Journal
OPTICS LETTERS
Volume 44, Issue 3, Pages 699-702Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.000699
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Funding
- National Natural Science Foundation of China (NSFC) [61575110, 61675116, 51321091]
- Development Program for Public Welfare in Shandong [2017GGX20134]
- Young Scholars Program of Shandong University [2017 WLJH48]
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We successfully fabricated the high-quality few-layered alpha-In2Se3 and investigated its carrier dynamics and nonlinear optical absorption properties by pump-probe and open-aperture Z-scan technologies. Intra- and inter-band relaxation times were determined to be 7.2 ps and 270 ps, respectively, and the effective nonlinear absorption coefficient was measured as beta(eff) = -3.9 x 10(3) cm/GW (1064 nm). Based on alpha-In2Se3 saturable absorber, a continuous-wave mode-locking operation was realized. Pulse duration, repetition rate, and maximum output power were measured to be 352 fs, 42.4 MHz, and 0.56 W, corresponding to pulse energy of 13.2 nJ and peak power of 37.5 kW. To the best of our knowledge, this is the first demonstration of non-transition metal chalcogenides applied in ultrafast all-solid-state bulk lasers. This work well verified that alpha-In2Se3 should be a promising optical modulator candidate for all-solid-state lasers. (C) 2019 Optical Society of America
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