Ultrafast saturable absorption devices incorporating efficiently electrosprayed carbon nanotubes

Suho Chu; Won-Suk Han; Il-Doo Kim; Young-Geun Han; Kwanil Lee; Sang Bae Lee; Yong-Won Song
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p051111
Academic Journal
We demonstrate saturable absorption operation of single-walled carbon nanotubes (CNTs) deposited by an efficient electrospray process that provides target-localized deposition with a homogeneous dispersion of the nanomaterials. An improvement in deposition efficiency of 95% is achieved. CNT dispersion/deposition conditions are optimized for suppressed CNT agglomeration, thereby maximizing the nonlinear absorption of CNTs. An ultrafast saturable absorber is formed with side-polished fiber as a substrate for evanescent field interaction of propagated light with CNTs. A resultant fiber mode-locked laser is realized. The laser has output with an estimated pulse duration and repetition rate of 190.9 fs and 3.95 MHz, respectively.


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