All-fiber Er-doped dissipative soliton laser based on evanescent field interaction with carbon nanotube saturable absorber

Abstract

We report on an Er-doped fiber pulse laser at large net normal dispersion cavity by employing a dispersion compensating fiber in combination with a single-walled carbon nanotube (SWCNT) saturable absorber. A SWCNT/polymer composite film uniformly spin-coated on the side-polished fiber is prepared for robust and efficient nonlinear interaction with evanescent fields in the waveguide expecting increase of optical and thermal damage threshold compared to previously reported direct coating of SWCNTs on fiber ferrules. The fabricated dissipative soliton fiber laser exhibits high average output power of 55.6 mW, corresponding to pulse energy about 2.35 nJ. Highly chirped 5.8 ps pulses are generated with a spectral bandwidth of 13.9 nm and compressed down to 226 fs using additional length of conventional optical fiber at extra-cavity.

Chirped pulse amplified dissipative-soliton Erbium-doped fiber lasers

“…Thus, it is possible to generate DSs in our dispersion-managed cavity, and DSs are finally generated when the net dispersion is increased to 0.12 ps 2 by decreasing the length of fibers with anomalous dispersion in the cavity. Note that this value of net dispersion is in the range of DS generation, as reported by many other experiments [13,[24][25][26][27][28]. A filter is usually employed in a DS laser to offer an additional amplitude modulation to generate DSs.…”

“…A filter is usually employed in a DS laser to offer an additional amplitude modulation to generate DSs. In our DS laser, the filter is formed by the narrow gain bandwidth of the EDF [13,[24][25][26][27][28]. In the laser, mode locking is initiated by nonlinear polarization rotation, which relies on intensity-dependent rotation of an elliptical polarization state in a length of optical fiber.…”

Generation of Soliton Molecules in a Normal-Dispersion Fiber Laser

“…The net normal dispersion of the cavity is increased by cutting the length of anomalous-dispersion fibers. Finally, DSs are generated when the net dispersion is 0.1 ps 2 with a cavity length of 8.6 m. Note that this value of net dispersion is in the range of DS generation as reported by many experiments [17]- [22]. A filter is usually employed in a DS laser to offer an additional amplitude modulation to generate DSs.…”

Modeling Frequency Comb Sources

“…In experiments, DSs with 20 nJ single-pulse energy have been demonstrated when a long segment of polarization-maintaining fiber is used in the cavity to reduce the NPE response [60]. But DSs are difficult to be de-chirped especially with highenergy pulses because of the nonlinearity of the chirp and the complex spectral structure [59,60,90].…”