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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

Qualitative illustration of the amplitude and phase balances in a DS fiber laser at 2 μm, along with the 1 μm and 1.5 μm counterparts (insets).The red, green, and black arrows in the insets share the same meaning with the main figure.
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f3: Qualitative illustration of the amplitude and phase balances in a DS fiber laser at 2 μm, along with the 1 μm and 1.5 μm counterparts (insets).The red, green, and black arrows in the insets share the same meaning with the main figure.

Mentions: To gain deeper insight into the intracavity pulsing dynamics, a qualitative illustration for 2 μm DSs is summarized in Fig. 3, along with their 1 μm and 1.5 μm counterparts (insets)34. In the 1 μm and 1.5 μm spectral regions, the GFs (Yb-doped or Er-doped) have normal dispersion and introduce positive phase shift, which can be compensated by the negative phase shift provided by the SMF, even if the shift is relatively large (see the insets of Fig. 3). However, the scenario is quite different in the 2 μm wavelength regime, where the GFs (Tm-doped or Tm-Ho-codoped) provide anomalous dispersion and thus negative phase shift. To realize 2 μm ultrafast DSs, both DCF and SMF are necessary for dispersion management, and the net normal dispersion should not be too large. For a given 2 μm fiber laser cavity, the tolerance of phase shift left for the GF (Fig. 3) is limited to a relatively small phase limitation range (purple area). By increasing fiber length, the phase shift incurred by the DCF or SMF is small (yellow or green dashed arrow) while that induced by the GF is significant (red dashed arrow). The shorter GF (red arrow) has a larger slope and hence can achieve higher pulse energy within the phase limitation range. On the contrary, the longer GF (orange arrow), due to its smaller slope, has to sacrifice a large part of amplitude (and energy accordingly) to reduce its phase shift under the tolerable level. Therefore, pulses from a cavity with a longer GF have lower energies in this spectral region.


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)

Qualitative illustration of the amplitude and phase balances in a DS fiber laser at 2 μm, along with the 1 μm and 1.5 μm counterparts (insets).The red, green, and black arrows in the insets share the same meaning with the main figure.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Qualitative illustration of the amplitude and phase balances in a DS fiber laser at 2 μm, along with the 1 μm and 1.5 μm counterparts (insets).The red, green, and black arrows in the insets share the same meaning with the main figure.
Mentions: To gain deeper insight into the intracavity pulsing dynamics, a qualitative illustration for 2 μm DSs is summarized in Fig. 3, along with their 1 μm and 1.5 μm counterparts (insets)34. In the 1 μm and 1.5 μm spectral regions, the GFs (Yb-doped or Er-doped) have normal dispersion and introduce positive phase shift, which can be compensated by the negative phase shift provided by the SMF, even if the shift is relatively large (see the insets of Fig. 3). However, the scenario is quite different in the 2 μm wavelength regime, where the GFs (Tm-doped or Tm-Ho-codoped) provide anomalous dispersion and thus negative phase shift. To realize 2 μm ultrafast DSs, both DCF and SMF are necessary for dispersion management, and the net normal dispersion should not be too large. For a given 2 μm fiber laser cavity, the tolerance of phase shift left for the GF (Fig. 3) is limited to a relatively small phase limitation range (purple area). By increasing fiber length, the phase shift incurred by the DCF or SMF is small (yellow or green dashed arrow) while that induced by the GF is significant (red dashed arrow). The shorter GF (red arrow) has a larger slope and hence can achieve higher pulse energy within the phase limitation range. On the contrary, the longer GF (orange arrow), due to its smaller slope, has to sacrifice a large part of amplitude (and energy accordingly) to reduce its phase shift under the tolerable level. Therefore, pulses from a cavity with a longer GF have lower energies in this spectral region.

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