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Proceedings Paper

Continuous-wave and Q-switched laser operation of the disordered Yb:Ca3(NbGa)2−xGa3O12 crystal
Author(s): Junhai Liu; Wenjuan Han; Huaijin Zhang; Jiyang Wang; Valentin Petrov
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Paper Abstract

Disordered crystals combining the advantages of both crystals and glasses are very interesting for applications in tunable, Q-switched, and mode-locked solid-state lasers. Calcium niobium gallium garnet, Ca3(NbGa)2-xGa3O12 (CNGG), has a thermal conductivity of 4.7 Wm-1K-1 which is about 40% of that of undoped YAG and much higher than for glasses. It has a number of non-equivalent lattice sites to accommodate trivalent dopant ions, providing an effective mechanism for substantial inhomogeneous line broadening. For the Yb ion, owing to its intrinsic broad absorption and emission spectra, this line broadening effect is not so remarkable as for Nd or Tm but still the main emission band around 1028 nm of Yb:CNGG, with a FWHM of 21 nm is two times wider than the corresponding line (<10 nm) in Yb:YAG. Here, we report efficient laser operation achieved with Yb:CNGG at room temperature in cw as well as Q-switched regimes, revealing interesting characteristics of the laser oscillation. 2.0 W of cw output power were produced at an absorbed pump power of 6.32 W, leading to an optical-to-optical efficiency of 32% and a slope efficiency of 40%. The laser oscillation of the isotropic crystal was actually linearly polarized as a result of the stress-induced birefringence. Two orthogonal polarization states oscillated simultaneously at high pump power levels. Passive Q-switching by a Cr4+:YAG saturable absorber produced 1.35 W of average output power at 1033 nm at a pulse repetition rate of 16.7 kHz. The laser pulse energy, duration, and peak power were 81 μJ, 25 ns, and 3.24 kW, respectively.

Paper Details

Date Published: 27 February 2009
PDF: 8 pages
Proc. SPIE 7193, Solid State Lasers XVIII: Technology and Devices, 71932J (27 February 2009);
Show Author Affiliations
Junhai Liu, Qingdao Univ. (China)
Wenjuan Han, Qingdao Univ. (China)
Huaijin Zhang, Shandong Univ. (China)
Jiyang Wang, Shandong Univ. (China)
Valentin Petrov, Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy (Germany)

Published in SPIE Proceedings Vol. 7193:
Solid State Lasers XVIII: Technology and Devices
W. Andrew Clarkson; Norman Hodgson; Ramesh K. Shori, Editor(s)

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