An all fiberized, 1.89-μm Q-switched laser employing carbon nanotube evanescent field interaction

• DOI: 10.7452/lapl.201210061
• Publication Date: 2012-07-01T06:24:33Z
• Authors: M Jung; J Koo; Y M Chang; P Debnath; Y-W Song; J H Lee
• Keywords: 0103 physical sciences; 01 natural sciences

An all-fiber-integrated, Q-switched thulium-doped fiber laser based on carbon nanotube (CNT) evanescent field interaction is experimentally demonstrated. It is shown that a saturable absorber based on a CNT-deposited D-shaped fiber can readily be incorporated into a thulium-doped fiber ring cavity for a passive Q-switching operation at a wavelength of ~ 1.89 μm. Using the laser scheme stable Q-switched pulses with a temporal width of ~ 7.155 μs could be obtained at a repetition rate of 14.18 kHz. The temporal stability of the output pulses was also investigated.