Generation of the fifth Harmonic of a neodymium laser in ADP

Ildar Begishev, Laboratory for Laser Energetics, University of Rochester 

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Abstract

High-energy deep ultraviolet (UV) sources are required for high-density plasma diagnostics. The fifth-harmonic generation of large-aperture neodymium lasers in ammonium dihydrogen phosphate (ADP) can significantly increase UV energies due to the availability of large ADP crystals. Noncritical phase matching in ADP for (w + 4w) was achieved by cooling a 65 x 65-mm crystal in a two-chamber cryostat to 200 K. The crystal chamber used helium as the thermally conductive medium between the crystal and the crystal chamber, which was surrounded by a high-vacuum chamber with a liquid nitrogen reservoir. A temperature variation of 0.2 K across the crystal aperture was obtained. The total conversion efficiency from the fundamental to the fifth harmonic at 211 nm was 26%.

About the speaker

Ildar A. Begishev received the M.S. degree in Engineering Physics from the Tashkent State Technical University, Uzbekistan (former Soviet Union), in 1981 and the Ph.D. degree in quantum electronics from the Arivof Institute of Electronics, Tashkent, Uzbekistan in 1991, where he was working on harmonics and parametric waves generations in radiation of large solid state lasers. After investigation chirped pulse amplification and its applications in 1999-2001 at Max Born Institute (Berlin, Germany) he joined Laboratory for Laser Energetics of University of Rochester (USA). His primary research interests are nonlinear optics (harmonics, parametric processes), compressed pulses and solid state lasers.

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