| 1. |
- Masiello, Fabio, et al.
(författare)
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Investigation by coherent X-ray section topography of ferroelectric domain behaviour as a function of temperature in periodically poled Rb:KTP
- 2011
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Ingår i: Journal of applied crystallography. - 0021-8898 .- 1600-5767. ; 44, s. 462-466
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Tidskriftsartikel (refereegranskat)abstract
- The behaviour of ferroelectric domains at high temperatures near the Curie temperature in a periodically poled rubidium-doped potassium titanyl phosphate crystal (Rb:KTP) has been studied by Bragg-Fresnel X-ray diffraction imaging in situ using a compact coherence-preserving furnace. The development and partial disappearance of the inverted domain structure as the temperature increases has been successfully modelled, and is explained by invoking a built-in electric field produced under heating in a low vacuum by out-diffusion of atoms from the sample.
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| 2. |
- Strömqvist, Gustav, et al.
(författare)
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Coherent phase-modulation transfer in counterpropagating parametric down-conversion
- 2011
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 84:2
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Tidskriftsartikel (refereegranskat)abstract
- Distributed positive feedback established by a counterpropagating three-wave mixing process in a submicrometer structured second-order nonlinear medium leads to mirrorless parametric oscillation with unusual spectral properties. In this work, we demonstrate experimentally and theoretically that the phase modulation of the pump is coherently transferred to the co-propagating parametric wave, while the counterpropagating wave retains a narrow bandwidth and high coherence. The main mechanisms responsible for these properties are the maximized convective separation between the counterpropagating waves and the associated phase-locking between the pump and the co-propagating parametric wave. This suggests that mirrorless optical parametric oscillators can be pumped with incoherent light and still generate highly coherent backward-propagating radiation.
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| 3. |
- Strömqvist, Gustav, et al.
(författare)
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Self-established noncollinear oscillation and angular tuning in a quasi-phase-matched mirrorless optical parametric oscillator
- 2011
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 98:5, s. 051108-
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally demonstrate self-established noncollinear interactions in a quasi-phase-matched mirrorless optical parametric oscillator using a periodically-poled KTiOPO4 crystal with submicrometer periodicity. It is shown that the oscillation is established in a very specific geometric configuration where the two possible solutions of the energy and momentum conservation conditions become spatially degenerate and contribute coherently to the gain. In this configuration, the signal and the idler remain mutually counter-propagating. The tuning capabilities of a noncollinear mirrorless optical parametric oscillator are investigated. (c) 2011 American Institute of Physics.
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| 4. |
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| 5. |
- Zukauskas, Andrius, 1983-, et al.
(författare)
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Fabrication of submicrometer quasi-phase-matched devices in KTP and RKTP [Invited]
- 2011
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Ingår i: Optical Materials Express. - : Optical Society of America. - 2159-3930. ; 1:7, s. 1319-1325
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Tidskriftsartikel (refereegranskat)abstract
- We review the techniques used for fabrication of bulk submicrometer ferroelectric domain gratings in KTiOPO4 (KTP) and demonstrate that bulk Rb-doped KTiOPO4 (RKTP) is an excellent candidate for implementation of dense domain gratings. Compared to KTP, RKTP presents predominant domain propagation along the polar c-direction, substantially reduced lateral domain broadening, and higher poling yield. As a result we obtain homogeneous sub-μm periodic poling of RKTP with a period of 690 nm in 1 mm thick samples.
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