Room-temperature subnanosecond waveguide lasers in Nd:YVO4 Q-switched by phase-change VO2: A comparison with 2D materials
AuthorNie, W; Li, R; Cheng, C; Chen, Y; Lu, Q; Romero, C; Vazquez de Aldana, JR; Hao, X; Chen, F
Source TitleScientific Reports
PublisherNATURE PUBLISHING GROUP
University of Melbourne Author/sHao, Xiaotao
AffiliationSchool of Chemistry
Document TypeJournal Article
CitationsNie, W., Li, R., Cheng, C., Chen, Y., Lu, Q., Romero, C., Vazquez de Aldana, J. R., Hao, X. & Chen, F. (2017). Room-temperature subnanosecond waveguide lasers in Nd:YVO4 Q-switched by phase-change VO2: A comparison with 2D materials. SCIENTIFIC REPORTS, 7 (1), https://doi.org/10.1038/srep46162.
Access StatusOpen Access
We report on room-temperature subnanosecond waveguide laser operation at 1064 nm in a Nd:YVO4 crystal waveguide through Q-switching of phase-change nanomaterial vanadium dioxide (VO2). The unique feature of VO2 nanomaterial from the insulating to metallic phases offers low-saturation-intensity nonlinear absorptions of light for subnanosecond pulse generation. The low-loss waveguide is fabricated by using the femtosecond laser writing with depressed cladding geometry. Under optical pump at 808 nm, efficient pulsed laser has been achieved in the Nd:YVO4 waveguide, reaching minimum pulse duration of 690 ps and maximum output average power of 66.7 mW. To compare the Q-switched laser performances by VO2 saturable absorber with those based on two-dimensional materials, the 1064-nm laser pulses have been realized in the same waveguide platform with either graphene or transition metal dichalcogenide (in this work, WS2) coated mirror. The results on 2D material Q-switched waveguide lasers have shown that the shortest pulses are with 22-ns duration, whilst the maximum output average powers reach ~161.9 mW. This work shows the obvious difference on the lasing properties based on phase-change material and 2D materials, and suggests potential applications of VO2 as low-cost saturable absorber for subnanosecond laser generation.
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