Determination of fluorine distribution profile in optical glass by nuclear analysis methods

Measurements of chemical composition and fluorine distribution profile in two types of optical glasses LK-1 and LK-3 are carried out at the Kharkov State University electrostatic accelerator. When comparing with the synthetic composition, the real content of LK-1 and LK-3 glasses by all reliably identified elements is turned out to be similar to experiment error limits. The fluorine distribution profile of the depth is determined by means of the 19F(p,αγ)16O resonance nuclear reaction. It is detected that the fluorine concentration jump in LK-1 glass samples is shifted inside the sample at a distance of 0.6 μm, and in samples of LK-3 glasses - at a distance of 1.4 μm from the surface. The accuracy of concentration determination in the depth was not less than 0.05 μm. The presence of the fluorine concentration jump near the LK-1 glass surface explains possibly the wave-guide effect observed in these glasses by the method of resonance excitation of waveguide modes