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We present periodic poling of Rb-doped KTiOPO4. The crystal is used to obtain blue radiation at 398 nm with an efficiency of 30% and a peak intensity of 2 MW/cm2 without grey-tracking.
The paper discusses about the stimulated Raman scattering (SRS) in KTP crystals. SRS in KTP is governed by phonon-polariton scattering. It has been experimentally verified that when the pump propagates in the single-domain part at intensities 2-times above SRS threshold, about 40 % of the pump is converted into SRS. If the pump instead propagates through a periodically poled region in the same crystal...
In this work we show how the spectral properties of the pump are transferred to signal and idler in a mirrorless optical parametric oscillator and that the idler properties strongly depend on the grating vector.
We report on the progress in fabrication of sub-micrometer ferroelectric domain gratings in KTiOPO4. Periods as short as 565 nm have been created in the bulk of the crystal by electric-field poling.
The first demonstration of self-established noncollinear operation in the idler-counter-propagating mirrorless optical parametric oscillator is presented using periodically poled KTiOPO4 having 800 nm period. The noncollinear geometry is employed for enhanced output wavelength tuning.
Tunable continuous-wave single-frequency green radiation from 511.9 nm to 517.3 nm has been obtained by single-pass second harmonic generation in periodically poled KTiOPO4 (PPKTP). A maximum output power of 1.2 W was achieved.
Cerenkov phase-matching of second-order nonlinearities localized in the regions of ferroelectric domain walls in KTiOPO4 is used to realize a single-shot FROG arrangement for ultrashort pulse characterization, which can be used from visible to mid-infrared.
Frequency doubling is demonstrated in femtosecond-laser-created single-mode waveguides written in a periodically-poled potassium titanyl phosphate crystal. Conversion efficiencies of 0.22%/W (0.02%/W) were obtained for first (third) order phasematching at 980 nm (800 nm).
Efficient doubling of femtosecond pulses from a mode-locked Yb:KYW laser in periodically poled and aperiodically poled KTP is reported. Second-harmonic conversion efficiencies of up to 58% have been achieved and 354-fs pulses generated at 522 nm.
0.5 mm thick flux grown KTiOPO/sub 4/ has been poled with 800 nm domain period by employing electron-beam lithography and electric field poling. The structures can be used as an electrically amplitude adjustable Bragg reflector.
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