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Investigations of Laser Induced Damage in KTiOPO4 and Rb:KTiOPO4 at 1 mu m and 2 mu m
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0001-8764-3372
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0003-2070-9167
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2015 (English)In: PACIFIC RIM LASER DAMAGE 2015: OPTICAL MATERIALS FOR HIGH-POWER LASERS, 2015, Vol. 9532, 95320BConference paper, Published paper (Refereed)
Abstract [en]

One of the most practical means of generating tunable mid-infrared output is by using cascaded parametric down-conversion from 1 mu m, 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 mu m 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 mu m and 2 mu m. 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 mu m parametric systems. We report surface LIDT measurements in KTP and RKTP with nanosecond pulses at 1.064 mu m and 2.1 mu m. 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 mu m parametric system designs. LIDT values for KTP and RKTP with nanosecond pulses at 2 mu m have not been reported so far to the best of our knowledge.

Place, publisher, year, edition, pages
2015. Vol. 9532, 95320B
Series
Proceedings of SPIE, ISSN 0277-786X
Keyword [en]
laser damage, KTP, RKTP, mid-infrared
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-173297DOI: 10.1117/12.2187046ISI: 000359672600006ISBN: 978-1-62841-697-8 (print)OAI: oai:DiVA.org:kth-173297DiVA: diva2:852510
Conference
4th Pacific Rim Laser Damage Symposium on Optical Materials for High-Power Lasers, MAY 17-20, 2015, Jiading, PEOPLES R CHINA
Note

QC 20150909

Available from: 2015-09-09 Created: 2015-09-09 Last updated: 2015-09-09Bibliographically approved

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Thilmann, NickyCanalias, CarlotaPasiskevicius, Valdas

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