S. Y. Chenga, Y. G. Wanga, *, P. Yua, Y. J. Chenga, J. Tanga, **, H. R. Chenb, and W. F. Hsiehb
a Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan
b Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan
*e-mail: chinawygxjw@hotmail.com
**e-mail: jautang@gate.sinica.edu.tw
Received June 17, 2011; in final form, June 21, 2011; published online October 24, 2011
Abstract—Using the vertical evaporation technique we fabricated saturable absorbers by transferring the
water-soluble single wall carbon nanotubes (SWCNT) onto a hydrophilic quartz substrate. The fast recovery
times of the absorber were measured to be 136 and 790 fs. The modulation depth of the absorber was about 2%.
Passive mode-locked Nd:GdVO4 laser using such an absorber was demonstrated. The continuous wave mode-
locked pulses with the pulse duration of 12.4 ps and the repetition of 120 MHz were achieved. The maximum
average output power of the mode-locked laser is 2.4 W at the pump power of 13 W. Such kind of absorber has
potential to be put into practical use for high power solid-state laser mode locking.
10.1134/S1054660X11230046
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