| Abstract [eng] |
In this paper supercontinuum generation in LiYF4 (YLF), CaF2 and Al2O3 crystals were investigated pumping by wavelengths at 400 nm and 800 nm with pulse duration of 100 fs. Moreover, standard deviations of spectrum intensities were calculated giving more information about stability and its evaluation what is important for practical applications. It was demonstrated that supercontinuum generation in YLF crystal can be used for applications in UV and IR spectral regions. However, for stable continuum generation YLF crystal has to be translated in order to avoid laser induced damage. Comparing YLF and CaF2 spectrums broadenings – they are quite similar, but supercontinuum generated in CaF2 is more stable with intensity noise (standard deviation) at 10% in UV region and 15 % in IR region. Short time stability in the YLF crystal is 50 % of standard deviation value in UV region and 30 % in IR region. Among all crystals investigated in this work Al2O3 produces the most stable supercontinuum which spans from 370 nm to 530 nm pumping with 400 nm and 450 nm – 980 nm pumping with 800 nm. The standard deviation of Al2O3 produced spectrum is not exceeding 3 % which makes this crystal ideal for applications in near UV region and near IR. It was showed that YLF crystal can be used for supercontinuum generation, but it is more appealing to use CaF2 crystal for generation in UV region or Al2O3 when deep UV radiation is not required. |
