Journal
NANOSCALE
Volume 12, Issue 2, Pages 1061-1066Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr08980b
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Funding
- Key Research and Development Program of Shandong Province [2018GGX102005]
- Natural Science Foundation of Qingdao [18-2-2-11-jch]
- NSFC programs [61775123]
- SDUST Research Fund [2019TDJH103, SDKDYC190212]
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Platinum diselenide (PtSe2), a type-II Dirac semi-metal material, is a potential saturable absorber (SA) to generate visible pulsed lasers due to its prominent optoelectronic properties. A high quality PtSe2 thin film was fabricated by combining magnetron sputtering with chemical vapor deposition methods; then, its microtopography was characterized by atomic force microscopy. The saturable absorption properties and electron relaxation time in the visible region were measured via open-aperture Z-scan and femtosecond pump probe technology, respectively. The modulation depth and saturable intensity are 39.9% and 256.6 GW cm(-2), respectively. The relaxation time constants were fitted to be tau(1) = (1.405 +/- 0.024) ps, tau(2) = (99.03 +/- 0.01) ps, and tau(3) = (2.032 +/- 0.27) ns. The as-prepared PtSe2 thin film was experimentally applied as a novel SA to achieve a stable passively Q-switched (PQS) Pr:YLF visible laser. A shortest pulse width of 91.8 ns with a maximum repetition rate of 297.6 kHz was obtained. These results demonstrate that the PtSe2 thin film has promising applications in generating visible pulsed lasers.
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