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Proceedings Paper

Ho3+:LLF MOPA pumped RISTRA ZGP OPO at 3-5 µm
Author(s): Georg Stoeppler; Martin Schellhorn; Marc Eichhorn
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Paper Abstract

High pulse energies in the mid-IR with a comfortable tuning possibility are required in a number of areas, including remote sensing, medicine and counter measure applications. Frequency converters based on the crystal ZnGeP2 (ZGP) are widely used for generating tunable IR radiation in the 2.5 μm - 12 μm region. ZGP possesses high nonlinearity, however, due to its limited transparency range it requires pump wavelengths longer than 2 μm. A significant drawback of ZGP and of most other IR non-linear crystals is a low damage threshold of ~ 1 J/cm2 for nanosecond pulses. Therefore nanoseconds OPOs at pulse energies in the 10 mJ – 100 mJ range require large diameter pump beams to reduce the risk of optical damage to the crystal. We used the “Rotated-Image, Singly resonant, Twisted-RectAngle” (RISTRA) ring cavity concept to improve the beam quality of the OPO stage. A Tm3+ fiber laser pumped Ho3+:LuLiF4 (Ho3+:LLF) MOPA system was developed delivering > 100 mJ at 2053 nm in TEM00 operation at a repetition rate of 100 Hz. Using a RISTRA as a single OPO stage we demonstrated an overall OPO pulse energy of 23.8 mJ in the wavelength region 3 μm - 5 μm at a pump energy of about 45.6 mJ and a repetition rate of 100 Hz. The beam quality was measured to be M2 ~ 2.5.

Paper Details

Date Published: 12 March 2013
PDF: 7 pages
Proc. SPIE 8604, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII, 86040I (12 March 2013); doi: 10.1117/12.2004021
Show Author Affiliations
Georg Stoeppler, Institut Franco-Allemand de Recherches de Saint-Louis (France)
Martin Schellhorn, Institut Franco-Allemand de Recherches de Saint-Louis (France)
Marc Eichhorn, Institut Franco-Allemand de Recherches de Saint-Louis (France)


Published in SPIE Proceedings Vol. 8604:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII
Konstantin L. Vodopyanov, Editor(s)

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