Abstract

Laser action has been demonstrated in two new tunable ${\mathrm{Cr}}^{3+}$-doped crystals. Absorption, emission, and excitation measurements for various crystal orientations have been performed for chromium-doped ${\mathrm{LiInGeO}}_4$ and ${\mathrm{LiScGeO}}_4$ single crystals. From the spectroscopic measurements, two optical active centers were identified: tetrahedrally coordinated ${\mathrm{Cr}}^{4+}$ and octahedrally coordinated ${\mathrm{Cr}}^{3+}$. Gain-switched, tunable laser operation of ${\mathrm{Cr}}^{3+}$ centers has been demonstrated in both crystals. An ultrawide tuning range from 1150 to 1480 nm for ${\mathrm{LiInGeO}}_4$ and 1220–1380 nm for ${\mathrm{LiScGeO}}_4$ has been achieved. To our knowledge this is the widest bandwidth and the most near-infrared shifted wavelength range for lasing ever demonstrated for ${\mathrm{Cr}}^{3+}$ ions.

© 2005 Optical Society of America

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