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Proceedings Paper

Continuous-wave seeded mid-IR parametric system pumped by the high-average-power picosecond Yb:YAG thin-disk laser
Author(s): Ondřej Novák; Martin Smrž; Taisuke Miura; Hana Turčičová; Akira Endo; Tomáš Mocek
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Paper Abstract

Mid-IR wavelength range offers variety of interesting applications. Down-conversion in the optical parametric devices is promising to generate high average power mid-IR beam due to inherently low thermal load of the nonlinear crystals if a powerful and high quality pump beam is available. We developed 100 kHz pump laser of 100-W level average power. The stretched pulses of Yb-fiber laser oscillator at 1030 nm wavelength are injected into the regenerative amplifier with an Yb:YAG thin-disk. Diode pumping at zero phonon line at wavelength of 969 nm significantly reduces its thermal load and increases conversion efficiency and stability. We obtained the beam with power of 80 W and 2 ps compressed pulsewidth.

We are developing a watt level mid-IR picosecond light source pumped by a beam of the thin disk regenerative amplifier. Part of the beam pumps PPLN, which is seeded by a continuous wave laser diode at 1.94 μm to decrease the generation threshold and determine the amplified spectrum. The 3 W pumping gave output of 30 mW, which is by up to two orders higher compared to unseeded operation. The gain of about 107 was achieved in the PPLN in the temporal window of the pump pulse. The spectrum and beam of the generated idler pulses in the mid-IR was measured. We obtained an amplified signal from the second stage with the KTP crystal. We expect watt level mid-IR output for initial 50-W pumping. The generation of longer wavelengths is discussed.

Paper Details

Date Published: 18 May 2015
PDF: 10 pages
Proc. SPIE 9503, Nonlinear Optics and Applications IX, 95030W (18 May 2015); doi: 10.1117/12.2178747
Show Author Affiliations
Ondřej Novák, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Martin Smrž, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Taisuke Miura, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Hana Turčičová, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Akira Endo, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
Tomáš Mocek, Institute of Physics of the ASCR, v.v.i. (Czech Republic)

Published in SPIE Proceedings Vol. 9503:
Nonlinear Optics and Applications IX
Mario Bertolotti; Joseph W. Haus; Alexei M. Zheltikov, Editor(s)

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