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Developing high energy dissipative soliton fiber lasers at 2 micron.

Huang C, Wang C, Shang W, Yang N, Tang Y, Xu J - Sci Rep (2015)

Bottom Line: Numerical simulation predicts the existence of stable 2 μm dissipative soliton solutions with pulse energy over 10 nJ, comparable to that achieved in the 1 μm and 1.5 μm regimes.Experimental operation confirms the validity of the proposal.These results will advance our understanding of mode-locked fiber lasers at different wavelengths and lay an important step in achieving high energy ultrafast laser pulses from anomalous dispersion gain media.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

ABSTRACT
While the recent discovered new mode-locking mechanism--dissipative soliton--has successfully improved the pulse energy of 1 μm and 1.5 μm fiber lasers to tens of nanojoules, it is still hard to scale the pulse energy at 2 μm due to the anomalous dispersion of the gain fiber. After analyzing the intracavity pulse dynamics, we propose that the gain fiber should be condensed to short lengths in order to generate high energy pulse at 2 μm. Numerical simulation predicts the existence of stable 2 μm dissipative soliton solutions with pulse energy over 10 nJ, comparable to that achieved in the 1 μm and 1.5 μm regimes. Experimental operation confirms the validity of the proposal. These results will advance our understanding of mode-locked fiber lasers at different wavelengths and lay an important step in achieving high energy ultrafast laser pulses from anomalous dispersion gain media.

No MeSH data available.


Related in: MedlinePlus

Intracavity Dynamics.(a) Pulse duration (black triangles) and spectral bandwidth (red circles) evolution. (b) Temporal phase of the solution to the laser plotted after DCF (black solid), after GF (red dashed), after SMF (blue dotted). (c) Temporal and (d) spectral profiles of the pulse after SMF, GF, DCF, SA, DCF, GF, SMF, respectively.
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f2: Intracavity Dynamics.(a) Pulse duration (black triangles) and spectral bandwidth (red circles) evolution. (b) Temporal phase of the solution to the laser plotted after DCF (black solid), after GF (red dashed), after SMF (blue dotted). (c) Temporal and (d) spectral profiles of the pulse after SMF, GF, DCF, SA, DCF, GF, SMF, respectively.

Mentions: A schematic model for the mode-locked laser is illustrated in Fig. 1(a). The single mode fiber (SMF), DCF, and GF complete the dispersion map. The GF is a highly thulium doped single mode fiber. Simulation is carried out through solving the nonlinear Schrodinger equation (NLSE). Detailed parameters of all related elements are present in Methods. Start with white noise, the calculation proceeds until a steady state is reached. A typical and stable solution with pulse energy of 5 nJ is obtained when Psat = 3.5 kW and Esat = 3.4 nJ are set, and its pulsing and spectral evolutions are shown in Fig. 2. Owing to the joint effects of normal group velocity dispersion (GVD) and nonlinearity (NL) in DCF, the pulse propagates with its duration increasing monotonically. The weakly broadened pulse is then compressed by the SMF and GF segments with anomalous GVD. The spectral bandwidth of the pulse with steep edges is nearly constant during its circling in the cavity. However, the spectrum top exhibits sharp peaks near the edges after the pulse is amplified in the GF and then undergoes self-phase modulation in the followed DCF. Then the spectrum is reshaped by SA, DCF, GF, and SMF, successively, and evolves back to the near-flat top shape. Figure 2(b) shows the temporal phase shape evolution in the three kinds of fibers (DCF, GF and SMF). We see that there is only a small amount of phase shift induced by the short GF, which is effectively compensated by the other two kinds of fibers (DCF and SMF).


Developing high energy dissipative soliton fiber lasers at 2 micron.

Huang C, Wang C, Shang W, Yang N, Tang Y, Xu J - Sci Rep (2015)

Intracavity Dynamics.(a) Pulse duration (black triangles) and spectral bandwidth (red circles) evolution. (b) Temporal phase of the solution to the laser plotted after DCF (black solid), after GF (red dashed), after SMF (blue dotted). (c) Temporal and (d) spectral profiles of the pulse after SMF, GF, DCF, SA, DCF, GF, SMF, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562253&req=5

f2: Intracavity Dynamics.(a) Pulse duration (black triangles) and spectral bandwidth (red circles) evolution. (b) Temporal phase of the solution to the laser plotted after DCF (black solid), after GF (red dashed), after SMF (blue dotted). (c) Temporal and (d) spectral profiles of the pulse after SMF, GF, DCF, SA, DCF, GF, SMF, respectively.
Mentions: A schematic model for the mode-locked laser is illustrated in Fig. 1(a). The single mode fiber (SMF), DCF, and GF complete the dispersion map. The GF is a highly thulium doped single mode fiber. Simulation is carried out through solving the nonlinear Schrodinger equation (NLSE). Detailed parameters of all related elements are present in Methods. Start with white noise, the calculation proceeds until a steady state is reached. A typical and stable solution with pulse energy of 5 nJ is obtained when Psat = 3.5 kW and Esat = 3.4 nJ are set, and its pulsing and spectral evolutions are shown in Fig. 2. Owing to the joint effects of normal group velocity dispersion (GVD) and nonlinearity (NL) in DCF, the pulse propagates with its duration increasing monotonically. The weakly broadened pulse is then compressed by the SMF and GF segments with anomalous GVD. The spectral bandwidth of the pulse with steep edges is nearly constant during its circling in the cavity. However, the spectrum top exhibits sharp peaks near the edges after the pulse is amplified in the GF and then undergoes self-phase modulation in the followed DCF. Then the spectrum is reshaped by SA, DCF, GF, and SMF, successively, and evolves back to the near-flat top shape. Figure 2(b) shows the temporal phase shape evolution in the three kinds of fibers (DCF, GF and SMF). We see that there is only a small amount of phase shift induced by the short GF, which is effectively compensated by the other two kinds of fibers (DCF and SMF).

Bottom Line: Numerical simulation predicts the existence of stable 2 μm dissipative soliton solutions with pulse energy over 10 nJ, comparable to that achieved in the 1 μm and 1.5 μm regimes.Experimental operation confirms the validity of the proposal.These results will advance our understanding of mode-locked fiber lasers at different wavelengths and lay an important step in achieving high energy ultrafast laser pulses from anomalous dispersion gain media.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

ABSTRACT
While the recent discovered new mode-locking mechanism--dissipative soliton--has successfully improved the pulse energy of 1 μm and 1.5 μm fiber lasers to tens of nanojoules, it is still hard to scale the pulse energy at 2 μm due to the anomalous dispersion of the gain fiber. After analyzing the intracavity pulse dynamics, we propose that the gain fiber should be condensed to short lengths in order to generate high energy pulse at 2 μm. Numerical simulation predicts the existence of stable 2 μm dissipative soliton solutions with pulse energy over 10 nJ, comparable to that achieved in the 1 μm and 1.5 μm regimes. Experimental operation confirms the validity of the proposal. These results will advance our understanding of mode-locked fiber lasers at different wavelengths and lay an important step in achieving high energy ultrafast laser pulses from anomalous dispersion gain media.

No MeSH data available.


Related in: MedlinePlus