We demonstrate single-longitudinal-mode and wavelength-tunable operation of Er:Y2O3 ceramic laser at ~1.6 μm using in-house fabricated low scattering loss ceramic sample and in-band pumped by an Er,Yb fiber laser at 1535 nm. Narrow linewidth and tunable laser operation has been realized using intracavity etalon of proper thickness for wavelength tuning and mode selection, yielding a wavelength tuning span of ~89 nm in the range of 1574.4 nm–1581.1 nm, 1599.4 nm-1601 nm, 1637 nm-1641.8 nm, and 1661.4 nm–1663 nm, respectively. Single-longitudinal-mode operation was confirmed using a scanning Fabry–Perot interferometer in the whole wavelength tuning range when output powers lower than ~35 mW.
We report on gain- and Q-switched operation of Er:Y2O3 ceramic laser at 1640 nm using in-house fabricated lowscattering-loss, 0.25-at.% Er3+ -doped ceramic sample. Stable gain-switched operation in pulse repetition frequencies(PRFs) of 5-50 kHz has been demonstrated using an acousto-optic modulator switched 1535 nm fiber pump source, resulting in a peak power of 16 times higher than that for CW operation. Q-switched operation in 0.5-10 kHz repetition rate has been demonstrated with AO switcher, generating stable pulses of 94 ns duration and 0.5 mJ energy at 0.5 kHz for 5.7 W of absorbed pump power, corresponding to a peak power of 5.2 kW.
We report on high power and efficient laser operation of low scattering loss Tm:Y2O3 ceramic fabricated in house via coprecipitation process. The Tm3+ ion is pumped directly to the upper energy level of the ~ 2 μm laser transition (3F4 → 3H6) using a high power 1620 nm fiber Raman laser. With an optically polished but uncoated sample of 2 at.% doping, the laser generated 11.3 W of TEM00 output power at ~2050 nm for ~19 W of absorbed pump power, corresponding to a slope efficiency of 74.4% with respect to absorbed pump power.
We report on the polarization behavior of painted samples doped with a silicone light diffusion agent and illuminated by linearly polarized laser light centered at 532 and 650 nm. Reflection spectra of the painted samples with dopant concentration of 0 and 12.2 wt.% were examined. The degree of depolarization increases from 0.35 to 0.8 under laser illumination at 650 nm and from 0.5 to 0.94 under laser illumination at 532 nm with an increasing concentration of light diffusion agent. The polarization behavior of painted samples was described, taking into account contribution of both surface scattering and volume scattering.
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