Efficient generation of 509 nm light by sum-frequency mixing between two tapered diode lasers

M. Tawfieqa, O.B. Jensena, A.K. Hansena, B. Sumpfb, K. Paschkeb, P.E. Andersena

Published in:

Opt. Commun., vol. 339, pp. 137-140 (2015).

Copyright © 2015 Elsevier Ltd. All rights reserved.. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the Elsevier Ltd.

Abstract:

We demonstrate a concept for visible laser sources based on sum-frequency generation of beam combined tapered diode lasers. In this specific case, a 1.7 W sum-frequency generated green laser at 509 nm is obtained, by frequency adding of 6.17 W from a 978 nm tapered diode laser with 8.06 W from a 1063 nm tapered diode laser, inside a periodically poled MgO doped lithium niobate crystal. This corresponds to an optical to optical conversion efficiency of 12.1%. As an example of potential applications, the generated nearly diffraction-limited green light is used for pumping a Ti:sapphire laser,thus demonstrating good beam quality and power stability. The maximum output powers achieved when pumping the Ti:sapphire laser are 226 mW (CW) and 185 mW (mode-locked) at 1.7 W green pump power. The optical spectrum emitted by the mode-locked Ti:sapphire laser shows a spectral width of about 54 nm (FWHM), indicating less than 20 fs pulse width.

a DTU Fotonik,Department of Photonics Engineering, Technical University of Denmark,Frederiksborgvej 399, 4000 Roskilde, Denmark
b Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany

Keywords:

Diode lasers, Sum frequency generation, Tapered lasers, Visible lasers.