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Proceedings Paper

Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios
Author(s): Carlota Canalias; Andrius Zukauskas; Staffan Tjörnhamman; Anne-Lise Viotti; Valdas Pasiskevicius; Fredrik Laurell
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Paper Abstract

Since the early 1990’s, a substantial effort has been devoted to the development of quasi-phased-matched (QPM) nonlinear devices, not only in ferroelectric oxides like LiNbO3, LiTaO3 and KTiOPO4 (KTP), but also in semiconductors as GaAs, and GaP. The technology to implement QPM structures in ferroelectric oxides has by now matured enough to satisfy the most basic frequency-conversion schemes without substantial modification of the poling procedures. Here, we present a qualitative leap in periodic poling techniques that allows us to demonstrate devices and frequency conversion schemes that were deemed unfeasible just a few years ago. Thanks to our short-pulse poling and coercive-field engineering techniques, we are able to demonstrate large aperture (5 mm) periodically poled Rb-doped KTP devices with a highly-uniform conversion efficiency over the whole aperture. These devices allow parametric conversion with energies larger than 60 mJ. Moreover, by employing our coercive-field engineering technique we fabricate highlyefficient sub-µm periodically poled devices, with periodicities as short as 500 nm, uniform over 1 mm-thick crystals, which allow us to realize mirrorless optical parametric oscillators with counter-propagating signal and idler waves. These novel devices present unique spectral and tuning properties, superior to those of conventional OPOs. Furthermore, our techniques are compatible with KTA, a KTP isomorph with extended transparency in the mid-IR range. We demonstrate that our highly-efficient PPKTA is superior both for mid-IR and for green light generation – as a result of improved transmission properties in the visible range. Our KTP-isomorph poling techniques leading to highly-efficient QPM devices will be presented. Their optical performance and attractive damage thresholds will be discussed.

Paper Details

Date Published: 15 February 2018
PDF: 15 pages
Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105160W (15 February 2018);
Show Author Affiliations
Carlota Canalias, KTH Royal Institute of Technology (Sweden)
Tailored Photons AB (Sweden)
Andrius Zukauskas, KTH Royal Institute of Technology (Sweden)
Tailored Photons AB (Sweden)
Staffan Tjörnhamman, KTH Royal Institute of Technology (Sweden)
Anne-Lise Viotti, KTH Royal Institute of Technology (Sweden)
Valdas Pasiskevicius, KTH Royal Institute of Technology (Sweden)
Tailored Photons AB (Sweden)
Fredrik Laurell, KTH Royal Institute of Technology (Sweden)
Tailored Photons AB (Sweden)

Published in SPIE Proceedings Vol. 10516:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII
Konstantin L. Vodopyanov; Kenneth L. Schepler, Editor(s)

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