Wavelength tunability of laser based on Yb-doped YGAG ceramics

Jan Šulc; Helena Jelínková; Venkatesan Jambunathan; Taisuke Miura; Akira Endo; Antonio Lucianetti; Tomáš Mocek

doi:10.1117/12.2077494

20 February 2015 Wavelength tunability of laser based on Yb-doped YGAG ceramics

Jan Šulc, Helena Jelínková, Venkatesan Jambunathan, Taisuke Miura, Akira Endo, Antonio Lucianetti, Tomáš Mocek

Proceedings Volume 9342, Solid State Lasers XXIV: Technology and Devices; 93421T (2015) https://doi.org/10.1117/12.2077494
Event: SPIE LASE, 2015, San Francisco, California, United States

Abstract

The wavelength tunability of diode pumped laser based on Yb-doped mixed garnet Y₃Ga₂Al₃O₁₂ (Yb:YGAG) ceramics was investigated. The tested Yb:YGAG sample (10% Yb/Y) was in the form of 2mm thick plane-parallel face-polished plate (without AR coatings). A fiber (core diameter 100 μm, NA= 0.22) coupled laser diode (LIMO, LIMO35-F100-DL980-FG-E) with emission at wavelength 969 nm, was used for longitudinal Yb:YGAG pumping. The laser diode was operating in the pulsed regime (2 ms pulse length, 10 Hz repetition rate). The duty-cycle 2% ensured a low thermal load even under the maximum diode pumping power amplitude 20W (ceramics sample was only air-cooled). The 145mm long semi-hemispherical laser resonator consisted of a flat pumping mirror (HR @ 1.01 − 1.09 μm, HT @ 0.97 μm) and curved (r = 150mm) output coupler with a reflectivity of ∼ 97% @ 1.01 − 1.09 μm. Wavelength tuning of the ytterbium laser was accomplished by using a birefringent filter (single 1.5mm thick quartz plate) placed inside the optical resonator at the Brewster angle between the output coupler and the laser active medium. The laser was continuously tunable over ∼ 58nm (from 1022nm to 1080 nm) and the tuning band was mostly limited by the free spectral range of used birefringent filter. The maximum output power amplitude 3W was obtained at wavelength 1046nm for absorbed pump power amplitude 10.6W. The laser slope efficiency was 34%.

Citation Download Citation

Jan Šulc, Helena Jelínková, Venkatesan Jambunathan, Taisuke Miura, Akira Endo, Antonio Lucianetti, and Tomáš Mocek "Wavelength tunability of laser based on Yb-doped YGAG ceramics", Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 93421T (20 February 2015); https://doi.org/10.1117/12.2077494

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