of a function by summing up two cosine functions with arbitrary phase and amplitude.Item Open Access Simultaneous phase matching of optical parametric oscillation and second-harmonic generation in aperiodically poled lithium niobate(Optical Society of American (OSA), 2003) Kartaloğlu, T.; Figen, Z. G.; Aytür, O.We report a simple ad hoc method for designing an aperiodic grating structure to quasi-phase match two arbitrary second-order nonlinear processes simultaneously within the same electric-field-poled crystal. This method also allows the relative strength of the two processes to be adjusted freely, thereby enabling maximization of the overall conversion efficiency. We also report an experiment that is based on an aperiodically poled lithium niobate crystal that was designed by use of our method. In this crystal, parametric oscillation and second-harmonic generation are simultaneously phase matched for upconversion of a femtosecond Ti:sapphire laser to 570 nm. This self-doubling optical parametric oscillator provides an experimental verification of our design method. © 2003 Optical Society of America.Item Open Access Ti-indiffused waveguide polarizers on lithium niobate for fiber optic gyroscope(OSA, 2018) Kanlı, Yasemin; Öztekin, Evren; Dönertaş, Seval; Gökkavas, Mutlu; Özbay, EkmelWe report our results on polarizing waveguides fabricated by Ti indiffusion technique on x-cut y-propagating LiNbO3. Polarizing Ti indiffused waveguides with polarization extinction coefficient (PER) higher than 47 dB at their outputs, operating at 1550 nm wavelength were demonstrated.Item Open Access Tunable ring-coupled Mach-Zehnder interferometer based on lithium niobate(Taylor and Francis, 2014) Solmaz, M. E.The fabrication and characterization are reported of a Fano resonance-based electro-optically tunable ring resonator-coupled Mach-Zehnder interferometer device based on a chalcogenide-lithium niobate hybrid waveguide system. The experiments reveal inherent asymmetric lineshapes that can be flipped to a near symmetrical resonance by applying a dc voltage of ~10 V across the electrode at the MZI non-resonator arm. Further increase in voltage yields the reverse of initial asymmetry. The optical filter-based transfer-matrix model easily explains the experimental data and indicates ways to further enhance the usability of such architecture. © 2014 Taylor and Francis.Item Open Access Ultra-miniature dual-band antenna based on subwavelength resonators on LiNbO3 substrate(IET, 2018) Serebryannikov, A. E.; Gokkavas, M.; Gundogdu, F. T.; Vandenbosch, G. A. E.; Vasylchenko, A.; Özbay, EkmelThe common effect of subwavelength resonators and a high-permittivity lithium niobate substrate is used for deep-subwavelength miniaturization of a dual-band S/C-band monopole antenna. The resulting size is just about 1/18th of a wavelength for the lower band.