Investigations of laser induced damage in KTiOPO4 and Rb:KTiOPO4 at 1 μm and 2 μm

Riaan S. Coetzee; Nicky Thilmann; Andrius Zukauskas; Carlota Canalias; Valdas Pasiskevicius

doi:10.1117/12.2187046

14 July 2015 Investigations of laser induced damage in KTiOPO₄ and Rb:KTiOPO₄ at 1 μm and 2 μm

Riaan S. Coetzee, Nicky Thilmann, Andrius Zukauskas, Carlota Canalias, Valdas Pasiskevicius

Proceedings Volume 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers; 95320B (2015) https://doi.org/10.1117/12.2187046
Event: Pacific Rim Laser Damage, 2015, Jiading, Shanghai, China

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.

Citation Download Citation

Riaan S. Coetzee, Nicky Thilmann, Andrius Zukauskas, Carlota Canalias, and Valdas Pasiskevicius "Investigations of laser induced damage in KTiOPO₄ and Rb:KTiOPO₄ at 1 μm and 2 μm", Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 95320B (14 July 2015); https://doi.org/10.1117/12.2187046

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
8 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Ferroelectric materials

Crystals

Laser induced damage

Laser damage threshold

Antireflective coatings

Laser crystals

Absorption

Show All Keywords

Keywords/Phrases

Search In:

Publication Years