Supercontinuum Generation in Cr-Doped Bulk SrTiO3
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Bulk SrTiO3 doped by 40 keV Cr+ ions and substrate temperature Timp = 600°C is studied. This sample exhibits supercontinuum generation by amplified femtosecond laser pulses (λ = 800 nm; repetition rate, 3 kHz; pulse duration, 150 fs; pulse energy 4 µJ), recorded by a monochromator with a PMT. The blue edges of the supercontinuum spectra differ, depending on the location of the focused laser beam spot on the sample.
The authors gratefully acknowledge the CSF-SAC FRC KSC RAS for providing necessary facilities (femtosecond laser system) to carry out this work.
This work was partially supported by the Russian Foundation for Basic Research, project nos. 18-52-00026 Bel_a, 17-02-00701a, 19-02-00569, and 19-03-00635 (optical measurements), and by the government assignment for FRC Kazan Scientific Center of RAS (sample preparation).