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Advanced Solid-State Lasers

CW-Lasing of Pr:YAlO3 at Room Temperature

A. Bleckmann, Frank F. Heine, Jan-Peter Meyn, T. Danger, ERNST HEUMANN, Günter Huber

Published Jan 1, 1993• 3 citations
Publisher

Abstract

We describe for the first time continuous-wave oscillation of a Pr3+-doped YAlO3 crystal from the metastable levels 3P0 and 1D2 at room temperature. The oscillation wavelengths realized so far are 613.9 nm, 621.6 nm, 662.4 nm, 719.5 nm, 743.7 nm, 746.9 nm, 753.7 nm, 939.5 nm and 996.0 nm.
DOI
10.1364/assl.1993.lm6

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We report on the first observation of low temperature pulsed blue and orange laser emissions in Pr3+:YAG. Furthermore, we compare these results with similar observations in YLiF4 and YAlO3 doped crystals. Pulsed laser oscillations were obtained in crystals with uncoated surfaces by direct excitation of one of the relevant Stark components of the 3P0, 3P1 or 3P2 states. A carefull spectroscopic analysis of all these systems allows to clearly identify the laser transitions as arising from the 3P0 metastable state, the lifetime of which has been measured using a nanosecond pumped dye laser.
The optical transition (3H4→1D2) of trivalent praseodymium embedded in crystalline matrices is a promising candidate for the realization of optically controlled quantum memories. This application requires a specific laser source emitting at 606 nm whose short-term linewidth is smaller than the linewidth of the considered ion, i.e., in the kHz range. Currently, this can only be addressed with a highly frequency stabilized dye laser [1]. In order to develop a simpler all-solid-state laser source suitable for coherent processing of Pr3+, we have explored Pr3+-doped fluoride materials which are well-known to offer a large range of available laser transitions in the visible spectrum ranging from blue to red [2] including an orange one around 600 nm, the pumping transitions lying in the blue between 445 and 480 nm. The recent developments of high power blue laser diodes emitting around 445 nm enable now the pumping of Pr-doped lasers in a compact setup. We present, here, the results we obtained with the diode pumping of a Pr3+:BaY2F8(Pr:BYF) crystal which emits at 607 nm.
Single-mode cw lasing was obtained for the first time in Yb 3+ : GGG crystals at room temperature at 1.030 and 1.037 μm upon pumping Yb 3+ ions by a 0.925-μm neodymium-doped fibre laser. Lasing was observed at the transitions between the lower Stark sublevel of the 2 F 5/2 level and the upper Stark sublevels of the 2 F 7/2 ground state of Yb 3+ ions. The study of lasing characteristic showed that lasing occurs according to the four-level scheme. The lasing threshold with respect to the absorbed power was 85 mW and the slope lasing efficiency was 20%. Upon 1.7-W pumping, the output power of 310 mW was achieved with the output resonator mirror with the transmission coefficient of 1%. The effective cross section of the lasing transition was 0.9 × 10 -20 cm 2 .