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Proceedings Paper

Investigations of laser induced damage in KTiOPO4 and Rb:KTiOPO4 at 1 μm and 2 μm
Author(s): Riaan S. Coetzee; Nicky Thilmann; Andrius Zukauskas; Carlota Canalias; Valdas Pasiskevicius
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Paper Abstract

One of the most practical means of generating tunable mid-infrared output is by using cascaded parametric downconversion from 1 μm, where efficient and reliable high-energy nanosecond lasers are well established. The overall efficiency of the cascade relies heavily on the efficiency of the first down-conversion stage where it is beneficial to employ quasi-phase matched crystals such as periodically-poled Rb:KTiOPO4 (PPRKTP). Ultimately, the pulse energy at 2 μm and the optimum design of the first cascade will depend on the maximum intensity which could be safely applied to these crystals and therefore these schemes mandate investigation of nanosecond laser-induced damage threshold in KTiOPO4 (KTP) and Rb:KTiOPO4 (RKTP) at 1.064 μm and 2 μm. In the context of high-energy systems, where the beams are at most loosely focused, the limiting energy fluence will be determined by the laser induced damage threshold (LIDT) of the bare surface. Therefore the LIDT of the bare surface is the lowest LIDT which has to be taken into account in design of robust 2 μm parametric systems. We report surface LIDT measurements in KTP and RKTP with nanosecond pulses at 1.064 μm and 2.1 μm. We find that the reported LIDT for the bulk is far higher than that of the surface and therefore is unsuitable as a guide for the 2 μm parametric system designs. LIDT values for KTP and RKTP with nanosecond pulses at 2 μm have not been reported so far to the best of our knowledge.

Paper Details

Date Published: 14 July 2015
PDF: 8 pages
Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 95320B (14 July 2015); doi: 10.1117/12.2187046
Show Author Affiliations
Riaan S. Coetzee, KTH Royal Institute of Technology (Sweden)
Nicky Thilmann, KTH Royal Institute of Technology (Sweden)
Andrius Zukauskas, KTH Royal Institute of Technology (Sweden)
Carlota Canalias, KTH Royal Institute of Technology (Sweden)
Valdas Pasiskevicius, KTH Royal Institute of Technology (Sweden)


Published in SPIE Proceedings Vol. 9532:
Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph; Meiping Zhu, Editor(s)

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