Multiwavelength mode-locked erbium-doped fiber laser based on the interaction of graphene and fiber-taper evanescent field

Abstract

We report on the generation of multiwavelength passively mode-locked pulses in an erbium-doped fiber laser (EDFL) based on the interaction of graphene and fiber-taper evanescent field. Graphene-polymer nanocomposites in aqueous suspension are trapped by the optical evanescent light and deposited on taper region. The graphene-deposited fibertaper device not only acts as an excellent saturable absorber for mode-locking, but also induces a polarizing effect to form an artificial birefringent filter for multiwavelength selection. By simultaneously exploiting both functions of this device, four-wavelength continuous-wave mode-locking operation of an EDFL is stably initiated with a pulse width of 8.8 ps and a fundamental repetition rate of 8.034 MHz. This is the first time, to our knowledge, the mode-locked EDFL using such a new geometry of graphene-based tapered-fiber saturable absorber has been demonstrated. LD @ 974 nm WDM 3-m EDF ISO 10% output 90:10 OC 13-m SMF PC Graphene-deposited fiber-taper mode-lockerExperimental setup of the multiwavelength passively modelocked EDFL based on the graphene-deposited fiber-taper device

InGaN-LD-Pumped <inline-formula> <tex-math notation="TeX">${\rm Pr}^{3+}$</tex-math></inline-formula>: <inline-formula> <tex-math notation="TeX">${\rm LiYF}_{4}$</tex-math></inline-formula> Continuous-Wave Laser at 915 nm

“…2. This could be exploited advantageously for Q-switching or mode-locking laser operation by using an acousto-optic modulator [15] or well-known saturable absorbers such as Cr:YAG [16], SESAM [17] or some (now-popular) graphene [18], [19].…”

Switchable Dual-Wavelength Cylindrical Vector Beam Generation From a Passively Mode-Locked Fiber Laser Based on Carbon Nanotubes

“…It is indicated that the MSC play an important role for dual-wavelength generation. We reckoned that the dual-wavelength generation mechanism may be the combined result of wavelength-dependent gain distribution of the laser and induced birefringence [39], [40] by the MSC owing to its asymmetrical tapering [41]. Wavelength-dependent intracavity loss has been utilized to implement dual-wavelength generation [42].…”

Characterization of the terbium-doped calcium fluoride single crystal

“…The presence of terbium ions leads to high (but still not as high as in TGG) absorption at 485 nm and in the longer than 1600 nm wavelength range, but in the 500-1600 nm range the transmittance change is within the instrumental error. Especially draws attention the fact that Tb:CaF 2 retains high transparency in longer wavelengths range than the traditional TGG crystal, which opens up prospects of its use for erbium-doped fiber lasers wavelengths range (''eye-safe'' range 1530-1620 nm) becoming more popular lately [25][26][27].…”