The generation of passive dual wavelengths Q-switched YDFL by MoSe₂film

Abstract

A simple ytterbium doped fiber laser (YDFL) setup was used to generate Q-switching pulses by using a D-shaped polished fiber as a wavelength selective filter. The gain medium used in the cavity was ytterbium doped fiber with length 70 cm. By utilizing a MoSe 2 film as saturable absorber into the cavity, a stable dual wavelength was produced at 1036.69 and 1039.22 nm. The wavelength separation of the output spectrum was 2.53 nm. We found a maximum pulse energy of 0.99 nJ and shortest pulse width of 1.2 µs. We have determined consistent dualwavelength Q-switching pulses for the 1-micron region.

Dual-wavelength mode-locked erbium-doped fiber laser based on tin disulfide thin film as saturable absorber

“…This indicates that the 1536.7 nm and 1562.6 nm lasing peaks have the same pulse train characteristics, which are similar to previous works. 26,27 In some situations, the dual-wavelength pulse lasers could have different pulse train characteristics. No suitable filter was available in our lab to optically filter the output.…”

Dual-Wavelength Passively Mode-Locked Yb-Doped Fiber Laser Based on a SnSe2-PVA Saturable Absorber

“…The stability of other three kinds of fundamental frequency pulses were similarly tested, and similar phenomena were observed. The mode-locked pulses could not exist if the SA was removed from the laser cavity and only Table 1 demonstrated the parameters of dual-wavelength (or multi-wavelength) passively Q-switched and mode-locked fiber lasers based on various 2D materials SAs, such as graphene [32], [45], SWNTs (single-walled carbon nanotubes) [33], [44], TMO (transition metal oxide) [34]- [36], BP (black phosphorus) [37], LMDCs [28], [38], [40] and TI (topological insulator) [39], [41]- [43], etc. Obviously, compared with other 2D materials SAs, there were narrow pulse width, high slope efficiency and low threshold in our experimental results.…”

Dual-tapered Mach Zehnder Interferometer for Dual-wavelength Q-Switched YDFL using Molybdenum Diselenide

“…In our previous work, we have explained the synthesis and preparation of the purchased bulk MoSe2 and exfoliated MoSe2 [18,19]. In the beginning, Renishaw inVia confocal Raman Microscope was used to characterize Raman shift analysis as shown in Figure 1(a).…”