Browsing by Author "Wang, Yong-Gang"

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High-power, passively mode-locked Nd:GdVO(4) laser using single-walled carbon nanotubes as saturable absorber
(2011-04-01)
Chen, Hou-Ren
;
Wang, Yong-Gang
;
Tsai, Chih-Ya
;
Lin, Kuei-Huei
;
Chang, Teng-Yao
We use a new (to our knowledge) fabrication method of a single-walled carbon nanotube (SWCNT) absorber without polymer to sustain high-power illumination. Using a series of saturable absorbers (SAs) incorporating different amounts of SWCNTs, we demonstrate mode-locking for a Nd:GdVO(4) laser in the 1 mu m spectral range. Continuous-wave mode-locking (CWML) pulses with a maximum output power of 3.6 W at 1063 nm and high noise extinction of 61 dB has been achieved to give the highest pulse peak power of 3.6 kW and pulse energy of 30 nJ under 15 W pumping. To our knowledge, this is the highest CWML output power with SWCNT-SAs reported. The measured nonlinear absorption of the SWCNT-SAs shows a modulation depth of similar to 3% with subpicosecond recovery time. (C) 2011 Optical Society of America
High-power, passively mode-locked Nd:GdVO4 laser using single-walled carbon nanotubes as saturable absorber
(2011-04-01)
Chen, Hou-Ren
;
Wang, Yong-Gang
;
Tsai, Chih-Ya
;
Lin, Kuei-Huei
;
Chang, Teng-Yao
We use a new (to our knowledge) fabrication method of a single-walled carbon nanotube (SWCNT) absorber without polymer to sustain high-power illumination. Using a series of saturable absorbers (SAs) incorporating different amounts of SWCNTs, we demonstrate mode-locking for a Nd:GdVO4 laser in the 1 mu m spectral range. Continuous-wave mode-locking (CWML) pulses with a maximum output power of 3.6 W at 1063 nm and high noise extinction of 61 dB has been achieved to give the highest pulse peak power of 3.6 kW and pulse energy of 30 nJ under 15 W pumping. To our knowledge, this is the highest CWML output power with SWCNT-SAs reported. The measured nonlinear absorption of the SWCNT-SAs shows a modulation depth of similar to 3% with subpicosecond recovery time. (C) 2011 Optical Society of America
Saturable absorber using single wall carbon nanotube-poly (vinylalcohol) deposited by the vertical evaporation technique
(2011-03-01)
Tai, Po-Tse
;
Pan, Shu Di
;
Wang, Yong-Gang
;
Tang, Jau
;
光電工程學系
We employed a vertical evaporation technique to fabricate saturable absorbers by embedding single wall carbon nanotubes (SWCNT) in polymer (vinylalcohol). Two fast recovery time constants, 250 fs and 1.13 ps, respectively, were measured for the absorbers using a transient absorption experimental setup. The saturation intensity of the absorber was found to be 300-400 mu J/cm(2) at 1060 nm, and a modulation depth as high as 3.5% was achieved. (C) 2010 Elsevier B.V. All rights reserved.