Browsing by Author "Hsieh, Wen Feng"

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A highly efficient graphene oxide absorber for Q-switched Nd:GdVO(4) lasers
(2011-11-11)
Wang, Yong Gang
;
Chen, Hou Ren
;
Wen, Xiao Ming
;
Hsieh, Wen Feng
;
Tang, Jau
We demonstrated that graphene oxide material could be used as a highly efficient saturable absorber for the Q-switched Nd:GdVO(4) laser. A novel and low-cost graphene oxide (GO) absorber was fabricated by a vertical evaporation technique and high viscosity of polyvinyl alcohol (PVA) aqueous solution. A piece of GO/PVA absorber, a piece of round quartz, and an output coupler mirror were combined to be a sandwich structure passive component. Using such a structure, 104 ns pulses and 1.22 W average output power were obtained with the maximum pulse energy at 2 mu J and a slope efficiency of 17%.
A highly efficient graphene oxide absorber for Q-switched Nd:GdVO4 lasers
(2011-11-11)
Wang, Yong Gang
;
Chen, Hou Ren
;
Wen, Xiao Ming
;
Hsieh, Wen Feng
;
Tang, Jau
We demonstrated that graphene oxide material could be used as a highly efficient saturable absorber for the Q-switched Nd:GdVO4 laser. A novel and low-cost graphene oxide (GO) absorber was fabricated by a vertical evaporation technique and high viscosity of polyvinyl alcohol (PVA) aqueous solution. A piece of GO/PVA absorber, a piece of round quartz, and an output coupler mirror were combined to be a sandwich structure passive component. Using such a structure, 104 ns pulses and 1.22 W average output power were obtained with the maximum pulse energy at 2 mu J and a slope efficiency of 17%.
Wall paper single-walled carbon nanotubes absorber for passively mode-locked Nd: GdVO4 laser
(2012-04-01)
Wang, Yong Gang
;
Chen, Hou Ren
;
Wen, Xiao Min
;
Hsieh, Wen Feng
;
Tang, Jau
A novel and low-cost wall paper single-walled carbon nanotubes (SWCNTs) absorber was fabricated by high viscosity of polyvinyl alcohol (PVA) aqueous solution and vertical evaporation technique. Sandwich structure wall paper SWCNT (SSWA-SWCNT) absorber was constructed by a piece of wall paper SWCNT absorber, a piece of round quartz and an output coupler mirror. We exploited it to realize mode locking operation in a diode-pumped Nd: GdVO4 laser. A pulse duration of 9.6 ps was produced with an average power of 870 mW. The stable mode locking operation was obtained when the average power is less than 300 mW. (C) 2011 Elsevier B.V. All rights reserved.
Watt-level high power passively mode-locked Nd:LuVO4 laser with carbon nanotube saturable absorber at 1.34 mu m
(2012-11-01)
Wang, Yong Gang
;
Chen, Hou Ren
;
Hsieh, Wen Feng
;
Tsang, Yuen H.
;
光電工程學系
The first Nd:LuVO4 ultrafast mode locking laser operating at 1.34 mu m is demonstrated by utilizing a polymer free single-walled carbon nanotube (SWCNT) absorber fabricated by the vertical evaporation technique. The fast recovery times of the absorber were measured to be 40 fs and 820 fs. The modulation depth of the absorber was about 2%. Passively mode-locked Nd:LuVO4 laser using this absorber was demonstrated. As high as 1.74 W continuous wave mode-locked pulses have been achieved with the pulse duration of 18 ps and the repetition of 125 MHz. Such kind of absorbers have great potential to be put into practical use because of their merit of high damage threshold, broad operational wavelength range and low cost of fabrication. (C) 2012 Elsevier B.V. All rights reserved.