Dual-wavelength passively Q-switched Erbium doped fiber laser based on an SWNT saturable absorber

Dual-wavelength passively Q-switched Erbium-doped fiber laser with MWCNTs slurry as saturable absorber

“…The OSA trace is shown in Fig. 4 showing the 3dB bandwidth at 1532.32nm is around 2.5nm, higher than the wavelength at 1556.97nm which is around 0.6nm, showing same phenomena as reported in [1]. Fig.…”

“…The experimental research revealed that the passively Q-switched laser oscillated simultaneously at 1532.32nm and 1556.97nm with a 24.67nm peak separation with a threshold input pump power of 26mW and maximum input pump power of 74mW. The threshold pump power for dual wavelength passively Q-switched is lower than in the research reported in [1,4,11,13] that uses SWNT, BP, Bi 2 Se 3 , and graphene-based SA. The OSA trace is shown in Fig.…”

“…The generated pulse produced maximum pulse energy and maximum peak power of 11.97nJ and 2.05mW, respectively at maximum input pump power. The recorded signal to noise ratio is about 62dB and shows that the proposed MWCNTs slurry based SA is able to generate dual wavelength Qswitched pulse laser with a high stability pulse.The generation of high energy laser pulses often utilizes Q-switching fiber lasers technology that brings about various applications in many industrial and scientific sectors including laser processing, medicine, telecommunications, range finding, metal cutting and remote sensing [1][2]. Actively Q-switched fiber lasers use optical modulation devices which made them more complicated as compared to the passively Q-switching techniques.…”

“…The generation of high energy laser pulses often utilizes Q-switching fiber lasers technology that brings about various applications in many industrial and scientific sectors including laser processing, medicine, telecommunications, range finding, metal cutting and remote sensing [1][2]. Actively Q-switched fiber lasers use optical modulation devices which made them more complicated as compared to the passively Q-switching techniques.…”

“…In a fiber laser, the generation of a passively dual wavelength laser was demonstrated by using a various range of materials as a saturable absorber, including selenium bismuth (Bi 2 Se 3 ), graphene, tungsten disulphide (WS 2 ), molybdenum disulphide (MoS 2 ), black phosphorus (BP) as well as SWNTs, among many others [1][2][3][4][11][12][13][14]. For instance, passively Q-switched EDFL based on a SWNT/polymide polymer composite based saturable absorber was shown to oscillate simultaneously at 1532nm and 1558nm with 26nm peak separation within the range input pump power from 62mW to 120mW [1]. Graphene-based SA is also widely used in Q-switched dual wavelength pulse laser generation taking examples of the work by Luo et al [2] and Wang et al [13] [4].…”