Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios

Carlota Canalias; Andrius Zukauskas; Staffan Tjörnhamman; Anne-Lise Viotti; Valdas Pasiskevicius; Fredrik Laurell

doi:10.1117/12.2288174

15 February 2018 Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios

Carlota Canalias, Andrius Zukauskas, Staffan Tjörnhamman, Anne-Lise Viotti, Valdas Pasiskevicius, Fredrik Laurell

Author Affiliations +

Proceedings Volume 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII; 105160W (2018) https://doi.org/10.1117/12.2288174
Event: SPIE LASE, 2018, San Francisco, California, United States

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.

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Carlota Canalias, Andrius Zukauskas, Staffan Tjörnhamman, Anne-Lise Viotti, Valdas Pasiskevicius, and Fredrik Laurell "Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios", Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105160W (15 February 2018); https://doi.org/10.1117/12.2288174

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KEYWORDS

Crystals

Optical parametric oscillators

Ferroelectric materials

Absorption

Laser crystals

Energy efficiency

Second-harmonic generation

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