Passively dual-wavelength Q-switched ytterbium doped fiber laser using Selenium Bismuth as saturable absorber

Abstract

This paper describes a demonstration of a passively dual-wavelength Q-switched ytterbium-doped fiber laser using a selenium bismuth-based saturable absorber. By utilizing a short-length photonic crystal fiber in a ring cavity and performing adjustments to the polarization state of an incorporated polarization controller (PC), we obtained a stable dual-wavelength Q-switched output at 1037.14 and 1037.69 nm, with maximum pulse energy of 0.65 nJ, shortest pulse width of 8.46 μs, and pulse repetition rate from 15.37 to 59.24 kHz. The Q-switched laser output consistently achieved high-power stability with a 0.8 dB maximum fluctuation over a period of 20 min.

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

“…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 a maximum peak power and maximum pulse energy of 2.05mW and 11.97nJ, respectively, at maximum input pump power. Figures 6 and 7 show a typical trend of the Q-switched pulse laser as reported by other researchers [1][2][3][4][11][12][13][14], with the advantage of dual wavelength generation. The stability of the generated pulse was further investigated using a radio frequency spectrum analyzer (RFSA) to measure the signal-to-noise ratio (SNR).…”

“…Figure 6 illustrates the repetition and pulse width versus the input pump power. By increasing the input pump power from 26mW to 74mW, the pulse train repetition rate increases from 25kHz to 78kHz, while the pulse width is narrowed from 17.84s to 5.24μs, making the obtained shortest pulse width better than the reported works in [8,11,15]. Figure 7 shows instantaneous peak power and pulse energy versus pump power.…”

“…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].…”

Generation of passively Q-switched fiber laser at 1 μm by using MoSSe as a saturable absorber

“…As a result of this, research has now focused on the exploration of new materials for use as SAs. Among the materials being explored are topological insulators (TIs), such as (Bi 2 Se 3 ) [9][10][11][12][13] and bismuth telluride (Bi 2 Te 3 ) [14,15] , which have already seen applications in various Q-switched fiber laser designs. Another potential material is transition metal dichalcogenides (TMDs).…”