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Proceedings Paper

Diode-side-pumped monolithic Nd:YAG slab laser
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Paper Abstract

Compact, high-efficient, side-pumped monolithic Nd:YAG slab laser is presented. Designed active crystal shape ensures four internal reflections of generated laser radiation forming a ring resonator with high gain. A horizontal projection of the active medium form was a isosceles trapezoid with 18.6 mm long base, and 5 mm height. The angels between long base and legs are 87 deg. The thickness of the slab was 4 mm. Both base-sides and one leg-side was high reflective for lasing radiation. Second leg-side was partially reflective for lasing radiation and serves as an output coupler. The longer base-side was highly transparent for pumping radiation. The opposite base-side was highly reflecting for pump. To increase the pump absorption efficiency Nd-doping concentration was 1.4 % Nd/Y. As a pump source, single-bar quasi-cw fast-axis collimated laser diode JOLD-180-QPFN (Jenoptik) with peak power 180 W at 808 nm and output beam 10 0.9 mm without any further optics was used for slab side-pumping. The pumping pulses with repetition rate 5 Hz were 250 μs long (maximum pump energy 39 mJ). The Nd:YAG laser was operated at 1.06 µm. Two external mirrors (one totally reflecting, second with reflectivity 80 % at 1.06 μm) were used to form the oscillator. The laser was tested in the free-running regime. The maximum laser output energy reached was 5.9 mJ which corresponds to optical-to-optical efficiency of 15 %. The laser slope efficiency in respect to laser diode output was 20 %. The divergence of multimode output beam was 7 × 2.5mrad.

Paper Details

Date Published: 11 May 2017
PDF: 7 pages
Proc. SPIE 10238, High-Power, High-Energy, and High-Intensity Laser Technology III, 1023815 (11 May 2017); doi: 10.1117/12.2265705
Show Author Affiliations
Jan Šulc, Czech Technical Univ. in Prague (Czech Republic)
Michal Jelínek Jr., Czech Technical Univ. in Prague (Czech Republic)
Václav Kubeček, Czech Technical Univ. in Prague (Czech Republic)
Helena Jelínková, Czech Technical Univ. in Prague (Czech Republic)
Karel Nejezchleb, Crytur, Ltd. (Czech Republic)
Václav Škoda, Crytur, Ltd. (Czech Republic)

Published in SPIE Proceedings Vol. 10238:
High-Power, High-Energy, and High-Intensity Laser Technology III
Joachim Hein, Editor(s)

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