Mr. Flavius Marian Voicu Profile

Flavius Marian Voicu

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Proceedings Article | 1 May 2014 Paper

Laser emission from diode-pumped Nd:YAG cladding waveguides obtained by direct writing with a femtosecond-laser beam

Gabriela Salamu, Flavius Voicu, Florin Jipa, Marian Zamfirescu, Traian Dascalu, Nicolaie Pavel

Proceedings Volume 9135, 91351F (2014) https://doi.org/10.1117/12.2052250

KEYWORDS: Waveguides, Nd:YAG lasers, Semiconductor lasers, Ceramics, Cladding, Crystals, Refractive index, Energy efficiency, Laser crystals, Laser energy

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Cladding waveguides have been realized in Nd:YAG by direct writing with a femtosecond-laser beam. A classical method that inscribes many tracks around the waveguide circumference with step-by-step translations of the laser medium, and a new technique in which the laser medium is moved on a helical trajectory and that delivers waveguides with well-defined walls were employed. Laser emission on the 1.06 μm ⁴F₃/2→⁴I_11/2 transition and at 1.3 μm on the ⁴F_3/2→4I_13/2 line was obtained under the pump with a fiber-coupled diode laser. Thus, laser pulses at 1.06 μm with energy of 1.3 mJ for the pump at 807 nm with pulses of 12.5-mJ energy were recorded from a circular waveguide of 100-μm diameter that was inscribed in a 5-mm long, 0.7-at.% Nd:YAG single crystal by the classical translation technique. A similar waveguide that was realized in a 5-mm long, 1.1-at.% Nd:YAG ceramic increased the 1.06-μm laser pulse energy to 2.15 mJ for the pump pulses of 13.1-mJ energy. Furthermore, a circular waveguide of 100-μm diameter that was inscribed in the Nd:YAG ceramic by the helical-movement method yielded pulses at 1.06 μm with increased maximum energy of 3.2 mJ; the overall optical-to-optical efficiency was 0.24, and the laser operated with a slope efficiency of 0.29. The same device outputted laser pulses at 1.3 μm with energy of 1.15 mJ.

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