7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Vacuum ultraviolet spectroscopy of calcium fluoride crystals

9 Jul 2014, 14:40
20m
D Les 102

D Les 102

Oral Presentation Track C - Photonics Photonics

Speaker

Mr Tresor MATINDI (University of Stellenbosch)

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

In this project experimental setups and techniques for measuring the absorption and excitation spectra of pure and lead (Pb) doped calcium fluoride (CaF2) crystal samples in the vacuum ultraviolet (VUV) spectral range are developed. This study is conducted using tuneable vacuum ultraviolet (VUV) laser light with a narrow spectral bandwidth generated by a 3rd order nonlinear optical process. This is the first spectroscopic study of an alkaline fluoride using tuneable VUV laser radiation and therefore of strategic importance. This spectroscopic study should yield a more complete spectral characterization of the doped and pure CaF2 which will contribute to the understanding of the different types of defects, their energy levels and formation mechanisms. As first step absorption measurements over the spectral range 115-180 nm have been obtain using a vacuum scanning (McPherson model 225) with a deuterium lamp (McPherson model 632). Our results show that total absorption of the VUV light by CaF2 can be observed in 115-126 nm range. The observed absorption features in the 126-180 nm range vary in different samples and correlate with information from the supplier. In addition, the effect of vacuum and gas purged conditions and the stray light background in the monochromator have been determined.

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

MSc

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

Dr. Christine M. Steenkamp, Laser Research Institute ,Physics Department, Stellenbosch University

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Primary author

Mr Tresor MATINDI (University of Stellenbosch)

Co-authors

Dr Christine Steenkamp (University of Stellenbosch) Prof. Erich Rohwer (University of Stellenbosch) Prof. Herbert Stafast (Leibniz-Institute of Photonic Technology)

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