Photonic crystal fiber based dual-wavelength Q-switched fiber laser using graphene oxide as a saturable absorber

Abstract

A Q-switched dual-wavelength fiber laser with narrow channel spacing is proposed and demonstrated. The fiber laser is built around a 3 m long erbium doped fiber as the gain medium and a 10 cm long photonic crystal fiber (PCF) as the element used to generate the dual-wavelength output. The PCF has a solid core approximately 4.37 μm in diameter and is surrounded by microscopic air-holes with a diameter of about 5.06 μm each as well as a zero-dispersion wavelength of about 980 nm. A graphene oxide based saturable absorber is used to generate the desired pulsed output. At the maximum pump power of 72 mW the laser is capable of generating pulses with a repetition rate and pulse-width of 31.0 kHz and 7.0 μs, respectively, as well as an average output power and pulse energy of 0.086 mW and 2.8 nJ, respectively. The proposed fiber laser has substantial potential for use in applications that require longer duration pulsed outputs such as in range finding and terahertz radiation generation.

Dual-wavelength Q-switched pulse generation using D-fibre and MoS2 saturable absorber

“…The efficiency of the EDFL is calculated to be 1.1% from the slope of the output-power dependence. It is worthwhile that the efficiency of the dual-wavelength Q-switched laser based on the cavity suggested by us is somewhat higher than the values achieved with the other generation methods [2,16] and close to those reported in Refs. [1,4].…”

Mode-locked and Q-switched fiber lasers with graphene oxide based saturable absorber

“…Researchers are still making considerable efforts to optimize the characteristics of graphene oxide to obtain more flexible pulse output. A number of research groups worldwide have used graphene oxide for passive Q-switching in fiber lasers [50][51][52][53][54][55][56][57][58]. In 2013, Yu et al demonstrated an ytterbium-doped Q-switched fiber laser for the first time [54].…”

Manipulating of nanometer spacing dual-wavelength by controlling the apodized grating depth in microring resonators

“…Another configuration of tunable dual-wavelength is demonstrated in [8], wherein a high birefringence FBG stabilizes a dual-wavelength laser produced when the polarization state of each wavelength is altered using a polarization controller. A large number of researchers have investigated the distinctive properties of photonic crystal fibers, such as wide range single mode operation, dispersion flexibility, large mode area and its application in multi-wavelength generation [9][10][11][12]. In most cases, these properties were proven to be wavelength dependent and equivalent to the behavior of wavelength-selective filters [13,14].…”