Browsing by Author "Liu, J."

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Fabrication and characterization of double-wall carbon nanotube absorber for passive mode-locked Nd:GdVO(4) laser
(2011-10-01)
Wang, Y. G.
;
Qu, Z. S.
;
Liu, J.
;
Tang, J.
;
光電工程學系
Using the vertical evaporation technique we fabricated saturable absorbers by transferring the double-wall carbon nanotubes (DWCNT) onto a hydrophilic quartz substrate. The fast recovery time and the saturation intensity of the absorber were measured to be 228 fs and 130 mu J/cm(2), respectively, at 1060 nm. The modulation depth of the absorber was about 3.7%. Passive mode-locked Nd:GdVO(4) laser was demonstrated. The continuous wave mode-locked pulses pulse duration is 5.6 ps and the largest average output power is 1.2 W at the pump power of 9.5 W. To the best of our knowledge, this is the first demonstration of high power continuous wave mode locking laser with DWCNT absorber.
Fabrication and characterization of double-wall carbon nanotube absorber for passive mode-locked Nd:GdVO4 laser
(2011-10-01)
Wang, Y. G.
;
Qu, Z. S.
;
Liu, J.
;
Tang, J.
;
光電工程學系
Using the vertical evaporation technique we fabricated saturable absorbers by transferring the double-wall carbon nanotubes (DWCNT) onto a hydrophilic quartz substrate. The fast recovery time and the saturation intensity of the absorber were measured to be 228 fs and 130 mu J/cm(2), respectively, at 1060 nm. The modulation depth of the absorber was about 3.7%. Passive mode-locked Nd:GdVO4 laser was demonstrated. The continuous wave mode-locked pulses pulse duration is 5.6 ps and the largest average output power is 1.2 W at the pump power of 9.5 W. To the best of our knowledge, this is the first demonstration of high power continuous wave mode locking laser with DWCNT absorber.
Polarization-dependent pulse compression in an argon-filled cell through filamentation
(2008-01-01)
Liu, J.
;
Chen, X. W.
;
Li, R. X.
;
Kobayashi, T.
;
電子物理學系
Pulse compression through filamentation in an argon-filled cell was experimentally demonstrated by using circularly and linearly polarized pulses. A 53 fs circularly polarized pulse was successfully compressed to 15 fs. By using circularly polarized pulse input, the broadened spectrum was much wider and the incident energy in the gas cell can be increased by more than 3/2 times. Much shorter pulse could be compressed by using circularly polarized pulse input. [GRAPHICS] The temporal profile of the compressed pulse (C) 2008 by Astro Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA.
Single 10-fs deep-ultraviolet pulses generated by broadband four-wave mixing and high-order dispersion compensation
(2011-12-01)
Kida, Y.
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Liu, J.
;
Kobayashi, T.
;
電子物理學系
;
Department of Electrophysics
Broadband chirped-pulse four-wave mixing and a pulse compressor consisting of a prism pair and a grating pair are used to generate 10.3-fs deep-ultraviolet pulses. A large proportion of the dispersion up to 1000 fs(2) is compensated without inducing third-order dispersion, which together with the smooth spectral and temporal profiles of the pulses makes them suitable for ultrafast spectroscopy. Unexpected spectral narrowing is observed when short input pulses were used for four-wave mixing. This narrowing is explained in terms of other third-order nonlinear phenomena, namely self-phase and cross-phase modulations, which occur simultaneously with four-wave mixing.