Spectroscopy and CW first laser operation of Yb-doped Gd-3(Al0.5Ga0.5)(5)O-12 crystal

Year: 2017

Authors: Toci G., Pirri A., Ryba-Romanowsky W., Berkowski M., Vannini M.

Autors Affiliation: INO CNR, Ist Nazl Ott, CNR Natl Res Council, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, FI, Italy; IFAC CNR, Ist Fis Applicata Nello Carrara, CNR Natl Res Council, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, FI, Italy; Polish Acad Sci, Inst Low Temp & Struct Res, Okolna 2, PL-50422 Wroclaw, Poland; Polish Acad Sci, Inst Phys, Aleja Lotnikow 32-46, PL-02668 Warsaw, Poland.

Abstract: We present the spectroscopic characterization and laser operation of a 2%at. Yb doped Gd3(Al0.5Ga0.5)5O12 (Yb:GAGG) crystal, grown with the Czochralski method. We determined the absorption and the emission spectrum, the upper level lifetime, and the thermal conductivity. The internal disordered structure determines a significant broadening of the emission band (12.1 nm FWHM) with respect to the parent composition Yb:GGG (8 nm FWHM). The laser performances were evaluated on an end pumped cavity, using a CW semiconductor laser as the pump source. We obtained a maximum slope efficiency of 60.8% and an optical to optical efficiency of 46.0%, with a maximum output power of 4 W, limited only by the available pump power. The tuning range extends from 995 nm to 1050 nm. To our knowledge this is the first spectroscopic investigation and the first assessment of the laser performance of an Yb:GAGG crystal with this composition (i.e. Al/Ga balance = 0.5/0.5).

Journal/Review: OPTICAL MATERIALS EXPRESS

Volume: 7 (1)      Pages from: 170  to: 178

KeyWords: Absorption spectroscopy; Aluminum; Efficiency; Emission spectroscopy; Semiconductor lasers; Ytterbium, CW semiconductor lasers; Disordered structures; Emission spectrums; Maximum output power; Optical-to-optical efficiency; Slope efficiencies; Spectroscopic characterization; Spectroscopic investigations, Pumping (laser); Lasers, solid-state; Rare earth and transition metal lasers; Lasers, tunable; Laser materials
DOI: 10.1364/OME.7.000170

Citations: 18
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