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We report the first experimental observation of discrete quadratic interface solitons existing at the edge of a PPLN waveguide array. Both in-phase and staggered discrete surface solitons were observed.
We have generated squeezed vacuum in optical telecommunication band by a single-pass parametric amplification in periodically poled lithium niobate. The measured noise reduction was 3.1 dB below the shot-noise level.
Lithium niobate crystals doped with hafnium exhibit a significant suppression of the photorefractive effect and represent a promising substrate for wavelength converter devices. In this work we present a systematic investigation of their physical properties.
A fully integrated self-referenced Er-fiber frequency-comb system without the use of highly nonlinear or microstructured fiber is demonstrated. We use a single PPLN-waveguide for both spectral broadening and 2f-to-3f CEO-phase detection.
A planar-waveguide quasi-phase matched second-harmonic generation device, which consists of a Y-cut periodically poled MgO-doped LiNbO3 core and SiO2 claddings, provides 1-W green light with 30-% conversion efficiency at room temperature.
Second-order nonlinear-optical coefficients of undoped and MgO-doped near-stoichiometric LiNbO3 are measured at the fundamental wavelength of 1.31 mum. The values are found to be nearly same with those of congruent LiNbO3 within the experimental accuracy.
Active mode-locking of a near degenerate (~1064 nm) doubly resonant periodically poled LiNbO3 OPO pumped at 532 nm is reported. Pulse durations as short as 700 ps are observed.
In this study, 1-mum-dot domain by resist-assisted electron beam writing and 100-nm-wide line domain by focused ion beam domain patterning techniques have been demonstrated in LiNbO3 and LiTaO3 crystals thicker than tens of mum.
Blue light-induced infrared absorption is investigated in bulk and periodically poled KTiOPO4, MgO:stoichiometric-LiNbO3, MgO:stoichiometric-LiTaO3, KNbO3. KNbO3 and MgO:stoichiometric-LiNbO3 show the lowest susceptibility to the induced absorption. Periodic poling increases the susceptibility in KTiOPO4 and MgO:stoichiometric-LiTaO3.
An optically integrated frequency-comb-system based on a passively-mode locked, fCEO-locked Er:soft-glass-fiber-laser and a PPLN-waveguide phase-sensor is demonstrated. The oscillator emits pulses with 61 nm spectral bandwidth and 170 MHz repetition frequency.
We report on efficient nonlinear frequency doubling of broadband near-infrared pulses from a femtosecond fiber laser into narrowband visible radiation tunable from green to red with average power levels up to 9.5 mW.
An intense comb-shaped phonon-polariton Raman spectra were obtained from a two-dimensional nonlinear chi(2) photonic crystal - a hexagonally poled LiTaO3 crystal. The work presents a novel method to study the inelastic scattering in a nonlinear medium.
An efficient 532 nm-pumped pulsed OPO that could be operated at room temperature using a PPMgSLT crystal is reported. >1.0 W total output for a 1.6 W input (power conversion of 62.5%) was achieved.
The highly efficient 2-mum Ho:YLF laser has been demonstrated at room temperature. For 35 W pumping power, 19 W output power is obtained at the TEM00 mode. The slope and optical-to-optical efficiencies are 65% and 55%, respectively.
Photorefractive properties of lithium niobate and tantalate are studied in infrared using whispering gallery mode resonators. Unusual dynamics in the resonator spectra with applied light is observed.
We demonstrated 80 Gb/s optical differential quadrature-shift-keying modulation, by using a single-chip integrated LiNbO3 modulator with two sub Mach-Zehnder interferometers, where 40 Gb/s in-phase and quadrature data were, simultaneously, fed to the modulator.
We present a LiNbO3 disk resonator with a SiO2 cladding layer and proximate electrodes fabricated on a flexible substrate. A tunable optical filter based on whispering gallery modes is demonstrated using the resonator.
Intensity dependence of OPO performance was measured to investigate uniformity in thick QPM PPMgSLT fabricated by use of single- and multi-pulse methods. A large effective aperture (fluctuation<10%) of 1.4times1.3 mm2 may be obtained in the both types of devices.
19 mW of continuous-wave ultraviolet radiation at 320 nm with ~9% optical-to-optical efficiency is demonstrated by intracavity frequency-doubling of a Pr:LiYF4 laser, excited by an optically pumped semiconductor laser.
Non-volatile electroholographic diffraction gratings were fabricated by periodically modulating the composition of KLTN crystals. The gratings are manifested as periodic variations of the static dielectric constant which are electrically induced into birefringence gratings.
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