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A novel broadband saturable absorber in the near infrared spectral region with cobalt-doped tellurite glasses

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Abstract

It has become a focus of interest for researchers to develop solid-state materials that possess saturable absorption applicable in passive Q-switching techniques. Of practical interest are materials to be useful in a wide spectral range, and particularly in the mid-infrared eye-safe spectral range. Recent researches discovered that tellurite glasses have many superior properties, and that various structural units in the matrices can be technically controlled by glass network modifiers to broaden the absorption bands. In this report, we report on a novel material of cobalt doped tellurite glasses, which have much broader saturable absorption bands than the cobalt doped crystals such as Co2+:ZnSe, Co2+:Y3Sc2Ga3O12, Co2+:MgAl2O4 Co2+:Y3Al5O12, and Co2+:LaMgAl11O19 [1]. As shown in Fig. 1, the absorption bands are 850-2500 nm for samples with Co2+ concentrations of 0.5, 1.0, 2.5 at.%, respectively. Ground state absorption cross section σgs at 1064 nm was measured by small signal transmittance (0.5%:σgs =4.72×10−20 cm2 1.0%:σgs =4.02 ×10−20 cm2 2.5%:σ = 4.45 20 gs ×10 cm2). Optical nonlinearities occur for the vibronically broadened transition 4A2(4F) →4T1(4F) of the Co2+ ion. Saturable absorption was measured using the z-scan technique. By numerically fitting the z-scan experimental data, the excited-state absorption cross sections at the laser wavelength of 1064 nm are to be σ =1.45 20 es ×10 and σ =1.15 20 es ×10− 2 for 1.0 and 2.5 at.% Co2+ doped glasses, respectively. Our experimental data clearly indicated that the cobalt-doped tellurite glasses have a bright prospect as broadband solid-state saturable absorbers in the near infrared spectral region.

© 2003 Optical Society of America

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