I am using a 980 nm laser to excited some glass samples doped with Yb3+ ions. At around 480-490 nm, I observed a strong peak in its emission spectrum. Is it a upconverted blue emission from Yb3+ ions or the harmonic of laser? If none, what are the other possibilities?
Details: The laser is set at 800 mW. The samples have good non-linear behavior, I believe (not tested). The glasses are in powder form! The emission spectra are collected by transferring the powder to an Quartz cuvette, which is fully transparent in studied region.
see the "Excited Stat Absorption" where the ion Yb 3+ absorbs from the excited stat so the emission is higher then the regular
Easily you can check it by changing the sample. If you still see the same emission with changing the samples, then it may arise from the setup of your laser system.
It's definately not luminescence of Yb3+ - there is no energy levels that could produce it (look up Dieke diagram). I agree with previous coment that you should check if 480nm peak appears without sample as well - than it is laser. If not, maybe you have compound in your glass that could produce this luminescence? Yb3+ is known as really good sensitizer.
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