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Tandem OPO systems for mid-infrared generation using quasi phase-matching and volume Bragg gratings
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Swedish Defence Research Agency, Linköping, Sweden.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0002-2508-391X
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2007 (English)In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE - International Society for Optical Engineering, 2007, Vol. 6738, 73805-73805 p.Conference paper (Refereed)
Abstract [en]

Efficient laser sources in the 3 - 5 μm wavelength range are needed for directed infrared countermeasures, but also have applications in remote sensing, medicine and spectroscopy. We present results and discuss the possibilities of a tandem optical parametric oscillator (OPO) scheme for converting the radiation from a 1.06 μm Nd3+-laser to the mid-infrared. Our setup uses type I quasi phase-matched (QPM) crystals in a near degenerate OPO to generate 2.13 μm radiation. The QPM crystal provides higher nonlinearity and longer interaction lengths, because walk-off is avoided, compared to conventional bulk crystals. This is an advantage especially in low pulse energy applications. To make the 2.13 μm radiation usable for pumping a second OPO a volume Bragg grating is used as a cavity mirror to limit the bandwidth, which in a conventional QPM OPO at degeneracy can be several hundred nanometers. The acceptance bandwidth for efficient OPO operation of a 14 mm long ZnGeP2 (ZGP) crystal is approximately 5 nm, which makes the need for bandwidth limiting clear. The majority of the signal energy from a periodically poled KTiOPO4 (PP KTP) OPO with a volume Bragg grating output coupler was found to be in a single longitudinal mode, whereas the idler bandwidth was measured to 19 GHz (FWHM). A volume Bragg grating resonant near 2124 nm was chosen so that the signal and idler were separated by 9 nm. This OPO output has been used as a pump source for a conventional ZGP OPO demonstrating efficient conversion and providing broadband tunable output in the mid-infrared.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2007. Vol. 6738, 73805-73805 p.
Series
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-181751DOI: 10.1117/12.737229ISI: 000252958400003ScopusID: 2-s2.0-42149105080OAI: oai:DiVA.org:kth-181751DiVA: diva2:899979
Conference
SPIE Europe Optics & Photonics in Security and Defence (ESD07), Technologies for Optical Countermeasures IV, Florence, Italy 17-20 September, 2007.
Note

QC 20160222

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-05-30Bibliographically approved

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Henriksson, MarkusPasiskevicius, ValdasLaurell, Fredrik
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